392 Canadian Record of Science. 



MOLLUSCOIDEA. 

 Brachiopoda. 

 Eafinesquina lata. (Sp. nov.) 



Shell large, adult specimens measuring as much as 

 three inches along the hinge line, deeply concavo-convex, 

 much broader than long, and broadest at the hinge line : 

 cardinal angles produced. Ventral or pedicle valve 

 strongly convex exteriorly, usually regularly arched from 

 back to front, most prominent and in some specimens 

 gibbous and even obtusely subangular about the mid- 

 length, with the visceral disc flattened obliquely, in others 

 most tumid in the umbonal region posterior to the mid- 

 length, its beak moderately prominent, its cardinal area 

 wide and about four millimetres and a quarter in height. 

 with a broadly triangular deltidium in the centre. Dorsal 

 or brachial valve deeply concave, closely following the 

 curvature of the ventral, its cardinal area about one mm. 

 and a quarter in height, and its beak apparently small. 



Surface of both valves marked with very numerous and 

 closely disposed, threadlike radiating raised lines or 

 minute ridges. In the only well-preserved dorsal valve 

 known to the writer these radii are very nearly equal in 

 size, but upon the ventral valves of several specimens they 

 are unequal in size and irregular in their disposition. In 

 some places the larger radii alternate with the smaller 

 ones, but in others there are from two to four, or even 

 more, of the smaller radii between two of the larger ones. 

 In addition to these radii, the visceral disc of the ventral 

 valve of some specimens is marked with comparatively 

 coarse, undulating, concentric but somewhat interrupted 

 corrugations. 



Hinge dentition and characters of the interior of both 

 valves unknown, but an imperfectly preserved cast of 

 the interior of the shell of a ventral valve shews that the 



