The E'ew Species of Brachiopoda. 363 



concentric lamellae. On the interior the pedicle-valve has mod- 

 erately strong teeth and a large flabellate muscular impression. 

 In the brachial valve the hinge-plate is divided into two flat 

 lobes, supported by a thickened median ridge extending nearly 

 the full length of the valve. 



Clinton group. In the drift of Western New Yorh. 



Glassia Romingeri. • 



Plate 9, figs. 38-36. 



Glassia Romingeri, Hall. Paleontology of N. Y., vol. VIII, pt. 2, p. 152, pi. 

 Ixxxiii, figs. 82-35. 1894. 



Shell small, subequally biconvex, obcordate in outline. Surface 

 smooth, with a median depression on both valves, which 

 gives the shell a bilobed appearance on the anterior margin and 

 over the anterior region. On the iuterior are introverted spirals 

 whose primary lamellae are united by a posterior jugum. 

 • Trenton limestone. I7i a drift houlder^ Ann Arhor, Michigan. 



Camarophoria rhomboidalis. 



Plate 9, figs. 37-40. 



Camarophoria rhomboidalis, Hall. Palaeontology of N. Y., vol. VIII, pt. 3, 

 p. 366, pi. Ixii, figs. 25-29. 1894. 



Shells of rather small size, subtriangular in outlineVith]cardinal 

 margins extending for half the length of the valves. Pedicle- 

 valve with apex scarcely elevated, incurved, withdeltidial plates 

 usually concealed; slightly convex about the umbo, broadly 

 depressed medially, forming a sinus which makes a linguiform 

 extension on the anterior margin. This sinus may bear one and 

 sometimes traces of two other low plications. The lateral slopes 

 are smooth, except at the margins, where there is faint- evidence 

 of one or two plications on each. The brachial valve is convex 

 and broadly rounded with abrupt umbo-lateral slopes ; broad, low 

 median fold, apparent only in the pallial region, and bearing a 

 median plication. Traces of two lateral plications are visible at 

 the margin of the valve, and these are some what ^'more distinct 

 on the surface than on the opposite valve. Surface smooth or 

 with fine concentric lines. The interior structure of the shell is 

 normal for this genus. 



Corniferous limestone. Cass county, Indiana, 



