404 



the interior of the dorsal shews only a fine, linear, median groove, ex- 

 tending longitudinally from the beak almost to the midlength, and indi- 

 cating a rather short mesial septum. 



Extension mine, Nanaimo, eleven imperfect specimens ; and Texada 

 Island, four similar specimens ; all collected by Mr. Harvey in 1901. 



KiNGENA OCCIDENTALIS. (N. Sp.) 



Plate 51, figs. 7 and 7 a. 



Terebratula Wacoensis, Whiteaves. 1879. This volume, pt. 2, p. 177 ; but probably 

 not T. Wacoensis, Roemer, 1852. 



Shell compressed convex, broadly subelliptical and somewhat penta- 

 gonal, a little longer than wide and about twice as wide as high (or deep), 

 subtruncate. in front and bluntly pointed behind. 



Ventral valve not much more convex exteriorly than the dorsal, the 

 umbo of the former short, obtuse, and very slightly incurved, but its apex 

 or beak is unfortunately broken oflf in the only specimen collected. Dorsal 

 valve with a very small and slightly incurved beak, which is divided in- 

 teriorly and longitudinally by a median septum, that extends about half 

 way to the front margin. Surface everywhere minutely punctate, when 

 examined with a lens. 



Approximate dimensions of the only specimen known to the writer : 

 maximum length, about sixteen millimetres: greatest brealth, about four- 

 teen mm.; maximum convexity of both valves when closed, seven mm. 



Trent River, V. I., J. Richardson, 1871 : the specimen referred to in 

 the second part of this volume, which was provisionally identified with 

 the Terebratula Wacoensis of Roemer, which Schuchert has shown to be a 

 Kingena. A subsequent comparison of this fossil with numerous authen- 

 tic Texan examples of K. Wacoensis, presented to the Museum of the Sur- 

 vey by Prof. R. J. Hill, in 1889, has, however, led to the conclusion that 

 the former should be regarded as a probably distinct and previously un- 

 described species, characterized chiefly by its smaller size, narrower and 

 less convex lateral margins, and much more strongly compressed valves. 

 Dr. Stanton and Mr. Schuchert, who have examined and studied 

 the specimen upon which the foregoing description is based, agree in 

 thinking that it is distinct from K. Wacoensis. The marginal contour of 

 K. occidentalis is somewhat similar to that of the form of K. lima repre- 

 sented by Davidson on plate IV, figs. 24, 24a, and 24c, of the British Cre- 

 taceous Brachipoda, published by the Palfeontographical Society, but the 

 valves of the former are much more compressed, and the umbo of its ven- 

 tral valve is less incurved. 



