BRACHIOPODA. 
123 
Genus UNCINELLA, Waagen. 1883. 
PLATE LI. 
1883. Uncinella, yfAAGEN. Memoirs Geological Survey of India; Palseontologia Indica, Sei-. 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.” 
u # * * shell bears spirals of the same general disposition as in 
Retzia or U?icites, 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. 
(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 
