152 BULLETIN OF THE 



A young specimen, of the same age as the young S.junonia before descrihed, 

 presented the following characters. 



Colors. — Nucleus and first turn purplish brown (this fades with wear and 

 exposure to an orange or buff) ; ground color pale salmon, or like the inside 

 of a ripe canteloupe melon ; spots smaller, more angular, and more uniform 

 than in S.junonia, and arranged in six series; the peripheral series had twelve 

 spots, in S. junonia only nine ; pillar like the basal color. 



Sculpture. — The nucleus, larger than the next turn, is finely granulous as in 

 junonia, but is shaped like Natica mamilla ; the initial point is a point, dis- 

 tinctly elevated above the rest. When its original surface is worn away, the 

 hard core with which it is filled forms a sharper and more elevated point than 

 there was originally. The spiral striation is uniform ; the whorls are com- 

 pressed in front of the suture ; the ribs therefore, which do not become obsolete 

 as soon as in S. junonia, have their shoulders some distance in front of, instead 

 of at, the suture, as in that species ; there are seventeen of them on the last turn, 

 and they become obsolete immediately in front of the periphery as a rule ; the 

 epidermis, smooth in the adult, is distinctly hispid in the young; there are 

 two clear cut but small plaits on the remarkably straight columella at its pos- 

 terior end. The shell is 32.0 mm. long, the last whorl, 27.0 mm., and the 

 maximum diameter, 12.0 mm. In an adult of 90.0 mm. long, the maximum 

 diameter is 25.0 mm. 



A very good figure of this species is that (fig. 5) given by Tuomey and 

 Holmes, above cited. It represents a specimen from the Post Pliocene beds of 

 the Peedee River, S. C. Casts are said to be abundant in the marl of Goose 

 Creek. Neither of the figures on this plate represents the typical S. mutabilis, 

 as they differ remarkably from Conrad's original figure. 



Two specimens of this species were obtained in a living state at Station 2402, 

 by the U. S. Fish Commission, but were not discovered in the alcoholic col- 

 lection until after the preceding and succeeding remarks on this family had 

 been some time concluded. They were both males, and afforded the following 

 notes. 



The animal is of a pinkish white color, the anterior parts more orange or 

 reddish, the sides granular, with stellate black markings, and a certain amount 

 of dark pigment aggregated toward the tip of the proboscis, siphonal fold, and 

 margin of the foot. The foot is somewhat auriculated at its anterior comers, 

 double across its front edge, and folded longitudinally. The tentacles are 

 large with acute tips, and their bases, laterally angulated, continuous with 

 the veil and not notched, are separated in the median line by a deep sulcus. 

 The eyes are small and black, on small pretty well differentiated peduncles, 

 outside of and behind the bases of the tentacles. There are two well-developed 

 gills, and, on the opposite side, on the dome of the mantle, a large transversely 

 corrugated slime-gland. The anus is in the nuchal commissure and incon- 

 spicuous. The penis is not sickle-shaped, but small, subrectangular, with an 

 inconspicuous lateral tip, the whole laid back on the neck and pointing 

 caudally. There is a small squarish appendicle to the siphonal fold which 



