BRITISH DEVONIAN BRACHIOPODA. 13 



but I have always felt uncertain whether we should be justified in adopting that sub- 

 genus. 



Waldheimia Whidbornei seems to differ from Wald. juvenis^ not only on account 

 of the great difference in its exterior shape, but also in the form and position of the 

 crura. It differs also from T. elongata by its straight front and by its much longer 

 loop. Wald. Whidbornei is very much rarer than W. jicvenis in the Middle Devonian at 

 Lummaton, near Torquay. 



2. Waldheimia (vel Macandrevia) juvenis, Sow. Dav., Dev. Mon., PJ. I, figs. 10 — 15 ; 



and Dev. Sup., PI. I, figs. 1, 2. 



When describing the external characters of this species at page 8 of my ' Devonian 

 Monograph,' I was unacquainted with its internal arrangements. Since then the Rev. 

 Norman Glass has, with much success, developed the loop in a number of specimens. 

 The primary stems are attached to the hinge-plate. The crura are of an unusually 

 elongated shape. These crura bend over from the inner edges of the primary branches 

 of the loop on the dorsal side. The loop or primary branches extend to three fifths of 

 the length of the dorsal valve, the reflected part of the loop being in about the centre of 

 the valve. The principal stems of the loop, which are very broad and nearly straight, 

 and parallel to each other, bend in only very slightly at their termination. 



Wald. juvenis is not very uncommon in the Middle-Devonian limestone of Lummaton, 

 near Torquay. 



3. Waldheimia ? sp. ? Dav., Dev. Sup., PI. I, fig. 5. 



From the black, Middle-Devonian limestone or shales at Hope's Nose, near 

 Torquay, Mr. G. F. Whidborne procured a rather large Terebratula-shaped shell, some- 

 what out of shape, compressed, and not sufficiently complete for safe specific identifica- 

 tion. In shape it is marginally elongated, oval, with moderately convex valves; beak 

 produced very slightly, incurved, and truncated by a circular foramen, which is separated 

 from the hinge-plate by a rather large deltidium. Surface smooth. 

 Length 16, breadth 9 lines. 



It differs from Ter. caiqua, de Vern., by its produced beak, foramen, and deltidium. 

 It is probably a new species, but I, have not thought it desirable to give it a name with 

 only one incomplete specimen at my disposal. 



