NORTH AMERICAN CONCHOLOGY. 



409 



Page. 



31 Turritella acicula. 



31 Pyramis striatula. 



31 Odostomia exigua. 



31 Pleurotoma decussata. 



32 Cancellaria Couthouyi. 

 32 Fusus Islandicus. 



32 decemcostatus. 



32 Bamffius. 



32 rufus. 



32 harpularius. 



32 pygmasus. 



32 Rostellaria occidentalis. 



Page. 



32 Purpura lapillus. 



32 Trichotropis borealis. 



32 Buccinum plicosum. 



32 undatum. 



32 obsoletum. 



32 trivittatum. 



32 rosaceum. 



32 lunatum. 



32 Xylophaga cuneiformis. 



32 Helix hortensis. 



32 Turritella iuterrupta. 



CrOtild. — Catalogue of Shells collected in California by W. P. 

 Blake, with descriptions of the new species: by Augustus A. 

 Gould, M. D. (From Appendix to the Preliminary Geological 

 Report of William P. Blake, Geologist of the Survey in Cali- 

 fornia under the command of Lieut. R. S. Williamson. Wash- 

 ington, 1855.) 



[Though referred to House Document 129, I canuot find it in the Con- 

 gressional Reports. It seems to have been published separately in this 

 octavo form. It occurred subsequently in quarto, with plates, in the 

 Pacific Railroad Report, vol. v, q. v. — W. G. B.J 



