578 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
CAMERELLA POLITA Billings 
Camerella polita B1ttines, Geol. Surv. Canada, Paleozoic fossils, vol. 1, pp. 304, 305, fig. 207, 
1865. 
Rhynchocamara polita (Billings) UtricH and Cooper, Geol. Soc. Amer. Special Pap. 13, 
p. 251, 1938. 
Types.—G.S.C. 
Horizon and locality—Mystic conglomerate, in Quebec, Canada: In Range 6, 
Lot 20, Stanbridge Township. 
CAMERELLA ? PRIMIGENIA (Bradley) 
Plate 109, G, figures 32-38 
Anastrophia primigenia BravLey, Contr. Walker Mus., vol. 2, No. 6, p. 228, pl. 23, figs. 9-12, 
1930. 
This species is a peculiar completely costate type of Camerella rather than an 
Anastrophia. Members of the latter genus usually have a well-marked fold and 
sulcus. But Bradley’s species is characterized as having the fold and sulcus visi- 
ble chiefly at the anterior commissure. A section of the interior of a brachial 
valve showed the characteristic cruralium of the Camerellidae and failed to show 
the peculiar alate plates that are diagnostic of Anastrophia. The species is there- 
fore best placed in Camerella until its true affinites can be determined. 
Types——Figured hypotypes: 111175a,b, 111177. 
Horizon and locality—Kimmswick formation in Arkansas: About 24 miles 
above the mouth of Cave Creek, 7 to 8 miles northwest of Batesville, Batesville 
(30’) Quadrangle. 
CAMERELLA PULCHRA Cooper, new species 
Plate 114, B, figures 25-34; plate 116, E, figures 35-39; plate 116, F, figures 40-46 
Shell of about medium size for the genus, longer than wide and with an elongate 
triangular outline; posterolateral margins long, forming an angle of about 80°. 
Greatest width in the anterior third and with narrowly rounded sides; anterior 
truncated. Anterior commissure somewhat narrowly but not strongly uniplicate. 
Surface costate except for smooth umbones; 3 costae on fold, 2 (occasionally 3) 
costae in sulcus, and 3 on the flanks. 
Pedicle valve gently but unevenly convex in lateral profile, the most convex 
part just posterior to the middle. Anterior profile fairly strongly convex ; umbonal 
region swollen ; sulcus originating on the anterior side of the umbo just posterior 
to the middle; sulcus shallow and narrow throughout its length; flanks narrowly 
convex and with steep sides. 
Brachial valve having a greater depth than the pedicle one, moderately con- 
vex in lateral profile ; strongly convex in anterior profile; umbonal and median 
regions swollen; fold conspicuous in the anterior half but not strongly elevated ; 
fold narrow ; flanks narrowly rounded and having steep slopes. 
