2'2'.) 



the center in the liracliial vnlve: inteiTUpted radiatinu' line«, 

 wliieh form rows of ek)n,ii,ate(l. lachrvniiforni pustules. 

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



Genus CAMAROTdX'HiA. Haij. and Ci.aijki:. 



[Ety. : Ktniiairi, arched cliainber.] 

 (1893: Pal. X. Y., Vol. VIII., Pt. II., p. 1S9.) 



Shell rhvnclionelloid, trihedral in contour, with shallow 

 pedicle and convex brachial valve. No hin<j:,e 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 p()steriorl3^ so as to form an elongate 

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

 No cardinal process. In the ])edicle valve slender vertical 

 lamellfT^ support the teeth. 



Ca.makotcechia HORSFORDi. Hall. (Fig. 131).) (Pal. X.Y., 

 Vol. IV., p. 330, PI. LIV.) 



Distinguishing Clmracttrs. — Transversely sub-elliptical 

 outline: nearly strai^-ht or broadlv rounded front: length 



Fk;. 139. Ccimarota'chia horsfvnii. Cardinal, front, dorsal, ventral, and profile views 

 (from Hall). 



and width al)Out as five to six or seven ; sinus of pedicJe 

 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 



