ACADEMY OP SCIENCES. 187 



32. L. Goodiilii, Gray, is credited to Lord Hood's Island, whicb is quite in- 

 definite, as many islands have been so named — one in the Gallapagos group, 

 which would connect this species with the Central American fauna. This spe- 

 cies, however, is not found there, but pertains to the Indo-Pacific province — 

 perhaps to "Lord Hood's Island" in the Paumotu group. 



49. L. onyx, Linn., "San Diego I." If, by the habitat given, San Diego or 

 the islands off that coast are meant, it may be intended for one of the Ooron- 

 ados ; but L. onyx is not found there — neither at San Diego or at any other 

 point on the west coast of America. As the species in some of its varieties re- 

 sembles in coloration 69, the blunder on the part of the original author may be 

 thus explained. 



68. L. Sowerbyii, Kiener, for which no habitat is given, is found in the Gulf 

 of California, and consequently belongs in the same province with No. 1. Some 

 authors have confounded this species with L. picta. Gray, which latter is Afri- 

 can. In Sby's Conch. Illust., L. picta is credited to "Guaymas ;" while L. 

 Sowerbyii, through its synonym, "zonata. Lam," is without habitat. 



69. L. spadicea. Swains., "New Holland," is a Californian, credited by Dr. 

 Cooper to "Santa Barbara, San Diego and islands," which is correct, being 

 confirmed by my published and manuscript lists. It is a well-marked species 

 and quite distinct from 49. It is figured in "Chenu's Manuel," Vol. I, fig. 

 1715 — the outline of which is well enough, but the dark spots so prominently 

 represented might lead astray. 



4. Aricia arabicula, Lam., is properly credited to "Acapulco," though its 

 specific centre is in the neighborhood of Mazatlan, Gulf of Califcrnia, where 

 it is quite common. Its occurrence at Panama is exceedingly rare. Professor 

 C. B. Adams found but " 7 specimens on the reef"; while of fifty-nine (Lu- 

 pouia) punctulata. Gray, credited in the List to "Mazatlau-Panama," he col- 

 lected "335 specimens." Mazatlan is quite likely an error, for in the great mass 

 of material from that place, and from other points on the Gulf of California 

 which has passed under my examination, I have never detected a specimen. It 

 is sometimes washed up dead by the winter storms at Cape St. Lucas. 



We find in the Genus Trivia of Mr. Roberts' list, numbered "10, T. depau- 

 perata, 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 aloi;g 

 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 



Froc. Gal. Acad. Sci., Vol. IV.— 14 January, 1872. 



