NEW SPECIES OF SHELLS. 15 



formed. For several specimens of this shell I am in- 

 debted to Mr. Titian Peale. 



Genus SUCCINEA. Crap. 

 Shell oval or oblong; aperture large, oblique; columel- 

 la narrowed. 



SPECIES. 



S, ovalis. Shell suboval, pale yellowish, diaphanous, 

 very thin and fragile, with nearly three oblique volutions. 

 Body very large. Spire small, but little prominent, 

 somewhat obtuse. Aperture longitudinally snbovate, large. 

 Columella much narrowed so as almost to permit the view 

 of the interior apex, from the base of the shell. Scarcely 

 any calcareous deposit on the pillar lip. Length nine-twen- f 

 tiethsof an in:h, aperture seven-twentieths. 



Inhabits marshy grounds in shaded situations. Com- 

 mon. 



Collection of the Academy. 



Animal longer than its shell, furnished with four ten- 

 tacul^the two superior ones longer, cylindrical, support- 

 ing the eyes; inferior ones, short, conic. Colour pale with 

 minute black points, which are assembled into fascia on 

 fhe sides and fillets on the neck above; neck granulate 

 above, a black line passes each side on the neck, from the 

 tip oftheoculiferoustentacula, gradually disappearing un- 

 der the shell. Front truncate, quadrate. 



When the animal is living, so vitreous is the shell, that 

 all the markings of its body are plainly discernabie. So 

 that although the shell is of a straw-colour, immaculate, it 

 appears of a dusky hue, with a remarkable white, flexu- 

 otis, longitudinal vitta on the back, arising from the su- 



