PHYSA. 91' 



Physa costata, Newcomb. — Shell ovate globular, lioru-colored or 

 reddish corueous ; whirls four, the last inflated and roundly angulated 

 above, armed with ten to fourteen prominent longitudinal ribs ; apex 

 acute ; spire short ; ap^ture ovate. 



Mus. Cal. Ac. N. S. My cabinet. 



For tliis curious species of Physu we are indebted to Dr. Veatch, who 

 collected several specimens at Clear Lake, California, most of them, how- 

 ever, immature. This is the only species provided with regularly arranged 

 costs that I have seen, and this character alone will be sufficient to sepa- 

 rate it from all other described species of the genus. (Newcomh.) 



Physa costata, Newcomb, Proc. California Ac. Nat. So. II, 104. 



I have seen no specimen of this species, that sent^e b}" Dr. 

 Newcomb having been Jost at sea. 



Pliysa SOlida, Philippi. — Shell perforate, longitudinally ovate, solid, 

 pale horn-color; whirls arched, apical whirls pointed, comprising one- 

 third the whole length of the shell ; mouth narrowed by the thickening 

 of the lip ; columella not folded. 



This is the heaviest species known to me, and is composed pj^. ^55 

 of six moderately arched whirls. The surface is sometimes 

 reticulated, owing to the striae of growth being crossed by 

 other lines, which are owing partly to delicate lace-like 

 prominences, and partly to a different degree of transparency 

 of the shell. Suture tolerably defined. Mouth longitudi- 

 nally ovate, columellar fold quite indistinct ; the inner lip 

 thick, adherent, forming an umbilicus; columella arcuate. Phi/susuUda. 

 Also the outer lip is thickened just within by a brownish-red 

 callus, which appears white from the outside. Height 71'", breadth 4|"'; 

 mouth 41'" high, 2J'" broad. 



Bab. New Orleans : My brother. 



Physa gyrina, Say, differs in having a thin, transparent shell, a shorter 

 apex, as does also Physa heterosiropha, Say, which has an obtuse apex ; 

 Ph. acuta, Dr., which resembles it in form, is smaller, thinner, and has an 

 apex comprising only one-fourth of tlie whole length of the shell. (Philipjii.) 



Physa solida, Philippi in Chemx. ed. 2, p. 6, pi. i, f. 5, 6. 



Of this species I have no fuller information than that con- 

 tained in the original description and figure copied above. 



The specific name appears to be preoccupied by Poticz and 

 Michaud, Gal. des Moll. I, 22V (1838). 



Pliysa virginea, Gould. — Shell slender and delicate, thin and 

 shining, of a milk-white or porcelain-white color; spire about one-third 

 the length of the shell, sharply pointed, of five or more moderately convex 



