Shell small for the genus, sculptured postnuclear whorls 5, suture impressed, periphery rounded, base weakly angulate, broadly umbilicate, columella with 1 prominent denticle at the termination of the bright green, flat cord bordering the umbilicus, another sharp denticle just below; aperture oblique, circular within, lip Urate within. Penultimate whorl with 7 narrow, sharp spiral cords, interspaces broader than the cords, not spirally striate. Base with 8 narrow cords, with broader interspaces, cords more broadly spaced toward the umbilicus. Spiral sculpture of fine growth lines, produced into fine microscopic lamellae just below the suture and on the interspaces between basal cords, particularly those close to the umbilicus. Color, mottled brown, tan and white, with alternating light and dark areas on the spiral cords of the body whorl and base. The broad spiral platform descending into the umbilicus is bright green, the umbilical wall smooth and white, the callus tongue is unusually narrow and is bright green. Height, 9.0, diameter. 11.8 mm.

Tegula verdispira is the only Eastern Pacific species having the spiral platform descending into the umbilicus. The same structure is found in the Caribbean species T. lividomaculata (C. B. Adams, 1845), but that is a much larger species lacking the green coloration in the umbilical area. Most of the known specimens of T. verdispira were mixed with lots of T. globulus, a smaller, more elevated species with weaker spiral cording. The single specimen from Los Frailes, Baja California, was mixed with specimens of T. corteziana sp. nov., from which T. verdispira is readily distinguished in lacking the pronounced spiral striae in the interspaces of the spiral cords. My own collecting at Los Frailes and nearby Pulmo Reef has yielded neither of the 2 new species, however. Another related species is the Caribbean T. maculostriata (C. B. Adams, 1845), which is known in the eastern Pacific only at Cocos Island, Costa Rica, where it was first reported by Pilsbry & Vanatta (1902, p 559). Although broadly umbilicate, it does not have an umbilical platform or groove, and has smoother spiral cords than T. verdispira. The name, meaning green spiral, directs attention to the most characteristic feature of this species.

Type Locality: South anchorage, Maria Magdalena Island, Tres Marias Islands, Mexico, 21° 35' N, 106° 35' W, in rocky area at low tide. The type lot, consisting of one mature and one juvenile specimen, was collected by James H. McLean, LACM station 65-11, 15 March 1965, from the R/V Sec
Quest.
Type Material: Holotype, LACM 1387; paratype, LACM 1388.
Referred Material: CAS 24108, Maria Magdalena Island, 4 specimens; CAS 23779, Maria Magdalena Island, 5-10 fathoms, 1 specimen; SDNHM 40044, Tres Marias Islands, 2 specimens; ANSP 142731, Maria Magdalena Island, 3 specimens; LACM A. 3991, Los Frailes, Baja California, 1 specimen.