OP COXCHOLOQY. ITS 



Dr. Nevvcomb, who has assumed the task of identifying the 

 terrestrial Mollusca collected bj the Geological Survey of 

 California, has, within the last few years, described a number 

 of new species of Helix inhabiting that State and Oregon, 

 Many of these are very beautiful species, of different type 

 and more brilliant color than those of the Atlantic and Middle 

 States. The number of species of Californian Helices is al- 

 ready quite large. 



Description of new species of Marine Shells from the Coast 

 of California: BY WM. M. GABB. 



Muricidea Barharensis. Ptychostylis, n, g., [Trochiclse.) 

 Surcula perversa. " caffea. 



" Carpenteriana. Emarginula hella. 



Clathurella constricta. Oadinia (s.g. Rowellia, Cooper.) 

 " crystallina. " {R.)radiata,Qoo'^QV. 



Daphnella clathrata. Tylodina fungina. 



Mangelia hexagona. Circe [Lyoconcha) Newcombiana. 



Turhonilla. gracillima. Yoldia Gooperii. 

 Cancelhria (Narona) Coojpern. 

 Calliostoma tricolor. 



II. FOREIGN. 



British. 



Concho] ogica Iconica : by lotell keeve. 

 Parts 238, 239, Marginella, Sigaretiis, Unio. 

 Parts 240, 241, ditto. 

 Parts 242, 243, Ancillaria, Unio. 



Marginella (Aug., 1864,) is still incomplete; thirteen plates 

 have, so far, appeared, illustrating fifty-seven species, of which 

 the following are new : — 



M. vitrea. M. quadrilineata. 



Sigaretus (July — Sept., 1864,) is completed, with twenty- 

 seven species, illustrated by five plates. The new ones are: — 

 S. incisus, Malacca. aS'. pellucidus, Malacca. 



" coarctcttus, Singapore. " jD/ci!?/s, Adelaide, S.Australia. 



" tumescens. " argenteus, Australia. 



" ohlongus. " fibula. 



" eximius, Malacca. 



Ancillaria (Nov., 1864.) This monograph comprises fifty- 

 one species, being seven more than were monographed by 

 Sowerby in 1859, in his Thesaurus Conchyliorum. The new 

 species are: — 



