BRACHIOPODA — TELOTREMATA. 



291 



by 25-35 simple angular plications of which 6-8 occupy fold and 

 sinus. 



Niagaran of Kentucky, Indiana. 



266. U. campbellanus (Hall). (Fig. 359.) Devonic. 



Laterally compressed. Width f length. Brachial valve the 



larger, elevated near front into a broad undefined mesial fold, 



curving abruptly at sides. Pedicle valve with a broad shallow 



Fig. 359. Uncinulus campbellanus (Pal. N. Y. , III.). 



sinus towards the front ; lateral margins of valve abruptly deflected 

 toward opposite valve, thus giving the sides of the shell a flat- 

 tened appearance. Surface marked by 20-26 simple plications. 

 Helderbergian (Becraft) of New York. 



267. U. nucleolatus Hall. (Fig. 360.) Devonic. 



Subspherical, declining towards the beak. Pedicle valve de- 

 pressed convex, abruptly deflected towards margins ; brachial 

 valve very convex anteriorly, depressed posteriorly. Surface 



Fig. 360. Uncinulus nucleolatus (Pal. N. Y., III.). 



marked by 15-23 simple plications about 4 or 5 of which, by 

 their slight elevation on the brachial valve and their depression on 

 the pedicle valve form a more or less distinct fold and sinus. 



Helderbergian (New Scotland) of Maine, New York, New Bruns- 

 wick. 



268. U. mutabilis Hall. (Fig. 361.) Devonic. 



Ovate to spherical. Beak of pedicle valve small, pointed and 



closely incurved over the opposite valve. Beak of brachial valve 



incurved beyond the hinge line. Cardinal border on each side of 



