Appendix to Part II. 6 1 1 



Ckepidtjla gkegakea. — PI. III. fig. 34. 



Crepidula testa oblongd, intortd, crassd, subrugosd ; septo elongato, 

 subspirali, Icevi ; vertice submarginali. 



This species is remarkable for its lengthened form : it is found 

 grouped together in an argillaceous sandstone of a grayish colour. 

 It bears a strong general resemblance to Crepidula fornicata, 

 which is found, similarly grouped, on the coast of New York, 

 New England, and generally on the Atlantic coasts of North 

 America. 



Santa Cruz, Patagonia. 



Bulla cosmophila. — PI. III. fig. 35. 



Bulla testa subcylindraced ; extremitatihus obtusis, rotundatis, 

 anticd paululum latiore; striis numerosis, confertis, trans- 

 fer sis, inter stitiis angustioribus planiusculis: long. 0"9; lat. 0*4. 



I do not find any character to distinguish this from the fossil 

 which abounds in the neighbourhood of Bordeaux, and which is 

 also found near Paris and in Normandy, and which Deshayes has 

 regarded as merely a variety of Bulla lignaria, Auct., from which 

 however it may easily be distinguished by its much more cylindri- 

 cal form. 



Huafo Island, Chile. 



SlGAKETTJS STJBGLOBOSTTS. — PI. III. figs. 36, 37. 



Sigaretus testa subglobosd, anfractibus quatuor, spiraliter concinnb 

 sulcatis : long. 09 ; lat. OS ; alt. 0*55, poll. 



The spiral grooves and intermediate ridges are very nearly 

 equal in general, though sometimes rather irregular. This is the 

 most concave species of Adanson's Sigaretus that I have ever seen, 

 the position of its aperture being much less inclined to the longi- 

 tudinal axis than it is even in the S. concavus, Lam., a recent 

 species common at Valparaiso. 



Navidad, Chile ; and Ypun Island, Chonos Archipelago. 



Natica petola. — PI. III. fig. 38. 



Natica testa ovato-subglobosd, glabra, anfractibus quatuor, umbilico 

 magno, patulo. 



A single individual of this small species, which appears as far 

 as I can judge to be distinct from any of the recent species, occurs 



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