C84 SEPORT — 18G3. 



before consiclcrecl as essentially tropical. Along witli ttese are not only some 

 species of types hitherto regarded as almost exclusively Asiatic, as Vertkordirt, 

 ,'SolaneUa, and Fulvia modesta, but also some which belong to the sub-boreal 

 distri.;t, as Lutina horealis, Venericardia horealis, and Crendla decussata. Tho 

 latter belongs to the British, and not to the N. England form. 



129. Of the blendingof the temperate and tropical faunas on the peninsula of 

 L. California we are still in ignorance. All we know is, that at Margarita Bay 

 the shells are still tropical, and that at Cerros Island they are strangely inter- 

 mixed. There is peculiar evidence of connexion between the faunas of the penin- 

 sula and of S. America, not only in the land-shells {v. anted, p. G30), but in 

 some of the marine forms. Beside identical S2)ecies with wide range, as many Ca- 

 lyptrajids, the following are coordinate between the North and South Pacitic: — 



Uj)per and Loiver California. 

 1\ etastoma Darwinii. 

 Solecurtus Califoruianus. 

 Semele rupium. 

 Callista var. puella. 

 Chama pellucida. 

 Liocavdiinu .substriatum. 

 Axiuasa ( Barbarensis.) 

 Verticordia novemcostata. 

 I'ecten luquisulcatus. 

 Siphoiiaiia tliersites. 

 Tonicia liueata. 

 Acm;iea patiua. 

 AcmiBa persona. 

 Scurria mitra. 

 Chlorostoma fimebrale. 

 Mitra niaura. 

 Eanella Californica. 

 Priene Oregonensis. 

 Troplion multicostatus. 



South America, 

 N. Darwinii. 

 S. Dombeyi. 

 (Ditto, Galapagos.) 

 C. pannosa. 

 C. pellucida. 

 L. Elenense. 

 A. intermedia. 

 V. ornata. 

 P. ventricosus. 

 S. lateralis, &c. 

 T. lineolata. 

 A. scutum, D'Orh. 

 A. " Oregona/' //. C. 

 S. scurra. 

 C. mcestum. 

 M. maura. 

 E. ventricosa. 

 P. cancellata. 

 T. Mag-ellanicus. 



Time and space do not avail for pointing out further relations with exotic 

 faunas ; which indeed will be performed with greater correctness after Dr. 

 Cooper shall have published his comi:)lete lists. 



130. For the sake of avoiding the inconvenience of trinomial nomenclature, 

 the subgeneric and varietal names have often been cited in this Report instead 

 of the generic and specific, in order that the exact form of the shell quoted 

 might be more quickly determined. The diagnoses of all the new species 

 here tabulated are written for the press, and will shortly appear in the dif- 

 ferent scientific journals. Additional specimens will probably prove several 

 forms to be conspecific which are here treated as distinct. In the present 

 state of the science, absolute certainty is not to be attained. The object of 

 the writer* has been principally to bring together the works of his prede- 

 cessors, and so to arrange and describe the new materials that those who 

 continue his labours may be able to draw their own conclusions from existing 

 data. In order to facihtate reference, a brief index is here given of the 

 subject-matter of the former and of the present Reports. 



* The best tlianks of the writer are due to Hugh Cuming, Esq., for the free use of his 

 collection ; to Messrs. H. & A. Adams, Hauley, Reeve, and Sowerby, for aid in identifying 

 specuncns ; to the officers and naturahsts connected with the Smithsonian Institution ; 

 to Dr. A. A. Gould, for very valuable corrections ; and generally to authors and friends, 

 who have kindly rendered him all the assistance in their power. He earnestly invites 

 criticisms on the subject-matter of the two Reports ; in order that they may be embodied, 

 and errors corrected, in the Manuals of the West-Coast Mollusca which he has uudertaken 

 to prepare for the Snutlisonian Institution. 

 iFarrinr^tuii, Auy. '12nd, 186i. _„ 



