618 Appendix to Part II. 



Stetjthiolaeia oexata. — PI. IV. fig. 62. 



Struthiolaria testa ovatd, apice acuminata, anfractibus senis, 

 spiraliter striatis, prope suturam canaliculatis, longitudinaliter 

 costatis, costis obtusis, antico costis duabus spiralibus, elevatis, 

 ante mediam positis ; suturd profunda : long. 0*7 ; lat. 045, 

 poll.' 



This is the only fossil species of this rare genus I have ever 

 seen. Casts of a large variety are found in a loose clayey sand- 

 stone at Port San Julian. M. d'Orbigny entertains some doubt 

 about this being a Struthiolaria. 



Santa Cruz and San Julian, Patagonia. 



Teitox yeret;ct;lost:s. — PI. IV. fig. 63. 



Triton testa ovato-conicd, transversim ienuiUr striatd, anfractibus 

 senis, 2JOsticis serie unicd mediand tuberculorum cinctis, ultimo 

 costis tribus subobsoletis tuberculiferis, tuberculis costce posticcB 

 majoribas, reliquiarum obsoletis ; varicibus validis, trituoerculi- 

 feris: long. 1*6 5 lat. 1*05, poll. 



This may be distinguished from Triton leueostoma (Ranella 

 leueostoma, Lam.), to which recent species it is most nearly 

 related, by the paucity of tubercles forming the posterior row, as 

 well as by the strongly tuberculated varices, and by its being 

 destitute of the pits which are so distinct behind the varices in that 

 species. 



Navidad, Chile. 



TfilTON LEUCOSTOttOIDES. — PI. IV. fig. 64. 



Triton testa ovato-oblongd, spird obtusd ; anfractibus senis, sub- 

 ventricosis spiraliter sulcatis, et longitudinaliter costatis; vari- 

 cibus sub-irregularibus, rotundatis, transversim sulcatis. 



This species resembles Triton leueostoma (Ranella leueostoma, 

 Lam.) more nearly than any other species : it differs, however, in 

 the following particulars, viz., in its general form, which is more 

 oblong ; in its longitudinal ribs, which are smaller and more 

 numerous, and extend nearly the whole length of each volution ; 

 whereas in T. leueostoma, they are little more than elongated 

 tubercles near the middle of the whorls. 



Huafo Island, coast of Chile. 



