1L>4 t'AMl'OKNlA ACADKMV OK SCIICNCES. 



Genus Haminea Leach. 



Sliell oval-globular, spiral ventricose, corneous, thin, covcri-d by a slight, smooth tpidcrmis; 

 spire involute. 



Ilmninca hijdntii^ Linn, is a characteristic species. 



154. Haminea virescens Sowerby. 



Pl,ATK VIII, FlO. 18. 



Bulla virescens S\\\., Gen. Rec. Moll., No. XXXIX, fifj. 2. A. Adams, Thes. Conch., Vol. II, 

 p. 579, PI. CXXIV, fig. 83, 1850. Cpr., Brit. Assn. Rej)!., 1863, p. 646. = H. cymbi- 

 forniis Cpr. {.fide Dall, Trans. Wagner Inst. Sci., Vol. Ill, Part i, 1890, p. 18). 

 Keep, West Coast Shells p. 126, 1892. Williamson, Proc. U. S. Nat. Mus., 

 Vol. XV, 1892, p. 195. Trvon, Man. Conch., Vol. XV, p. 360, PI. XL, lig. 5; 

 PI. XLIII, fig. 19, 1893. 



Shell small, subglobular, thin; spire wanting: aperture full length of shell; posterior portion 

 of lip projects only slightly beyond ape.x; anterior part of aperture broadly ovate, tapering into a 

 canal at the posterior extremity; surface smooth and shell translucent. 



Dimensions. — Long. 7 mm.; alt. 6 mm.; aperture 7 mm. x 4.5 mm. 



One of the specimens sliows the green color of the living shells. Dr. Dall 

 says of this species: "The specimens (Caloosahatchie beds) have been compared 

 with typical specimens of H. virescens, and agree exactly. This is one of the cases 

 where, so far as known, a species formerly inhabiting both coasts of North America 

 has become extinct since Pliocene times on one side of the continent while persist- 

 ing on the other. It is quite possible, however, that a more thorough exploration of 

 the Antillean region would show the species still living there." 



Rare in upper San Pedro series of San Pedro; two specimens found. The 

 specimen figured is from the upper San Pedro series at San Pedro, and is now in the 

 collection of Delos Arnold. 



Living. — Santa Barbara to San Diego (Carpenter). 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — Caloosahatchie beds, Florida (Dall). 



Order PULMONATA. 

 Suborder S T Y L O M M A T O P H O R A . 



Superfamily MONOTREMATA. 



Family XLV. HELICIDvE. 



Genus Helix Linne. 



Subgenus Epiphragmophora Strobel. 



Shell umbilicate, fusco-calcareous; peristome expanded, nearly circular; a solid calcareous 

 epiphram. 



Helix cuyana Strobel is a characteristic species. 



