THE NAUTILUS. 33 



A NEW JAMAICAN LAND SHELL. 



BY GEORGE II. CLAPP. 



Pleurodonte Adamsiana, n. sp. Plate II, Figs. 1, 2.* 



Shell imperforate, carinated, depressed, convex above, regularly 

 and very convex below, solid, dark purplish-brown with a white up- 

 turned carina ; the whole surface, with the exception of the apex, 

 densely, finely granulate ; apex subplanulate, almost smooth, shining, 

 yellowish-white ; sutures impressed ; whorls 5, convex, slowly widen- 

 ing and wavy ; body-whorl acutely carinated at the periphery, con- 

 cave above, convex below the carina, impressed in the umbilical 

 region, very slightly descending anteriorly, with a slight furrow or 

 groove, about 4 mm. long, just back of the aperture above the 

 carina ; carina white, translucent. Aperture oblique, subtriangular, 

 shining brown, inside showing the light peripheral band ; peristome 

 white shaded with brown, bearing inside the lower margin four 

 teeth ; a very small one near the insertion, then a larger on the basal 

 margin, then two near together on a common eminence toward the 

 outer angle of the aperture ; the last two teeth are united for over 

 half their height, the outer one turning sharply toward the peristome. 

 The base is deeply tri-scrobiculate behind the peristome, the outer 

 two grooves being in a common pit. Margins of peristome joined by 

 a thin transparent callus which sweeps around the umbilical region. 



Greater diameter 32, lesser 28, altitude 14 mm. 



"AVhitney Estate," Upper Clarendon, Jamaica. A single dead 

 but perfectly fresh and unweathered specimen. 



This species seems to unite two widely different groups, as it has 

 the aperture and teeth of P. peracutissima and the granulated surface 

 and supraperipheral furrow of P. sinuata. In general appearance it 

 is, however, unlike either. 



I take pleasure in naming this shell, one of the most beautiful of 

 the Jamaican Pleurodontes, after the late Prof. C. B. Adams who 

 did so much in working out the wonderfully complex molluscan 

 fauna of Jamaica. 



* Plate II will accompany the next issue. 



