We find in tlie Gonus Trivia of Mr. Roberts' list, numberecl "10, T. depnn- 

 pcrata, Sowb., California," which gives us one species more than we claim ; 

 unfortunate? specimens of "5. T. Californica, Gray, California," after re- 

 ceiving hard treatment in the surf and gravel on the beach — where Mr. Sower- 

 by's specimens were, without doubt, obtained — were finally recompensed by 

 specific honors. Having collected numbers of specimens at various points along 

 the coast, all of which have been carefully examined and compared, I have no 

 hesitation in placing Mr. Sowerby's species as a synonyme of T. Californica, 

 which extends southerly to the Gulf of California, where specimens are occasion- 

 ally detected. 



23. Trivia Pacifica, Gray, "Gallapagos," is correct ; but the species is also 

 found in the Gulf of California, and it is from the latter place that most of 

 the specimens in cabinets have been obtained ; it is not a common shell, and 

 from its resemblance to 



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, Gask., " Gallapagos Islands ;" quite likely correct ; it is a 

 rare species ; Carpenter reports one specimen in the Mazatlan collection of 

 Reigen and I have it in my cabinet from the Gulf of California. 



31. T. radians. Lam., "Mazatlan-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 18GT, 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. ^texican 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. Xewcomb, 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- 



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

 etc.. in the Pro. Cal. Acad. Nat. Sci., Vol. Ill, pp. 283-28G, and pp. 343-345. 



