NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA GRANT 121 



Phillips' specimens and from his own collections that C. globulinum in- 

 cluded specimens that Phillips had called Terebratula seminula. I ac- 

 cept his opinion in this matter, and include the name in the synonymy 

 of C. globulinum. 



COLEDIUM OBESUM (Clark) 



Plate 16, figs. 2-2c; figure 29 



Camarophoria obesa CLARK, T. H., 1917, Harvard Mus. Comp. Zoology, Bull. 



61, No. 9, p. 373, pi. 2, figs. 13-24, text fig. 3. 

 Stenoscisma obesa (Clark) EASTON, W. H., 1962, U.S. Geol. Survey Prof. 



Paper 348, p. 41, pi. 4, figs. 24-27. 

 NOT Stenocisma obesa (Clark) SHAW, A. B., 1962, Journ. Paleontology, vol. 



36, No. 4, p. 633, pi. 97, fig. 27-31 ; pi. 98, fig. 6-8, text fig. 1, (Atribonium aff. 



A. bisinuatum (Rowley)). 



Original description (Clark, 1917). — Shell small, subglobular in 

 form, subcircular to subpentagonal in outline, longer than wide, wider 

 than thick. Both valves are strongly convex; the pedicle valve is the 

 more strongly arched longitudinally, the brachial valve transversely. 

 In the pedicle valve the beak is prominent and overhangs the brachial 

 valve considerably. There is a distinct but not strongly marked sinus 

 on the pedicle valve, within which is a raised median plication. On 

 either side of the sinus are two plications, only the pair bordering the 

 sinus achieving any prominence; occasionally the only evidence of 

 the outer plication is a sinuosity in the lateral margin. The brachial 

 valve is characterized by a short and not prominent fold divided by 

 a median furrow. On each side there may be one or two short plica- 

 tions. The fold, sinus, and plications on both valves are short, not ex- 

 tending one half the length of the specimens. 



Internally, the pedicle valve shows a pair of dental lamellae near the 

 beak, supported by a median septum. The lamellae are continued an- 

 teriorly into a spondylium, well raised from the floor of the valve. The 

 brachial valve has a slightly longer median septum supporting both 

 hinge plate and cruralium (camarophorium). The hinge plate is short, 

 and the cruralium extends a short distance beyond the septum. 



The surface of the valve is unornamented save for lines of growth 

 at irregular intervals. 



Supplementary descriptive remarks. — The beak of the pedicle valve 

 is short and sharp, erect to slightly incurved ; the delthyrium is open, 

 normally not completely filled by the brachial umbo, and unobstructed 

 by deltidial plates ; the foramen penetrates the apex of the beak. De- 

 spite Clark's statement to the contrary, most specimens are nearly 

 equal in length and width, or slightly wider than long. 



The camarophorium of the brachial valve interior is short for the 



