BIBLIOGRAPHY. l8l 



the depth of 250 metres were curiously softened and resembled in 

 condition the fossils of some of the tertiary strata of the middle 

 of France; this is considered to be chiefly due to pressure. 



Description of a new species or variety of Land 

 shell from California, — Helix v. circumcarinata.— By R. 



E. C. Stearns. — From the Annals of the N. Y. Acad, of Sciences, 

 Vol. I, No. 10, Nov., 1879. 



A full description and figures, of a Helix found in Stanislaus 

 county, California, by Mr. Crawford of Oakland, and regarded by 

 the author, as a variety of Helix Jiiornioniun^ under the name of 

 var. circuincaiinata. It would however be regarded by many au- 

 thors as a distinct species. 



Tenacity of life in freshwater mollusca. — By John L. 

 Hawkins. — Science Gossip, Jan. 188 1, p. 23. 



Some Limnoea stagnalis which were kept in an earthenware 

 jar, in a cold greenhouse, being neglected, the water evaporated, 

 leaving the shells dry. After they were discovered in this state, 

 they were left for about two months, when the jar was refilled with 

 water, and a number of the specimens shortly afterwards revived. 

 Mr. Hawkins remarks that the specimens which survived the ordeal 

 were the smallest and least developed. 



The deep sea Mollusca of the Bay of Biscay. — 



By J. G. Jeffreys, LL.D., F.R.S. — From the Annals and Magazine 

 of Natural History, Oct., 1880. 



Dr. Jeffreys by invitation of the French Minister of Public 

 Instruction, took part in the deep sea exploration in the Bay of 

 Biscay during July, 1879, in the 'Travailleur'. 



In th?t cruise 152 species were collected, five of which were 

 Brachibpods. Sixty-five were Conchifera of which Pecten ohliqii- 

 tus, Jeffr. MS., Lima Jfff/eysi, Fischer, MS., Myti/us iuleus, Jeffr., 



