320 SOLARfELLA. 



The beautiful species, of very singular aspect, recalls in a very 

 general way the form of Turcica monilifera, A. Ad., but differs from 

 that in its rounded contours, strongly contracted suture, umbilicus, 

 and straight untoothed pillar. It resembles in form Margarita 

 aspecta, A. Ad., but that is less tumid, is carinated, its umbilicus is 

 much smaller, the spirals are many more, and they are not tubercled. 

 It is very like Trochus ottoi Phil., a fossil from Messina, lately 

 taken alive in abundance by Professor Verrill off the New England 

 coast in 115 to 500 fathoms, and published by him as Margarita 

 regalis. Trochus infundibulum may, after all, be only a variety, 

 but compared to that this is larger, higher in proportion to breadth, 

 has the base much more tumid, and the longitudinals far weaker. 

 In Trochus ottoi Phil., these longitudinals are very strong, and 

 make sharper, higher, crisper nodules on the spirals; that species, 

 too, has not the subsutural flat with its radiating bars and its border 

 of tubercles, and has not the spiral uniting that first row of tubercles. 

 As to the infra-umbilical spirals they vary astonishingly. ( Watson.) 



Off Bermuda, 1075 fins.; Marion Id., Indian O., 1375 fins.; Off 

 Guadalupe, 769 fms. 



Tr. (Margarita) infundibulum WATSON, Jotirn. Linn. Soc. Lond., 

 xiv, p. 707, 1879; Challenger Rep., p. 84, t. 5, f. 5. Solar iella in- 

 fundibulum Watson, DALL, Blake Gasterop., Bull. M. C. Z. xviii, p. 

 380, 1889 ; The Nautilus, 1889, p. 1. (Anatomy.) 



The external anatomv and genitalia have been described by Dall. 



8. OTTOI Philippi. PL 57, fig. 17. 



Shell rather large for the genus, thin and delicate, whitish, 

 brilliantly iridescent or pearly, externally and internally, broad 

 conical, turreted, wider than high, with a convex base, and deep 

 umbilicus. Whorls seven, much flattened, with the suture scarcely 

 impressed ; the upper whorls are coronated by two, and the body- 

 whorl by three, revolving, strongly nodulous ribs, along which the 

 conical, often acute nodules are very regularly arranged. The first 

 of these rows of nodules is just below the suture ; the second is 

 separated from the first by a wide, flat, or slightly concave interspace ; 

 the third is not far from the second, and surrounds the periphery, 

 usually corresponding with the line of the suture ; the second and 

 third are usually the most elevated ; on the base there are five or six 

 strong, rounded, revolving ribs, part of them usually somewhat 

 nodulous, separated by deep, concave interspaces, rather wider than 



