188 PROCEEDINGS OF THE CALIFORNIA 



39. T. suffusa has been confounded with the latter, and the latter has, in 

 some instances, been wrongly credited to the Gallapagos. T. suffusa appears 

 to be the W. Indian analogue of T. Pacifica. 



29. T. pulla, Gash., " Gallapagos Islands ;" quite likely correct ; it is a 

 rare species ; Carpenter I'eports one specimen in the Mazatlan collection of 

 Eeigen and I have it ia my cabinet from the Gulf of California. 



31. T. radians, Lnm., "IMazatlan-Ecuador ;" these localities are correct, 

 but it can justly claim a more northern extension than Mazatlan, as it was col- 

 lected by Mr. Gabb, in 18G7, at San Juan, Lower California, and Dr. Cooper 

 probably collected it at San Pedro, in the Oregonian and Californian province, 

 as he credits it to that place, which is about a thousand miles north of Mazat- 

 lan. It is said to extend south of the equator to Peru, from which place, I 

 think, I have received specimens. It belongs to the W. Alexican and Panamic 

 province. 



34. T. sanguinea. Gray "Mazatlan-Ecuador." As to the southern limit of this 

 species I have no data ; but its northern line must be moved about the same 

 distance as the previous species, viz.: to Catalina Island, off" the coast of Cali- 

 fornia, and it belongs in the same province with 31. 



36. T. Solandri, Gray, "Pacific Ocean ;" from which it would be inferred that 

 this species was an Indo-Pacific, rather than a West American form. Its spe- 

 cific centre is the Gulf of California, where it is quite abundant ; it has been 

 collected on the coast of California by Dr. Newcomb, also by the late Mr. 

 Hepburn, as far north as Santa Barbara, * and Dr. Cooper credits it also to 

 San Nicholas Island. It has not been reported south of Acapulco, and belongs 

 to the northern part of the Mexican and Panamic province. 



38. T. subrostrata. Gray, "West Indies." Undoubtedly correct. In the 

 Mazatlan catalogue (species 444), Dr. Carpenter mentions a Trivia closely re- 

 sembling this West Indian form, which, on the strength of Dr. Gray's identi- 

 fication, was listed under the above name. That the solitary Mazatlan shell 

 referred to is identical with the West Indian, is highly improbable. 



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

 resentative of the Porcellanidas (Cyprajidae) has been detected, is the rocky point 

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

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

 miles farther north f than the species (Trivia Californica or any other related 

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



Passing to the Amphiperasidse — the catalogue of which is published in con- 

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

 the paper of Professor Gill "On the Relations of the Amphiperasidae," published 



* See mv lists of Hepburn's and Newcomb's collections at Santa Barbara, 

 etc.. in the^ro. Cal. Acad. Nat. Sci., Vol. Ill, pp. 283-286, and pp. 343-345. 



f I refer to American species. 



