194 CALIFORNIA ACADEMY OF SCIENCES. 



Genus Haminea Leach. . 



Shell oval-globular, spiral ventricose, corneous, thin, covered by a slight, smooth epidermis; 

 spire involute. 



Haminea hydatid Liiiii. i.s a chai'acteristic species. 



154. Haminea virescens Sotcerbi/. 



Platk VIII, Fio. 18. 



Bu//a virescens Sby., Gen. Rec. Moll, No. XXXIX, fig. 2. A. Adams, Thes. Conch., Vol. II, 

 p. 579, PI. CXXIV, fig. 83, 1850. Cpr., Brit. Assn. Rept, 1S63, p. 646. = J7. cymbi- 

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

 Keep, West Coast Shells p. 126, [892. Williamson, Proc. U. S. Nat. Mus., 

 Vol. XV, 1892, p. 195. Tryon, Man. Conch., Vol. XV, p. 360, Pi. XL, fig. 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 apex; 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 shows tlie green color of the living sliells. Dr. Dall 

 says of this species: "The specimens (Caloosahatchie beds) have been com])ared 

 \vith typical specimens of H. virescenf^, and agree exactly. This is one of the cases 

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

 lias 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 s[)ecies 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). 



Pleiatocene. — San Pedro (Arnold). 



Pliocene. — Caloosahatchie beds, Florida (Dall). 



Order PULMONATA. 



Suborder ST YLOMMATOPHORA. 



Superfamily MONOTREMATA. 



Family XLV. HELICIDiE. 



Genus Helix Linne. 



Subgenus Epiphragmophora Strobel. 



.Shell umbilicate, fusco-calcareous; peristome e.xpanded, nearly circular; a solid calcareous 

 L-])ii)hram. 



Helix cuyana Strobel is a characteristic species. 



