ficalion, was listwi niKler tlic above name. Tlmt the S'llitary ■Nluzatlan sliell 

 reFerrcd to is identical with the Wist Indian, is hinlily improbable. 



The highest northern station on the west coast of America at which any rep- 

 resentative of the PorceUanidiB (Cyprreida;) has been detected, is the rocky point 

 known as Bodega Head, some fifty miles norlli of the entrance to San Fran- 

 cisco Bay, in latitude about 38 '^ north. This is one hundred and forty 

 miles farther north - than the species ( I'rivia Californica or any other related 

 form) has been reported prior to my Bodega collection in June 1867. 



Passing to the Amphiperasida? — the catalogue of wliicli is published in con- 

 nection with the Porcellanidtx? — it will not be irrelevant to direct attention to 

 the paper of Professor Gill "On the Relation-^ of the Amphiperasida?," publisheci 

 in the Am. Jour, of Conch., Vol. VI, pp. 183-187. The marked difference in 

 the form and plan of structure of the shells of this family, with the exception 

 of A. ovum (which, in a general way, resembles Cypraia) as well as the ana- 

 tomical differences indicated by Professor Gill, require that the forms included 

 in the catalogue referred to should be removed Irom a consecutive classifica- 

 tion. That they more nearly approach the form known as Pedicularia is 

 readily seen. As the shells of the latter are rare in collections, and are quite 

 important to the student in this connection, I would suggest an examination 

 of the red and purple corals of the Indo-Pacific waters, upon which, by care- 

 ful scrutiny, specimens may frequently be found, of the same color as the coral 

 to which they are attached. 



7. Volva avena, Sov^b.. 'Santa Barbara— Panama,'' has never been confirmed 

 so far north as Santa Barbara. 



3G. V. variabilis, C. B. Ad., " Cape St. Lucas," has a more northern limit, 

 having been collected at San Pedro, California, by Dr. Cooper, and Carpenter 

 credits it to Santa Barbara, ("Jewett.") I am inclined to believe that V. 

 avena = V. neglecta of C. B. Ad., Mr. Sowerby's name having priority by 

 twenty years. 



10. V. Californica, Soicb., MSS., "California," has never been confirmed 

 from any point within the Oregonian and Caiifornian Province, and is undoubt- 

 edly an error. 



31. V. similis, Soivb., for which no habitat is specified, should be credited to 

 the Gulf of California. 



All of the West American species are well represented in my collection, though , 

 with the exception of V. variabilis they may be justly considered as rare. 



* 1 refer to American species. 



