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LAND AND rRKhir-^VATKIt SIIKI-LS OF N. A. [rAKT II. 



My decisions in regard to the synonymy of this species are 

 based on actual examination of ]\Ir. Lea's type of Fl. hellw^, 

 which is an immature sliell, and the description copied below. 



Plannrhis hellui^, Lea. — Shell orbicular, above regularly concave, beiieatli 

 widely umbilicate, greenish-yellow, closely and beautifully striate ; wliirls 

 four, carinate above, sub-cariuate below ; lip sharp, aperture small, within 

 reddish-brown. 



Hub. Tennessee : Dr. Troost. My cabinet, and cabinet of Dr. Troost. 

 Diam. .40, length .22 of an inch. 



A single specimen only of this species was received from Dr. Troost. 

 Like the P. corpulenfus (Say), it is covered with strije, but in the bellus 

 they are much closer and more regular. It is a much less inflated shell, 

 and more regular in its form. (Led.) 



rianorhis bican'natus of Sowerby's Genera of Shells seems to 

 represent this species rather than hicarinalus. 



Fi2. 185. 



Planorl>is haldemaili, Dctxker. — Shell discoidal, depressed, 

 rather solid, pale horn-colored (?), obsoletely striate, 

 rather concave both above and below, almost flat, pitted 

 in the middle of each side ; whirls five, oval, rather in- 

 volute ; aperture ovate heart-shaped, dilated, almost 

 campauulate. 



Shell discoidal, flat, rather solid, delicately striate, 

 very slightly concave above and below, as well as almost 

 flat, with a pit in the centre. Whirls five, moderately 

 increasing, not very involute, ovately-rounded. Aper- 

 ture oval, almost heart-shaped, widened, resembling 

 thai of Plan, campanulntus, which is bell-shaped. 

 Greatest diam. 6 lines, height almost 2 lines. 



Mexico : Prof. Liebniann. 



Tlie specimens are worn, but apparently were pale 

 horn-colored when fresh. (Kiisler.) 



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