, I. SMITH. f.7 



Hist, IK47, vol. XX, p. 2(>S. The circulation of" more tha ic copy of the Proofs" 



(Gray*) of 116 pages of his posthumous work, " Moll. Brit. Synopsis," about the year 

 1820. docs not constitute publication. These names, therefore, cannot date earlier than 

 1S47. In the meantime, in I s:'.0, .Menkef had limited the name Laniellaria to the 

 second section of that genus, and therefore undoubtedly it should lie employed instead 

 of Mitrxi'iiiii. 



19. Trichotropis <uit<i/-<-h<-<i, Tliielc. PI. I. tig. <. 



Tiii-lwtropis tnilan-lii-ii, Tliicle, lleutsrhe Siidpolur-KxpL'il., vol. XIII, p. 1117, pi. XII, ti^'. 6 ; 

 pi. XV, 11-. 1>1, ri i(lulii(l!ll-J). 



Station 355 : 300 fathoms. 



A single specimen, much larger than the shell dcserilied hy Thiele, which was 

 probably young. It is 8'5 mm. in its greater diameter, and 7 '75 in height. 

 The soft, thick periostracum is very remarkable, forming a close, spine-like coronation 

 upon the spiral ridges. The form of the aperture in this more adult .specimen is 

 rounded and not quite so much produced as shown in Thicle's figure. In a youuger 

 .shell the form would, I think, lie as depicted liy him. 



20. Trichotropis planispira, n. sp. PI. I, fig. 7. 



Shell depressed, orliicular, Hat above, rather widely umbilicated, with three thick 

 keels upon the body-whorl, clothed with a thick, soft, dirty white periostracum, except 

 upon the two white apical whorls: volutions three, very rapidly enlarging, the first a 

 little rounded, the rest flat above, separated by a channeled suture ; last whorl with a 

 strong keel at the shoulder, and a similar one at the periphery, bordering the base, 

 upon which is the third carina ; the periostracum consists of closely packed threads of 

 growth ; aperture subcircular, white within ; peristome waved by the ends of the three 

 carimB, expanded, subcontinuous, the columellar margin united above to the outer lip 

 by a thin callus. Greater diameter '.) mm., height 5 ' 5. The operculum is triangular, 

 and is composed of fine curvet] lines of growth, the nucleus being terminal, as 

 represented by the tig. C.A on plate XXIX of Adams' " Genera of Mollusca." 



Station :!14: 222-241 fathoms. 



This remarkable species, of which only one specimen was obtained, dillei-s in its 

 depressed orbicular shape from all other known forms of Tri<-litri>ix, and rather calls 

 to mind the general aspect of Lippistes. 



Tr/r/infri'/iix usually exhibits a verv slight notch or rudimentary canal at the base 

 of the columella. but this feature is scarcely indicated in the present species. The 

 rather large umbilicus is not peculiar, since '/'. //<>//<// is also openly umbilicated, 

 whilst, on the contrary, some other species are imperforate. 



* Synopsis Moll. Gt. Brit, by Lc.-idi, Is.",:.', preface. 

 f Syii"| sis mctliiiil. Mull. C'l ;tltcT.-l IS.'!!), p. ST. 



