Gemmula rarimaculata: Shell of moderate size, slender fusiform, not very thick, white with brown blotches on the peripheral keel and others. Spire high and conic. Protoconch polygyrate conic, with blunt apex, smooth other than last one and a half volution with axials. Peripheral keel with granules and subsutural band appear from the youngest teleconch whorl, and they are divided by a groove. The granules on the peripheral keel are cut by the groove. Spiral cords develop both sides of the keel by age, and finer secondary cord is to be seen between primary cords on the base. Axial threads are weak and indistinct. Last whorl high with comparative long siphonal canal. Aperture long, with an U-shaped anal notch at the end of the peripheral keel. Outer lip thin, producing between anal notch and canal. Stromboid notch lacking. Height 22.6 mm and breadth 7.1 mm

Gemmula rarimaculata: Diagnosis: Shell length about 2-3 cm, aperture 0,37-0,44 of total length; sutures narrowly channelled; subsutural cord tumid, more or less equal in strength to peripheral cord, bicarinate; shoulder sulcus narrow and sometimes channel-like; peripheral cord with 26-33 close-set, bifid gemmae, their intervals with 2-3 distinct spiral threads; basal periphery of body whorl with 3-4 cords, base as in gilchristi but with finer, more numerous lirae. White, peripheral and subsutural cords marked with orange-brown. Protoconch diameter 1,25 mm. Rachidian plate of radula transversely rectangular with sharp mesocone and raised anterolateral corners.
Description (local material): Shell with.aperture 0,37-0,44 of total length; spire slightly cyrtoconic, sutures narrowly channelled; about 8 teleoconch whorls. Subsutural cord tumid, usually as strong as peripheral cord, bicarinate, with a thin, finely crenulate, somewhat cristate thread at suture and an angular main ridge. Gemmae on peripheral cord slightly prosocline, bifid, close-set, 26-33 on penultimate whorl, intervals with two rather strong spiral threads. Shoulder sulcus narrow, sometimes canaliculate, with 2-4 threads. Body whorl with 3-4 cords on basal periphery, separated by fine intermediaries, and several more separate them from the basal series of weaker and stronger lirae; rostrum with numerous very fine spiral threads. Growth striae strong, sometimes forming fine axial pliculcs.
White, shoulder cord generally stained with light brown or brownish-orange, sometimes forming large, irregular blotches, subsutural cord often tinged with brown. Protoconch pupoid-conical, 4-5 whorls, glossy yellowish; last three whorls with arcuate axial ribs, numbering about 22 on last whorl; maximum diameter 1,25 mm. Dimensions: 27,7 x 9,3 mm; 26,3 x 8,2 mm; 18 x 6,2 mm. Radula: Rachidian plates transversely rectangular with sharp mesocone and corners of cutting edge raised into weak side cusps.

Gemmula rarimaculata: This species is characterized by brown blotches on the white ground. It is close to Gemmula vagata (SMITH), but the latter differs from the former by having broader shell with more abapically situated peripheral keel.

Kilburn:
G. rarimaculata can easily be confused with G. gilchristi, which inhabits somewhat similar depths (90-200 m) but appears to prefer substrata of fine sand or mud, whereas rarimaculata is usually found on coarse sand and rubble. Although attaining a larger adult size, G. gilchristi has a characteristically smaller protoconch (diameter 1 mm or less); it also lacks conspicuous brown markings and has a weaker subsutural cord and wider sulcus.

Gemmula rarimaculata: Type locality: Sagami Bay
Localities:Koronbane (110-140 m) : Amadaiba (120-150 m); Amadaiba-Kannontsukadashi (67-73m); Kannontsukadashi-Maruyamadashi (67-74 m)
Distribution:Honshu. On sandy bottom of 60 150 m deep

Kilburn: Japan to Transkei.