302 New Genus of Brachiopoda. 



becomes obsolete at about half the distance to the beak ; a corres- 

 ponding elevation on the dorsal valve. On each side of the mesial 

 sinus and elevation there are three short plications ; there also 

 three on the elevation of the dorsal valve, and two in the sinus of 

 the ventral valve ; beak of ventral valve short, incurved at the 

 point, but elevated above and not in contact with the umbo of 

 the dorsal valve ; the beak of the latter strongly incurved. 

 Length, five lines ; width, four lines and a half; depth of both 

 valves, four lines. 



Locality and formation. — Black River Limestone, Pauquette's 

 Rapids. 



Camerella Panderi, Billings. 



Description. — In this species some of the specimens are nearly- 

 circular, in others the length is one-fourth greater than the width ; 

 both valves evenly convex ; a broad, obscure sinus in the front of 

 the ventral valve, which extends one-fourth the distance to the 

 beak ; a corresponding elevation in the dorsal valve. The front 

 of each valve is also marked with several very obscure indentations, 

 of which the sinus has one or two, and the mesial elevation of the 

 dorsal valve two or three. Beak of ventral valve short, incurved, 

 but not in contact with the umbo of the other valve. Beak of 

 dorsal valve strongly incurved. Length, four or five lines ; width, 

 equal to or a little less than the length. 



Locality and formation. — Black River Limestone, Pauquette's 

 Rapids. 



Camerella longirostra, Billings. 



Description. — This little species has much the form of C. Pan- 

 deri, except that the beak of the ventral valve is very much 

 elongated and erect, or only slightly curved at the point. There 

 are no plications in the front of the valves, but only a single 

 smooth-rounded mesial fold and sinus. Length of ventral valve, 

 four lines and a half, width three lines ; length of dorsal valve, 

 three lines and a half; length of beak of ventral valve, one line. 

 These measurements refer to a single specimen, " the only perfect 

 one collected. It may be hereafter ascertained that the species is 

 much longer. 



Locality and formation. — Chazy, Mingan Islands. Collected 

 by Sir W. E. Logan. 



