684: REPORT—1863. 
before considered as essentially tropical. Along with these are not only some 
species of types hitherto regarded as almost exclusively Asiatic, as Verticordia, 
Solariella, and Fulvia modesta, but also some which belong to the sub-boreal 
district, as Lucina borealis, Venericardia borealis, and Crenella decussata, The 
latter belongs to the British, and not to the N. England form. 
129. Ofthe blending of 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 peculiarevidence of connexion between the faunas of the penin- 
sula and of 8. America, not only in the land-shells (v. anted, p. 630), but in 
some of the marine forms. Beside identical species with wide range, as many Ca- 
lyptreeids, the following are coordinate between the North and South Pacific:— 
Upper and Lower California. South America, 
Netastoma Darwinii. N. Darwinii. 
Solecurtus Californianus. 8. Dombeyi. 
Semele rupium. (Ditto, Galapagos.) 
Callista var. puella. C. pannosa. 
Chama pellucida. C. pellucida. 
Liocardium substriatum. L. Elenense. 
Axinwa (Barbarensis. ) A. intermedia, 
Verticordia novemcostata. V. ornata. 
Pecten equisulcatus. P. ventricosus. 
Siphonaria thersites, S. lateralis, &e. 
Tonicia lineata. T. lineolata. 
Acmeea patina. A. seutum, D’ Ord. 
Acmiea persona. A. “Oregona,” H.C. 
Scurria mitra. S. scurra. 
Chlorostoma funebrale. C. moestum, 
Mitra maura. M. maura. 
Ranella Californica. R. ventricosa. 
Priene Oregonensis. P. cancellata. 
Trophon multicostatus. T, Magellanicus. 
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 complete lists. 
130. For the sake of ayoiding the inconyenience 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 facilitate reference, a brief index is here given of the 
subject-matter of the former and of the present Reports. 
* The best thanks of the writer are due to Hugh Cuming, Esq., for the free use of his 
collection ; to Messrs. H. & A. Adams, Hanley, Reeve, and Sowerby, for aid in identifying 
specimens ; to the officers and naturalists connected with the Smithsonian Institution ; 
to Dr. A. A. Gould, for very valuable corrections ; and generally to authors and friends, 
who haye 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 undertaken 
to prepare for the Smithsonian Institution. 
Warrington, Aug. 22nd, 1864. 
. 
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