Conus pseudosulcatus      (Nomura, 1935)


Shell of medium size, elongate-conic; test moderate in thickness. Spire conical, rather high, slightly concave in lateral outline, with pointed apex. Whorls about 12, apical 2 embryonal, smooth and globular; succeeding 2 also globular; others regularly increasing, and slightly shouldered; angle of shoulder somewhat projecting immediately above suture, surface above it concave and furnished with 4-6, subequal revolving threads, interspaces wider and provided with a few unequal spiral threads. Angle indistinctly granulate on upper whorls and broadly undulate on lower, forming distant, elongate nodules on periphery. Suture impressed, and also undulate. Body-whorl below peripheral angle nearly straight or slightly convex in side view, ornamented with about 20 subequal revolving cords which are beautifully punctate in aged speci-mens; entire surface covered by numerous, fine growth lines which are marked best in grooves of body-whorls. Aperture narrow, slightly wider in lower part truncated at base. Height, 50 mm.; diameter, 23 mm. (1)

This species closely resembles C. sulcatus HAWASS living in Chinese waters but is distinguished by grooves on body-whorl being wider than cords (1)

C. ornatissimus MARTIN mentioned below is also related to the present species, but that species is somewhat narrower and has more numerous spiral grooves and cords (more than 30) on body-whorl (1).

C. sulcatus of TESCH is a varietal or at least subspecifically different from the present new species; the two differ slightly in form (1).

Fossil occurrence: Byôritu Beds. - 700 m. NE. of Nanseizan: station 19; Reg. No. 52335 (1).

Wangwa: station 24; Reg. No. 52336. Wangwa: station 34; Reg. No. 52334 (1).

Geologic distribution: Pliocene of Java (1).
Conus pseudosulcatus
mm. 57,5
Pliocene
Jampang Regency
Conus pseudosulcatus
Plate VII fig. 3 (1)
mm. 50 x 23







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