229 



the center in the brachial valve; interrupted radiating lines, 

 which form rows of elongated, Lachrymiform pustules. 

 Found in the Encrinal limestone, at Section ."> (common ). 



Genus CAMAROTCECH1A. Hall and Clarke. 



[Ety. : Samara, arched chamber.] 

 (1893: Pal. N. Y., Vol. VIII., Pt. II., p. 189.) 



Shell rhynchonelloid, trihedral in contour, with shallow 

 pedicle and convex brachial valve. No hinge area. Beak of 

 pedicle valve projecting and incurved. Surface radially pli- 

 cate, sinus and fold in pedicle and brachial valves respectively. 

 Distinctive internal characters (separating this genus from 

 other "Rhynchonellas") are: a median septum in the brach- 

 ial valve, which divides posteriorly, so as to form an elongate 

 cavity, which does not extend to the bottom of the valve. 

 No cardinal process. In the pedicle valve slender vertical 

 lamellae support the teeth. 



Camaeotcechia horsfordi. Hall. (Fig. 139.) (Pal. N.Y., 

 Vol. IV., p. 339, Pl.LIV.) 



Distinguishing Characters.— Transversely sub-elliptical 

 outline; nearly straight or broadly rounded front: length 



Fig. 139. Camorotcechia horsfordi. Cardinal, front, dorsal, ventral, and profile views 

 (from Hall). 



and width about as five to six or seven; sinus of pedicle 

 valve appearing first at about the middle of the shell, 

 abruptly curved upwards in front; mesial elevation of brach- 

 ial valve defined below the middle; fifteen to twenty-four 



