260 PYRAMIDELLlDiE. 



Animal resembling that of Chemnitzia in all its principal 

 features. 



The mollusks which we have retained under this genus, 

 are easily distinguished from the Chemnitzice by the struc- 

 ture and aspect of their shells. Certainly they form a 

 natural group, though whether we should consider it as 

 more than a section may fairly be questioned. The species 

 are difficult to distinguish and very critical ; from their 

 similarity it is not always easy to determine them at the 

 time of capture ; consequently our notes on their animals, 

 drawn up entirely before the elaborate investigation of 

 their shells by Mr. Jeffreys, are not available with cer- 

 tainty. This defect, however, we are enabled to remedy 

 so far as some of the most important species are concerned, 

 through the kindness of Mr, Clark, who has directed his 

 attention to them especially during this summer of 1850, 

 and has favoured us with several valuable descriptions, 

 which we insert at their proper places. 



As yet it is unsafe to speak positively with regard to 

 the range in the European or other seas of the greater 

 number of Odostomm ; hence references to foreign distri- 

 bution are seldom made under this genus. Several species, 

 however, have been described as taken in the Red Sea, 

 and we ourselves have many undescribed ones from 

 Australia. 



O. coNoiDEA, Brocchi. 



Ivory-white, conical, smooth, solid : whorls more or less flat- 

 tened j suture canaliculated ; throat spirally lyrated. 



Plate XCV. fig. 4. 



Tiu-ho coiioideus, Brocchi. Conch, vol. ii. p. G()0, pi. 16, f. 2. 



Auricula conoidea, Ferus. Tableau Syst. Moll. p. 104 (from last, name only). 



Auricula ? couoideu, Philippi, Moll. Sicil. vol, i. p. 143 ; vol, ii. p. 119. 



