Appendix to Part II 621 



anterior; it nearly resembles in general appearance the fossil 

 Volutes, muricina, Lam., and angusta, Desh., though easily distin- 

 guishable from both, by the circumstance of the three folds on the 

 columella being very nearly equal in our species, whereas in the 

 two above mentioned the posterior folds are more numerous and 

 all very much smaller than the anterior : moreover, the posterior 

 part of the volutions is not adpressed in either of those species, 

 and the proportions are also different. 



Navidad, Chile. 



VOLUTA ALTA. — PI. IV. fig. 75. 



Voluta testa elongato-oblongd, spird attenuatd, anfractibus senis 

 gracilibus, spiralite?' confertim striatis, prope suturas adpressis, 

 deinde subventricosis ; aperturd oblongd, labio externo crassiori, 

 subreflexo ; columella lcevi,plicis duabus acutiusculis, perobliquis : 

 long. 7 '5 'y lat. 2'75, poll, circa. 



There is only one specimen of this very remarkable shell, of 

 which the anterior part is so imperfect, that no part of the inner 

 lip or of the canal is to be seen, consequently the proportions 

 given above may be liable to a slight error. The species is nearer 

 to V. Magellanica, than to any other known species ; it may, 

 however, easily be distinguished from that species by the 

 characters above stated. At Santa Cruz, there are two casts, 

 apparently belonging to this species, but considered by M. 

 d'Orbigny as different. 



Navidad, Chile ; Santa Cruz, Patagonia ? 



Oliva dimidiata. — PI. IV. figs. 76, 77. 



Olivz testa oblongo-ovatd, spird acuminata, apice obtuso; anfractibus 

 senis, ultimo lined tenuissimd transversim dimidiato ; columella 

 antice plicis quinque obliquis, posticd majori: long. 0"9 j lat. 

 0-37, poll. 



This species varies in its proportions ; it differs from all other 

 recent or fossil species with which I am acquainted, in the remark- 

 able circumstance of its having a broad band of enamel covering 

 the anterior half of the last volution above or behind the 

 columellar band, which is distinguished from the posterior part of 

 the volution by a very fine line, behind which may be seen the 

 longitudinal lines of growth, these lines being hidden on the 

 anterior part by this last coverng of enamel. This species bears 

 a general resemblance to O. ispidula, a common recent species. 



Navidad, Chile. 



