NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT I47 



STENOSCISMA HUECONIANUM (Girty) 

 Plate 19, figs. 1-lb 



Camarophoria hueconiana GIRTY, G. H., 1929, Journ. Wash. Acad. Sci., vol. 19, 



No. 18, p. 412, 414, figs. 14-21. 

 Camarophoria deloi KING, R. E., 1931, Univ. Texas Bull. 3042, p. 110, pi. 34, 



fig. 24 (holotype) ; STAINBROOK, M. A. and MADERA, R. F., 1941, Journ. 



Paleontology, vol. 15, No. 4, p. 378, pi. 55, figs. 15-27. 



Shell small for genus ; outline transversely subelliptical to subpen- 

 tagonal or trigonal, sides diverging between 70 and 105 degrees, maxi- 

 mum width located anterior to midlength of shell ; profile strongly bi- 

 convex; commissure uniplicate, fold low to moderately high, broad, 

 beginning about 5 mm. anterior to brachial beak ; sulcus very shallow, 

 beginning 5-7 mm. anterior to pedicle beak. Costae strong, sharp to 

 blunt, commonly bifurcating on fold or sulcus, beginning 3-5 mm. an- 

 terior to beaks, numbering from three to five (normally five) on fold, 

 one less in sulcus, three to five on each flank ; stolidium rudimentary or 

 absent ; growth lines faint. 



Pedicle valve moderately convex transversely, strongly convex lon- 

 gitudinally through sulcus; beak relatively long, moderately strongly 

 hooked but not normally pressed against brachial umbonal region; 

 posterolateral flanges broad, covered by edge of brachial valve ; del- 

 thyrium broadly triangular, normally without deltidial plates, leaving 

 large open foramen. 



Brachial valve strongly convex transversely, less strongly convex 

 longitudinally along crest of fold; beak bluntly pointed, apex within 

 pedicle valve. 



Pedicle valve interior with hinge teeth fused to sides of valve ; dental 

 plates converging just above floor of valve to form boat-shaped spon- 

 dylium, fused together beneath spondylium forming low median sep- 

 tum extending slightly anterior to spondylium ; apical region between 

 spondylium and side of valve may be filled with shell material. Muscle 

 marks in anterior two-thirds of spondylium, faint and undifferentiated, 

 set off from posterior third by sharp line ; pallial marks on floor of 

 valve, vascula media diverging at straight angle from forward edge of 

 median septum, crossing valve to sides ; marks of gonocoels posterior 

 to transverse vascula, on floor of valve beside spondylium. 



Brachial valve interior with broadly triangular to crescentic hinge 

 plate, thickened at apex to form cardinal process ; hinge sockets short, 

 located at lateral extremities of hinge plate ; crural bases extending 

 forward from base of cardinal process, space between them filled by 

 crural plates, joining them to top of intercamarophorial plate; crural 

 processes continuing free beyond crural bases, outwardly bowed and 

 ventrally bent, conforming to shape of edge of camarophorium ; median 



