NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT 1 55 



levigate anterior and anterolateral surfaces, each costa there deeply 

 grooved along crest, slightly extended at commissure to produce ser- 

 rated margin interlocking with serrations of opposite valve ; edges of 

 valves protruding to form rudimentary stolidium. Concentric orna- 

 mentation fine, normally showing best in troughs between costae; 

 growth laminae faintly visible. 



Pedicle valve flatly convex transversely, moderately convex longi- 

 tudinally through sulcus, abruptly flexed at anterior margin to form 

 levigate surfaces; beak long, somewhat attenuate, thickened, slightly 

 hooked, with obscure beak ridges ; posterolateral valve edges elongate, 

 narrow, covered by edges of brachial valve ; delthyrium triangular, 

 constricted by pair of small, disjunct deltidial plates, leaving elongate 

 foramen opening directly ventrally. 



Brachial valve moderately convex transversely flatly convex along 

 crest of fold, except for stronger convexity at somewhat swollen, at- 

 tenuate beak. 



Pedicle valve interior with small, denticulate hinge teeth, one fused 

 to each side; dental plates strong, converging just above floor to form 

 elongate, boatlike spondylium, continuing to floor as low median sep- 

 tum; floor may be thickened, hiding septum. Muscle marks in spon- 

 dylium and pallial troughs and trunks as described for genus. 



Brachial valve interior with triangular to crescentic hinge plate, 

 greatly thickened at apex to form large, knoblike cardinal process, 

 serrated for muscle insertion ; hinge sockets at lateral extremes of plate, 

 wide, deep, short, coarsely denticulate ; crural bases extending forward 

 from near base of cardinal process, space between filled by callous or 

 plate attaching to top of intercamarophorial plate ; crural processes ex- 

 tending free, outwardly and ventrally bent to conform to outline of top 

 of camarophorium ; median septum high, thin, rather short on floor, 

 length increasing slightly with height; camarophorium large, spoon- 

 shaped, deep, with short intercamarophorial plate. Muscle marks in 

 camarophorium and pallial marks on floor as described for genus. 



Holotype. — King, 1931, plate 35, fig. 6 (Tex. Bur. Econ. Geol. No. 

 10167). 



Comparisons. — Torynechus caelatus is characterized by its fine, 

 blunt costae that normally add anteriorly by intercalation, attenuate 

 beaks, somewhat swollen brachial beak, and levigate anterior that does 

 not extend far along the sides toward the posterior. The blunt, nor- 

 mally intercalating costae, more swollen brachial beak, and less ex- 

 tensive levigate region distinguish it from another less abundant species 

 that also occurs in the Leonard of the Glass Mountains, Tex. 



Occurrence and abundance. — Torynechus caelatus has been found in 

 the Leonard Formation in the Glass Mountains, Tex. Nearly 50 speci- 



