Appendix to Part II 619 



Cassis mo^ilifek. — PI. IV. fig. 65. 



Cassis testa subglobosd, transv&rshn tenuiter striata, spird eleva- 

 tiusculd, anfractibus senis, ultimo gibboso, serie unicd tuber~ 

 culorum postice instructo ; labio externo tenuiusculo, rejlexo, 

 intus Icevi ; labio columellari expanso, Icevi : long. 1*5 ; lot. 1*1, 

 poll. 



A second row of small tubercles may be observed occasionally. 

 I know of no species to which this is nearly related. 



Navidad, Chile. 



MOXOCEEOS AMBIGTJTJS. — PI. TV. figS. 66, 67. 



Monoceros testa subglobosd, c?'assiusculd, lcsviusculd,spiraliter obsolete 

 costellatd, aperturd magna, labio externo intus incrassato, 

 mnbilico parvo, angusto. 



A single specimen in very bad condition ; considered by 

 M. d'Orbigny as. closely related to, but not identical with, the 

 M. crassilabrum of Lamarck. 



Coquimbo, Chile. 



Gasteiditjm. 1 — Novum Genus. 



I have thought it necessary to designate this singular shell by 

 a new generic name, because its characters are such as will not 

 permit its union with any hitherto established genus. The shells 

 to which it appears to be most nearly allied have hitherto been 

 arranged with Buccinum, Eburna, and Fusus. Such is the Bucc. 

 plumbeum of Chemnitz (which Swainson has designated by the 

 generic name of Pseudoliva 2 ), and which, to avoid the necessity of 

 adding to the number of generic names, I had united to the 

 JEburnce. 3 Such also are two fossil shells described and figured by 

 Deshayes, under the names of Buccinum Tiara and B.Jissuratum. 

 One shell resembles this somewhat in form, but in other respects 

 is very different, and this has been placed with the Buccina in 

 Wood's ' Suppt.,' and with the Fusi by Gray. The characters by 



1 From yaarpidiov, ventriculus. 



2 This name of Pseudoliva, by which Swainson has designated the 

 Buccinum plumbeum of Chemnitz, and which has been adopted by 

 Gray, is evidently untenable and absurd, because employed to describe 

 an imaginary affinity to Oliva, which does not exist. To Eburna and 

 Buccinum, Lam., the genus is nearly related. 



3 Deshayes, < Coquilles fossiles des environs de Paris,' torn. ii. pp. 

 655, 656. 



