328 BIBLIOGRAPHY. 



P. fontinale v. pulchella Jenyns. Scarce in a pond at Ferry- 

 bridge; and at Wentbridge. 



P. fontinale v. cinerea Alder. Stream at Hooton Pagnell. 



P. pusillum Gmelin. Pannal; pond near Castleford ; and rarely 

 in a ditch at Newton, Wakefield. 



P. nitidunn Jenyns. Sparingly at Bardsey; Bramham; Rother- 

 ham; ponds at Hickleton; Wath nr. Sheffield; Kirklees; 

 Batley; Saltaire; abundant at Newton; in a ditch, St. 

 Swithin's Wood, Wakefield; common about Crofton, 

 Ryhill and Notton. 



BIBLIOGRAPHY. 



Manual of Conchology, structural and systennatic. — 



By Geo. W. Tryon, junr., Conservator of the Conchological 

 Collection of the Academy of Natural Sciences, Philadelphia. 

 Parts xiv and xv. 



Part xiv, which contains 64 pages of letterpress and 41 

 plates, commences the family Turbinellidse, embracing the genera 

 Turbinella and Vasum and the subgenus Caricella, and includes 

 1 1 species. The family Volutidae is divided into operculates and 

 inoperculates. In the latter division are the genera Cymbium, 

 Melo and Valuta. In the former are Volutolyria, Lyria and 

 Microvohcta. The fossil genera are Vohitoderma, Volutomorpha, 

 Rostellites, Volutifusiis, Athleta, Leioderma, Ptychoris, Pletoptygma, 

 Cryptochorda and Gosavia. The genus Ficiihpsis is removed from 

 Volutidae to Ficulidse, and Otocheilus is considered synonymous 

 with Cythara in the the Pleurotomidae. The family Mitridse as 

 monographed by Sowerby contains nearly 500 species, but the 

 increased knowledge acquired as to specific variation enables the 

 number to be greatly diminished. The following genera are 

 enumerated: — Mitra, Thala, Ztefliana, Mitroidea, Dibaphus, 

 Turricula, Cylindra and Imbricaria. The fossil genera are 



J.C, iii., July, 1882 



