BBACHIOPODA. 
215 
tellement unie et close, que les deux bords avancent un peu au dessus de la 
coquille. La charniere est tres courte.”— Fischer de Waldheim, 1830 ( loc. tit.). 
“ The general outline of the shells is more or less globular, with mostly very 
strongly inflated valves. The hinge-line is short, never projecting at the ex¬ 
tremities ; both valves are more or less strongly plicated radially. 
“ The ventral valve is always smaller than the dorsal one. The area of the 
ventral valve is sometimes high and strongly reclining, sometimes not; but 
laterally little extended, according to the short hinge-line. It is cut open in 
the middle by a tolerably large triangular fissure, which is never covered up 
by a pseudo-deltidium. 
“ The dorsal valve is always larger than the ventral one, with a strongly 
bent-over and sometimes rolled-in beak. The area is mostly small in this 
valve and even sometimes linear. The deltidialfissure is smaller than in the 
other valve. 
“ Both valves are covered all over with a very fine radial striation, similar 
to that occurring in many species of Orthis, and it appears not improbable 
that also in Enteletes fine hair-like spines were disseminated irregularly over 
this striation. The minute structure of the shell is punctate.” # * * 
“ Internally the ventral valve bears two strong elongated teeth on both sides 
of the triangular fissure, supported by very strong dental plates, which extend 
from the apex toward the front of the valve; but instead of diverging they 
approach each other toward the middle of the valve, bending around, either 
with a gentle curve or a sudden bend. Between these dental plates, beginning 
as a low ridge at the apex, a thin blade-like median septum extends; it is 
highest toward the middle of the valve and then suddenly terminates.” 
“ The dorsal valve has interiorly two very strong septa, which extend on 
both sides of the deltidial fissure, and project for a certain distance, strongly 
diverging into the interior of the valve. They support strong and long curved 
crura, which have exactly the shape of a boar’s tusks. They are laterally 
compressed and bear on their lower and inner side a sharp prominent ridge. 
The dental sockets are placed exteriorly to the origin of the crura. In the 
middle, at the apex of the valve, a small cardinal process is observable, having 
the form of a short narrow ridge.”— Waagen (loc. cit.). 
Type, Enteletes Lamarcki, Fischer de Waldheim, Upper Carboniferous lime¬ 
stone. 
American example, Spirifer hemiplicatus, Hall, Upper Carboniferous. 
