MOLLUSCA OF THE ' CHALLENGEK ' EXPEDITION. 611 



on the last there are above the periphery about four larger, with 

 smaller ones between, while on the base they are numerous, both 

 without and within the umbilicus ; one in particular in the middle 

 of the base is strong, and another, within the funnel, is nearly 

 as much so ; these spirals are faintly crossed by the longitudinal 

 lamellae ; but within the umbilicus the lamella; form minute spines 

 or tubercles on the crests of the spirals. Colour a cindery 

 yellow with a ruddy tinge, and flecked above, especially on the 

 highest spiral, with brilliant little crimson spots*; the upper 

 part of the spire is bright yellow, the apex pale. Spire depressed, 

 conical, scalar. Apex rounded, polished, the tip scarcely promi- 

 nent ; the embryonic tip seems, as usual, introverted. Whorls 5? 

 of very gradual and regular increase, with a flat, horizontal or 

 slightly sunken shoulder below the suture. Suture distinct, 

 being angulated and a very little impressed. Month round, very 

 oblique, small. Outer Up thin, very slightly patulous, with a very 

 feeble white callus within. Inner Up has a very short attachment 

 to the body, is rounded, and a little patulous. H. 0"16. B. 024. 

 Penultimate whorl, breadth 005, Mouth, height 0'09, breadth 

 009. 



This very pretty little species is not like any other I know, 

 and rather recalls in form some of the Solariella group of Tro- 

 chus ; but the mouth, inner lip, texture of shell, and apex are 

 unmistakably those of Solarium. There are in this specimen, on 

 the last whorl especially, some minute stumpy setse, which are 

 probably embryonic seaweed. They are too irregularly ar- 

 ranged to make it likely they should be traces of any epidermis. 



* These suggested the name. 



