■*. 



#. 



488 



Binney^s Monograph of the Helices 



i-^ 



« » 



Aperture toothed. 



T. 



7. HELIX THYROIDUS. 



Plate XVIII. 



H. testa orbiculato-convexa, sub-umbilicataj luteo-cornea ; anfrac- 

 tibus tenuiter striatiSj striis confertisj obliquis ; appendlculo dentiformi^ 

 -obliquoj columellse adnato j peristomate alboj marline refiexo. 



\ 



Synonyms and References. 



Helix thyroidus, Say. Nicholson's Encyc. Am. Ed. 



Voh IV, Art. Conchology. 

 . Journ. Acad. Nat. Sc. PhiL Voh I; p. 123- 

 Vol.W,^. 161. 



American Conchohgy. No. ii, ph 13. , 

 Helix thyroidus, Ferussac. Hist. Nat. des Molh Fh 



r 



xLix, A. jig. 4. 



Cochlea umbilicata, Lister. Synops. Conch, t. 91^ 



Cochlea terrestris Virginiana. Schroter. Einleit. ii, p- 



192, Ab. 60. . , 



Mesodon leucodon. Rafinesque. 





Descriptio^t. 



Fi 



AnimaL Of a dirty whitish yellow, with a greyish 

 hue in some individuals, tentaculae darker, eyes black, 

 base of foot dirty-white ; foot rather narrow, terminated 

 posteriorly in an acute angle. Length equal to twice the 

 hreadlh of the shell. 



ShelL Rounded, convex : epidermis, immaculate, of 

 a uniform yellowish-brown or russet-color : whirls^ about 

 five, with fine, parallel striae running obliquely across 

 them ; suture, distinctly impressed ; aperture rounded. 



-r- 



