574 Mr. Gray's Monograph on the Ci/prceidce. 



time. The latter, however, is quite smooth at the back, and 

 never acquires any striated coat, or even a denticulated edge. 



When I commenced this Monograph, I intended to have sepa- 

 rated this species from the other Cowries, as a distinct genus, 

 under the name of Ci/prwovula (Zool. Journal, i. 75) but on 

 further consideration, I have been induced to change the opinion 

 which I had then formed ; for, on considering the very grea* 

 differences which are found in the teeth of these shells, I must 

 own I am very unwilling to make use of them as the distinguishing 

 character of a genus. Indeed were it not for the peculiarity 

 (which I believe I first pointed out) of the Ovidce having the 

 young shell always longitudinally grooved, I should be inclined 

 to place them also in the same genus with the Cowries. 



113. Cyprcea ductylosa. — Finger-like Cowry. 



Testa tenui, oblonga, cylindracea, obtusa, longitudinallter 

 striato-costata ; striis convexis, angustis, numeiosis, alternatim mi- 

 noribus, interstitiis laevibus. 



Cypraea dactylosa. Lamarck^ Ann. Mus. xvi. n. 13. Hiii. Anim. 

 sans vert. vii. 407. Defiance, Diet. Sci. Nat. xliii. 37. 



Cypraea Gervillii. Sow. Genera. 



/3 Georgii. Testa ovata subventricosa. 



Cypraea Georgii. Defrance, 1. c. 



Icon. Sow. Gen. Shells, t. Cyprcea, f. 8. 



Fossil. France. Grignon ? La/w. JVlouchy le Chatel? Defrance^ 



— /3 Nehou. Defrance. 



Shell nearly oblong, ovate, white, with numerous longitudinal 

 rib-striae, which are narrow, convex, and alternately smaller ; 

 they pass over the centre of the back without any interruption, and 

 the spaces between them are quite smooth ; the outer lip is slightly 

 produced and rounded behind, slightly thickened and incurved ; 

 the inner lip slightly thickened and obscurely denticulated, the 

 denticulations on both sides being caused by the ribs. 



Axis l-l? diameter JL of an inch. 



The variety is shorter, more ventricose, and smaller, not exceed- 

 ing 1 inch iu length. M. Defrance now considers it only a variety. 



