As Galeoastraea formosana Shikama, 1977:
Description: Shell small sized, trochoid with 4 volutions of teleoconch. Suture shallow. There is a distinct edge between base and shoulder of whorl. Last whorl has 6-9 spiral ridges which are nodulous. Edge carries sharp tubercles which are trigonal, projected exterio-downward and overlapped surface of suceeding whorl. Shoulder of whorl gently curved. Surface of whorl light violetish brown with irregular blotches of brownish black colouration. Base of whorl also has axial blotches of brownish black colouration. Callus thin while columella thick, white and twisted. Aperture suboval with nacreous inner surface. Outer lip thin.
Holotype: Shell 24.8mm high and 26.2mm wide, stored in the writer's collection, offered by NAKAYASU. Locality: Off Taiwan.
Remarks: This species is rather near persica DALL or asteriana DALL but is distinct by axial colour blotches of base and by colour blotches on shoulder of last whorl. Peripheral tubercles of last whorl of this species is less than in the both species, while spiral ridges of whorl have more nodules in this species than in them.

DIAGNOSIS. Shell: Whorls slightly convex, sutures weakly to moderately channelled, spines rather long for species, sculpture of moderately strong, gemmate spiral cords. Peripheral angle sharp on early whorls, slightly overhanging later whorls. Periphery bluntly angled on body whorl, with about 22-28 hollow, rather short, slightly downwardly directed spines on body whorl. Basal angle distinct, granulate, the space between basal and peripheral angles flat, with 1 weakly gemmate spiral thread. Base with 6 weakly gemmate threads, becoming stronger towards the columella. Upper surface of whorls with a moderately strong row of granules a little below the suture, followed by 5-7 gemmate spirals on penultimate whorl, 6-8 on body whorl. Basal callus very thin, white near columella, remainder transparent, separated from columella by a groove, extending over about 16 of base. Surface pinkish-fawn, with purplish-brown blotches on upper surface. Outer lip reflected when mature. Operculum: Oval, almost circular, with steep concentrically striated sides and flattened pustulose central area. Central area higher opposite nucleus than above nucleus.
DIMENSIONS. Holotype: height 23.5 mm, diameter 26.5 mm (Dr. T. Habe, in litt.); paratype: height 40.0 mm, diameter 41.9 mm (Dr. T. Habe, in litt.). Figured specimens: height 29.5 mm, diameter 31.3 mm; height 41.0 mm diameter 39.1 mm; large specimen: height 46.3 mm, diameter 44.2 mm.
TYPE LOCALITY. Tosa Bay, Shikoku, Japan, ca. 100 m (Dr. T. Habe, in litt). TYPES. NSMT, 59903; single paratype, NSMT, 59904.
OTHER LOCALITIES. Japan: Southern part of Honshu and Shikoku in 91-146 m (Kira, 1962, p. 18); Tosa Bay, Shikoku (Oyama & Takemura, 1960: Bolma pi. 1). The subspecies does not overlap the geographic range of B. guttata guttata (A. Adams), which occurs further north around Sagami Bay.
Bolma guttata millegranosa differs from B. guttata guttata in its finer sculpture of more numerous rows of gemmae, in having a flattened, steep-sided rather than convex operculum and in its longer spines; from B. guttata bathyraphis in its more inflated whorls, its slightly coarser sculpture and its downwardly directed peripheral spines, and from B. persica (Dall) in its coarser gemmae, its much shorter peripheral spines, and its more inflated whorls. The eastern Australian specimens agree in nearly every respect with Japanese material and it is surprising that no other records from the rest of the western Pacific are available.
As with several other species of Japanese molluscs, the manuscript name millegranosa of Kuroda and Habe was first introduced as a nomen nudum when it was published by Kira (1955, p. 20) as no statement was given to differentiate the taxon (International Code of Zoological Nomenclature, Art. 13a). As Habe (1958, p. 45) was the first to associate a statement of differentiation with the name (International Code of Zoological Nomenclature, Art. 24b) when he distinguished the radula from that of Bolma modesta (Reeve) and as he attributed the name to Kuroda & Habe, we agree with Dr. Habe {in litt., 8 Nov. 1975) that the name should be attributed to Kuroda & Habe in Habe (1958, p. 45). Dr. Habe has noted that the holotype (details above) is the specimen from which his illustrated radula was removed.