Appendix to Part II. 615 



T. ambulacrum it is the least prominent. The ribs in the latter 

 species are but slightly granose, and the groove at the suture is 

 deeper. 



Huafo and Mocha Islands, coast of Chile. 



TlJEEITELLA SUTUEALIS. — PI. III. fig. 50. 



Turritella testa turritd, tenuiter transversim striatd, anfractibus 

 9-10, suturd validd divisis, antice posticeque tumidiusculis,postice 

 eminentiore. 



Fragments alone can be separated from the hard stone in which 

 they are imbedded ; it has therefore been impossible to give the 

 proportions. 



Navidad, Chile ; and Ypun Island, Chonos Archipelago. 



Pletjeotoma stjbjeqtjalis. — PI. IV. fig. 52. 



Pleurotoma testa oblongd, turritd, utrdque extremitate acuminata, 

 anticd breviori; anfractibus senis, medio cariniferis, carina 

 tuberculiferd ; ultimo anfractu carinis quinque, posticali tuber- 

 calif era : long. 0'6 ; lat. - 25. 



The species which most nearly resembles this is an undescribed 

 recent species from S. America : this fossil species differs however 

 from the recent one in the position of the notch in the outer lip, 

 which in the fossil corresponds with the posterior tuberculiferous 

 carina, while in the recent one the notch is placed halfway between 

 the posterior tuberculiferous carina and the suture. There are 

 other marks of difference, but this may be considered sufficient, as 

 forming at once a distinct criterion. 



Huafo Island, coast of Chile. 



Pletjeotoma TUEBra-ELLOiDES. — PI. IV. fig. 53. 



Pleurotoma testa oblongd, subventricosd, transversim tenuissimb 

 muricato-striatd, anfractibus quinis, ventricosis, infra mediam 

 tuberculatis, tuberculis acuminatis, ultimo antice lineis quatuor 

 vel quinque obsolete tuberculatis ; canalibrevi: long. 1*35; lat. 

 0-82, poll. 



Very different from any other known Pleurotoma, either recent 

 or fossil ; but most nearly allied, in shape particularly, to the recent 

 Bpecies named PI. imperialis by Lamarck. 



Navidad, Chile. 



