BIBLIOGRAPHY OF 1 873. 175 



Zonites, Vit/ina, Helix, Glyptosioma (a new subgenus characterized 

 at p. 244) and Siiccinea. The paper also includes a list of the 

 species noted by the authors in various other publications, as 

 a summary of their observations and the conclusions arrived at 

 therefrom. 



Hassler (Dr. F. A.)— Tenacity of Life in Littorina muri- 



cata. — Acad. Nat. Sci. Philad. 1873, p. 284. 



The author in this note details experiments on 140 indi- 

 viduals from St. Domingo, 



Stearns (Robert E. C.) — Descriptions of New Marine 

 Shells from the West Coast of Florida. — Proc. Acad. 

 Nat. Sci. Philad. 1873, pp. 344 to 347 and 4 cuts. 



These are Anachis semipUcata, A. acuta, Nitidella pilosa, 

 and ClathureUa Jetvetti. 



Lea (Isaac). — Description of Seven New Species of 

 Unionidae of the United States. — Proc. Acad. Nat. Sci. 

 Philad. 1873, pp. 422 and 423. 



U. infidgens, U. subolivacei/s, U. cirratus, U. suhcylindraceus, 

 U. hasfatus, U. corneus, and U. stnimosus. 



Lea (Isaac). — Description of Three New Species of 

 Uniones of the United States. — Proc Acad. Nat. Sci. 

 Philad. 1873, p. 42 |. 



U. Dooleyensi's, U. invenustus, and U. Gesnerii. 



Sowerby (G. B., jun.) — Descriptions of Twelve New 

 Species of Shells. — P.Z. S.;Nov. 4, 1873, pp. 7 18 to 722, 

 and plate lix., coloured. 



The species are Cydostoma balteatiwi (Madagascar), C. filo- 



striatum (Madagascar), C. consangiiineiim (Madagascar), Typhis 



expansiis (Hab. ?), Entrochus alter7iatus (Australia?), Tornatella 



