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Conus comatosa (Pilsbry, 1904)
Conus dormitor (Pilsbry, 1904)
Shell rather narrow and long, the diameter somewhat more than the length, the spire elevated, concave-sided, the length of the shell. The apex is broken off, 11 whorls remaining, the peripheral angle of each projecting above the suture. The last 24 are even at the periphery, but those preceding are nodulose. The concave, steeply sloping upper surface of each whorl is closely and regularly, finely costulate, the riblets arcuate, and decussated by several unequal spiral shallow grooves. The last whorl has almost straight lateral outlines, and is sculptured with closely punctate spiral grooves, very faint near the angle of the whorls, but becoming stronger and closer toward the base. The siphonal fasciole is closely spirally striate, not punctate. The aperture is long, natrow, and of equal width throughout (1).
Length 44, diam. 16 mm.; aperture 34 mm. Long (1).
Kikai, Osumi, in a deposit probably Pliocene. Types No. 85,950, A. N. S. P., from No. 1,552 of Mr. Hirase's collection (1).
This cone is related to C. acutangulus Lam., but is longer than that species. C. aculeiformis Rve. is similar in shape, but differs in sculpture. The specimens show no color (1).
In these Proceedings, p. 6, I described a Conus from Kikai-ga-shima as C. dormitor. My attention has been called by several friends to the prior use of this name for an Eocene species; and I would therefore call the Japanese form Conus comatosa. It is probably ancestral to the recent C. sieboldii Rve.
A Japanese fossil species, Conus comatosa Pilsbry (1904, p. 550) (originally named C. dormitor Pilsbry, 1904, p. 6) is also very close to the Cape San Lucas shell. It is from the Pliocene ("probably") of Kikai, Osumi and has no color as figured by Shuto (1961, p. 140, pi. 8, figs. 9, 10). Spiral sculpture is much stronger on this fossil than on either C. australis or C. emersoni(2).
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Biblografia
