Seguenzia cervola Dall, 1919

(Figure 2 A–B)

Seguenzia cervola Dall, 1919: 344 . Holotype USNM 209229. Off North Coronado Island, Baja California, 618–692 fms [= 1130–1265 m].

Seguenzia megaloconcha Rokop, 1972: 15, fig. 1. Holotype USNM 701260. SW of Farallon Islands, W of Pioneer Seamount, 3592–3798 m. New synonym.

Description. Shell to 10 mm, globular inflated, suture little impressed; spiral cords decreasing in strength from shoulder to base, one below suture, one on mid-shoulder, more than one dozen from periphery to base; crossed by finest axial lines; umbilicus open, bordered by more or less distinct periumbilical cord, partially covered by umbilical chink, funiculus present; columellar wall thickened, abruptly ending.

Distribution. Oregon (46˚N) to Coronado Islands, Baja Califonia (32˚N). 1100–3800 m.

Remarks. Seguenzia megaloconcha is a small specimen of S. cervola as shown by the identical sculpture on the earlier portion of the teleoconch and the shared umbilical characters.