BRACHIOPODA. 123 



Genus UNCINELLA, Waagen. 1883. 



PLATE LI. 



1883. Uncinella, Waagbn. Memoirs Geological Survey of India ; Palseontologia Indica, Ser. xiii ; 

 Salt-Range Fossils, vol. i, p. 494. 



This name has been proposed for a single rare species, Uncinella indica, occur- 

 ring in the middle division of the Productus limestone beds of India. 



Dr. Waagen has described the genus as follows : 



" In external shape the genus bears resemblance in a general way to Retzia. 

 The valves are more or less finely plicated ; no sinus or median fold is devel- 

 oped ; the hinge-line is curved ; the beak thick and strongly bent over, mostly 

 appressed to the cardinal part of the dorsal valve ; not provided with an area 

 on its dorsal side, but bearing a distinct deltidium. It is pierced behind the 

 apex by a large oval foramen. The apex of the dorsal valve is very strongly 

 bent over, and partly concealed under the apical part of the ventral valve." 



«« * * # 'pjjg shell bears spirals of the same general disposition as in 

 Retzia or Undies, but neither the loop nor the mode of junction of the primary 

 lamellae with the crura could be made out definitely. In the ventral valve 

 below the apex of the beak, there is an excavated, small but very distinct del- 

 tidium ; its composition of two pieces cannot, however, be made out. It does 

 not reach down to the hinge-line, but is cut out below for the reception of the 

 apex of the small valve. On both sides of the deltidium extend along the 

 curved hinge-margin two long ridge-like hinge-teeth. They are not supported 

 by dental plates, and there is also not a trace of other partitions. 



FIO. 108. FlO. 109. 



Inlerior oardiaal region of pedicle and brachial ralres of Uncinella indica, Waagen. 



(Waagen.) 



" In the dorsal valve the apex is flattened, as if ground down, and bears a 

 flat triangular space, as if for the insertion of muscles ; a cardinal process is 

 not present. At the apex two sharp ridges take their origin, limiting the 

 dental sockets on the other side. These latter are elongated, deep triangular 



