Weller — ParapJiorJvjnchus, Genus of Kinderhook Bruchiopoda. 261 



into the cavity of the shell as a crural process, and the 

 median septum also continues forward towards the front of 

 the shell beyond the cruralium-like hinge-plate. Cardinal 

 process wanting. Shell structure fibrous, not punctate. 



The members of this genus differ exteriorly from Pugnax 

 with which they have usually been placed, in the longitudi- 

 nally striated shell surface, and in the more strongly plicated 

 shell with the plications extending nearly to the beak. In- 

 ternally the characters of the shell resemble Camarotoechia 

 rather than Pugnax, the strong median septum of the brachial 

 valve with its cruralium-like hinge-plate being absent in the 

 typical forms of Pugnax. 



Paraphorhtnchus elongatum, n. sp. 



PL 1. f. 1-5. 



Shell lonjrer than wide, broadest in front of the middle, 

 in the posterior region both valves are convex, the fold and 

 sinus of the mature shell originating at or back of the middle 

 of the shell, in the posterior half of the shell the lateral sur- 

 faces are flattened and non-plicate, the flattened area becom- 

 ing concave as it approaches the beaks, the line of junction 

 between the two valves being in the bottom of the concavity. 

 The coarser surface markings consist of from ten to fourteen 

 rounded radiating plications, twelve being the usual number, 

 with a few concentric lines of growth which are often nearly 

 or quite obsolete. In rare instances one of the radiating 

 plications is seen to bifurcate in the anterior portion of the 

 shell. The five median plications are usually depressed in the 

 sinus of the pedicle valve with a corresponding number ele- 

 vated in the fold of the brachial valve, the two lateral plica- 

 tions in both fold and sinus frequently becoming obsolete 

 before reaching the anterior margin. The minute surface 

 markings consist of fine radiating striae and still finer 

 concentric striae. The radiating striae can be clearly seen 

 with the naked eye, four or five of them occupying the space 

 of one millimeter, they are nearly or quite obsolete upon the 

 flattened lateral surfaces of the valves. The concentric 

 striae are much finer and can only be seen with the aid of a 



