4S 



EAST COAST MARINE SHELLS 



COSPIDAEIA ORNATISSIMA Orblgny. Range 2- 

 124 fathoms. Length 9.5 mm. 



PI. 65, Fig. 21 



North Carolina to West Indies 



COSPIDARIA PERROSTRATA Ball. Length 8 mm. 

 Range 58-416 fathoms. 



PI. 61, Figs. 3a, 3b 



South of Martha's Vineyard to West 



Indies 



GENUS LEIOMYA A. Adams 1864 



SUBGENUS HALONYMPHA Ball and Smith 



Sharp cardinal tooth in right valve; 

 no other teeth in either valve; rib extend- 

 ing posteriorly in both valves; surface 

 striated or smooth. 



LEIOMYA CLAVICULATA Ball. Length 12 mm. 

 Range 100-339 fathoms. 



PI. 61, Figs. 2, ga 



Florida Keys; Bermuda; West Indies 



Family Vertlcordildae 



GENUS VERTICORBIA Wood 1844 



SECTION EUCIROA Ball 1881 



VERTICORBIA ELEGANTISSIMA Ball. Length 

 13-40 mm. Range 292-756 fathoms. 



PI. 61, Figs, la, lb 



Off Cape Canaverel, Florida, to 



Cuba 



SUBGENUS HALIRIS Ball 1886 



VERTICORBIA FISCHERIANA Ball. Length 



10 mm. Range 84-229 fathoms. 

 PI. 61, Figs. 4a, 4b 

 North Carolina to West Indies 



ORBER TELEODESMACEA 



Animal vd.th reticulate gills, man- 

 tle lobes more or less connected; shell 

 porcellanous, or slightly prismatic, never 

 nacreous; seldom inaequivalve. 



Habits: Active or nestling; rare- 

 ly sedentary burrowers; often imbedded but 

 mostly occupying excavations of other or- 

 ganisms. Many of them live burled in the 

 surface of the sea bottom, including the 



Astartldae, and are more or less migratory. 



Family Pleurophorldae 



GENUS CYPRINA Lamarck 1818 



Shell large, heavy; no lunule but 

 a slight pit in its place; epidermis brown, 

 thick, wrinkled; edge simple. 



CYPRINA ISLANBICA Linn6 . A large thick 

 shell with umbones pointed forward and In- 

 ward so that they almost meet; ligament 

 strong and prominent; epidermis shining 

 and sometimes almost black; three cardinal 

 teeth in each valve; marginal tooth blunt 

 and rather indistinct; interior white. 

 Length 3.5 inches. 



An abundant shell in northern wa- 

 ters, especially near the mouths of rivers. 

 Young examples are frequently taken in the 

 stomachs of fish caxight in Massachusetts 

 waters. 



It is one of our largest northern 

 shells and might only be confused with 

 Venus mercenarla. The black epidermis and 

 lack of purple border easily separate it 

 from that shell. 



n. 13, Fig. 9 



Arctic Ocean to Cape Hatteras, 



North Carolina 



Family Corblculidae 



GENUS POLYMESOBA Raflnesque 1820; 

 Cyrena of authors, not Lamarck 



Shell oval, often with rough epi- 

 dermis; three hinge teeth in each valve; 

 two lateral teeth In each valve. 



Foot of animal strong, tongue- 

 shaped. 



They are inhabitants of brackish 

 or fresh water near the sea. 



POLYMESOBA CAROLINENSIS Bosc. Shell swol- 

 len, covered with rough shining epidermis; 

 shell deeply eroded toward umbones; hinge 

 teeth small. Length 1.75 inches. 



The erosion upon these shells is 

 due to their living in brackish or almost 

 fresh water where acids are prevalent. It 

 is abundant on marshes, subject to tides. 



PI. 16, Fig. 2 



South Carolina to Florida and Texas 



