82 NEW YORK STATE MUSEUM 



bollia Jones & Holl 



Bollia cornucopiae sp. nov. 



PI. 6, fig. 1, 2 



A single, odd-looking valve was found in the gray crystalline 



limestone pebbles from Kysedorph hill, which is referable to the 



genus Bollia Jones and Holl in a general way, but not to any of 



the species described as yet as constituting that genus. 



Diagnosis. Valve subrectangular, cardinal line as long as the 

 greatest length of the specimen, straight, cardinal angles nearly 

 rectangular, anterior and posterior margins subparallel in the 

 dorsal parts, curving inward ventrally, ventral margin subparallel 

 to the cardinal line, shorter than the latter by one third. Body 

 of valve flat, bearing a wide, u-shaped (horseshoe-shaped ridge 

 of authors) which anteriorly widens into a broad, evenly de- 

 pressed convex plate with an upturned border along the cardinal 

 line; in the center of the valve it narrows abruptly into a semi- 

 tubular ridge, which, slightly narrowing, completes the u-curve, 

 curving inward at the cardinal line and ending with a small 

 knob. Separated by a narrow furrow from this ridge and parallel 

 with the lateral and ventral margins, runs the high marginal, 

 obtusely angular ridge, which is highest along the lateral mar- 

 gins, and sinks rather aibruptly at the antero and positeroventral 

 angles almost to the level of the body of the valve. Its outer 

 wall slopes very steeply. All parts of the apparently very 

 thick-shelled valve are smooth. 



Dimensions. Length 1.4 mm; hight 1.2 mm; thickness .7 mm. 



Horizon and locality. One specimen found in a gray crystal- 

 line limestone pebble. (Group 7) 



Observations. This valve has in general outline and the char- 

 acter of the marginal ridge some resemblance to the more com- 

 mon form referred to Eurychilina s u b a e q u a 1 i s in this 

 paper. The central part, the flat body and u-shaped central ridge, 

 however, are entirely different from the evenly convex body of 

 that Eurychilina. 



