132 New Genera and Species of Brachiopoda. 



Centroxella glaxs-fagea, (Hall, Species.) 



Rhynchonella glansfagea, Hall. Report of the Regents of the 



University of the State of New York, 1857. Page 125. 



Description. — Shell, small, smooth, broad oval or rather sub- 

 rhomboidal, greatest width near the centre of the length of the 

 dorsal valve, from which point the sides slope in nearly straight 

 lines to the beak where they meet at an angle of about eighty- 

 five degrees ; front rounded or sometimes either a little pointed 

 or slightly sinuated. Ventral valve the larger, its outline forming 

 a nearly regular arch from the beak to the front margin, strongly 

 and broadly subcarinate along the centre, beak very prominent 

 and projecting over the dorsal valve at a right angle but not 

 much incurved at the point ; an open foramen beneath it. Dor- 

 sal valve somewhat flat, a wide shallow concavity extending from 

 near the beak to the front where it gently elevates the margin 

 of the ventral valve. Length from two to four lines, width about 

 the same. 



This little species is somewhat variable in form, the length being 

 sometimes greater than the width, and often a little less. The 

 broad shallow mesial depression of the dorsal valve sometimes 

 extends nearly to the beak, and in other specimens dies out at 

 two thirds the length. The detached dorsal valves also exhibit 

 two very thick and strong supports for the loop and between them 

 a deep fissure opm to the beak. 



Locality and formation. — Oriskany Sandstone, near Cayuga, C. 

 TV". Corniferous limestone at Rama's farm, near Port Colborne ; 

 abundant. In the State of New York it occurs in the Scho- 

 harie Grit. 



Genus Stricklaxdia, Billings. 



Generic Characters. — Shell, usually large, elongate oval, trans- 

 versely-oval, or circular, sometimes compressed; valves nearly 

 equal ; a short mesial septum in the interior of the ventral valve 

 supporting a small triangular chamber beneath the beak as in 

 Pentamerus ; in the dorsal valve no longitudinal septa spires or 

 loop, the whole of the internal solid organs consisting of two 

 very short or rudimentary dental plates, which in some species 

 bear prolonged calcified processes for the support of the cirrated 

 arms. In all the species the ventral valve has an area more or 

 less developed. 



This group of shells, although closely related to Penta- 



