94 CURRENT LITERATURE. 



VARIATION. 



New Varieties of Sphaerium and Unio. (Brit. Nat., p. 233, 1S92.) 



Mr. W. A. Gain describees a var. translucens of S. ovale and a var. major of 

 U. pictorum, the latter 127 mm. long. 



U. pictorum v. ponderosus. (Brit. Nat., p. 257, 1892.) 



Mr. Walter E. Collinge points out that Mr. Gain's var. major is synonymous 

 with the U. poiiderosits, Spitzi. This latter form must therefore take precedence. 



Notes on Varieties. (Brit. Nat., p. 212, 1892.) W. A. Gain. 



A. ater v. bicolor in Devonshire and I. of Man. (Jy. Conch., p. 77, 1892.) 

 W. D. Roebuck. 



SPECIAL FAUNA AND DISTRIBUTION. 



Marine Shells of San Pedro Bay, U.S.A. (Proc. U.S. Mus., pp. 179-220, 

 pi. xix.-xxii, 1892.) 



Mrs. Burton Williams gives a most interesting and exhaustive account of the 

 Marine Mollusca of San Pedro Bay. An introduction prefaces the list, which 

 enumerates 336 species. Vitrinella williamsoni, Dall. , and Ampkisa bicolor, 

 Dall., are new species. The list is illustrated by 38 figures, anil reflects great 

 credit on the industry and care of the authoress. 



The Irish L. and F. Mollusca. (Irish Nat., Oct. -Dec, 1892.) 



Dr. ScharfTs interesting series of papers on the Irish Mollusca are brought to 

 a conclusion in the December number. An important change in the nomenclature 

 is Helix intersecta, Poir., — //. caperala, Mont. The genera Alexia, Melampus, 

 and Otina are included among the Land and Freshwater Mollusca, while the 

 generic name Aplexa is retained for Physa hypnorum. 



Rare Mollusca from Co. Sligo. (Irish Nat., p. 170, 1892.) 



Miss Amy Warren records the occurrence of Montacuta dawsoiii, Jeff., in 

 Killala Bay, and Odostomia nitidissima, Mont., from shell sand at Enniscrone. 

 Vertigo auguslior and V. substriata, are also mentioned as having been found in 

 Killanley Marsh, Co. Sligo. 



Notes on the Marine Invertebrate Fauna of Plymouth for 1892. 

 (Jour. Mar. Biol. As,., II, pp. 333-339, 1S92.) 



Mr. W. Garstang records the occurrence of various molluscs, chief of which 

 are the Nudibranchs, Calma glaucotdes, Embletonia pulchra, Amphorina ccerulea, 

 Antiopa kyalina, Stiliger bellula, Lomanotus, and Idalina elegans. 



The Endemic Features of the British Slug-fauna. (Sci. Goss., p. 255, 

 1892.) 



Mr. T. D. A. Cockered gives a series of notes on forty-four varieties and 

 mutations of British slugs peculiar to Britain. [Until these varieties are proved 

 to be permanent variations and not chameleonic or temporary, or what, in a 

 number of cases, is more likely, young stages of different slugs, but little 

 satisfactory information will be obtained.] 



Contrib. to the Authen. Records of Derbyshire. (Jy. Conch., p. 77, 

 1S92.) L. E. Adams. 



L. and F. Shells at Karachi. (Jy. Conch., p. 81, 1892.) G. W. Adams. 



V. pygmaea, Extraordinary finds of. (Jy. Conch., p. 89, 1892.) R. Standen. 



P. ringens in Cheshire. (Jy. Conch., p. 89, 1892.) R. Standen. 



Shells from E. Bolivia and W. Brazil. (Jy. Conch., p. 90, 1S92.) G. F. 

 Ancey. 



