346 CALLIOSTOMA. 



are seven rows of appressed beads of nearly equal width and dis- 

 tance from one another ; the first joins the outer lip, the central 

 row twines up the pillar. These rows of beads make their appearance 

 on the second whorl, and on all the upper whorls more than on the 

 body-whorl ; the carina is sharply expressed by a constriction above 

 and below it. Longitudinals the whole surface is crossed obliquely 

 by not quite contiguous threads, which are almost as strong as the 

 spirals. Between the threads arc narrow, deep, long pits; each 

 alternate thread is crowned by a bead at the suture. Color : the 

 surface is dull and rough, yellowish, sparsely spotted on the spirals 

 with a ruddy brown, which is almost crimson on the infra-sutural 

 beads. Spire high and conical, the whorls being barely rounded. 

 Apex small but flattened, the embryonic 1.1 whorls scarcely pro- 

 jecting. Whorls 7, of regular increase, almost flat, the body-whorl 

 alone being slightly convex, rounded, and carinated at the periph- 

 ery and tumid on the base, in the center of which is a most minute 

 umbilical chink. Suture deeply and squarely impressed below the 

 carina. Mouth slightly oblique, squarish, nacreous. Outer lip 

 very thin, very slightly descending, and drawn in a little horizon- 

 tally at its junction with the body, and then well rounded in its 

 whole sw r eep to the point of the pillar-lip, near which it is externally 

 crenulated by the ends of the basal threads. Pillar is short, 

 straight, slightly tubercled on its inner side, hardly toothed in front, 

 and still less angulated at its junction with the outer lip. The 

 pillar-lip is very thin, slightly excavated longitudinally, and re- 

 verted on the minute umbilicus, which it almost wholly conceals. 

 Behind it is a very narrow furrow. 

 Alt. -27 ; diam. -22 inch. ( Watson.') 



Philippines, in 82 fms. 



Troclius (Ziziphinus*) transenna, WATSON, Journ. Linn. Soc. Lon- 

 don, vol. 14, p. 698 ; Challenger Rep. Gasterop., p. 62, t. 6, f. 3. 



In form and details of sculpture this species is extremely like 

 Trochus (Thalotia) elisa, Gould, from island of Capul, in the 

 Philippines (British Museum), but is very obviously different. 

 ( Watson.') 



C. ARGENTEONITENS Lischke. PI. 63, figs. 32. 



Shell imperforate, coiioidal, apex acute, thin, yellowish, beautifully 

 iridescent, the underlying nacre shining through ; whorls 8, a little 

 convex, obsoletely sculptured with incremental strise ; suture with a 



