BRACHIOPODA — TELOTREMATA. 



293 



270. U. vellicatus Hall. (Fig. 363.) Devonic. 



Pedicle valve depressed-convex. Brachial valve gibbous in 

 front, depressed and rounded toward the beak. Surface with 24 

 to 36 plications of which 6 to 8 

 occupy fold and 5 to 7 the sinus. 

 Differs from U. abruptus in its 

 smaller size, its smaller and more 

 numerous plications; aiso in being 

 less ventricose, due to its narrower 

 and more pronounced median si- 

 nus and fold and its posteriorly less 

 convex brachial valve. 



Helderbergian (New Scotland) of 

 New York and New Brunswick. 



Fig. 

 N. Y.. 



363. Uncinulns vellicatus (Pal. 

 III.). 



Fig. 364. Uncinulus nobilis (Pal. N. Y.,1IL). 



271. U. nobilis Hall. (Fig. 364.) Devonic. 

 Pedicle valve depressed convex ; brachial valve declining later- 

 ally with an abrupt curve to meet the inflected margin of the ped- 

 icle valve ; its umbo rather 

 prominent and incurved. 

 Surface marked with 26 to 

 32 strong, angular plica- 

 tions, six to eight of which 

 occupy the rounded mesial 

 fold and 5 to 7 the rounded 

 sinus. This species is more 

 elongate than U. abruptus 



and less than U. campbellanus. 



Helderbergian (Becraft) of New York and Pennsylvania. 



LXXX. Wilsonia Kayser. 



Hingeplate small, divided by a shallow median incision; no car- 

 dinal process; otherwise like Uncinulus, from which it is indistin- 

 guishable by external characters. Siluric to Devonic. 



272. W. ventricosa (Hall). (Fig. 365.) Devonic. 

 Spheroidal, ventricose. Cardinal region on each side of the beak 



elevated. Beak of pedicle valve rather small and obtuse, closely in. 

 curved. Surface with 14 to 20 low, rounded plications. Very in- 

 conspicuous sinus and fold at times present, occupied by two to 

 four plications. Front of plications marked by a longitudinal 



