582 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
CAMERELLA TUMIDA Cooper, new species 
Plate 111, D, figures 36-40 
Shell small for the genus, globular in outline and profile; length, width and 
thickness nearly equal ; apical angle between 90° and 100°; sides rounded; front 
margin truncated; surface finely costate in the anterior half but smooth on the 
posterior half; 4 costae on the fold, 3 in the sulcus, and about 4 on the anterior 
side of the flanks. 
Pedicle valve with almost same depth as the brachial valve, moderately con- 
vex in lateral profile with a moderate bulge just posterior to the middle; umbo 
and median region inflated; sulcus originating at about the middle, shallow; 
tongue narrow, long and narrowly rounded, bent at right angles in a broad curve. 
Flanks narrowly rounded and with steep slopes. Beak strongly incurved. 
Brachial valve nearly flat in the median region in lateral profile but with the 
front truncated and the umbo inflated ; anterior profile forming a narrowly curved 
dome with a flattened top but with precipitous sides. Fold confined to the an- 
terior half where it is moderately elevated. Flanks narrowly rounded. 
Measurements in mm.—Holotype, length 7.1, brachial length 6.4, width 7.0, 
hinge width 2.0?, thickness 6.1. 
Type.—Holotype: 117146. 
Horizon and locality.—Table Head series (middle to lower) in Newfound- 
land: On Lower Head, 4 miles north of Cow Head. 
Discussion—This species is a small, compact form having most of the shell 
smooth. It is truncated at the front end and has a long, strongly geniculated 
tongue. It is somewhat like C. obesa but is more finely costate. It is also sug- 
gestive of Camerella ventricosa, but that species is larger and the tongue is not 
so strongly geniculated and the costae are stronger. 
CAMERELLA UMBONATA Cooper, new species 
Plate 108, G, figures 33-39 
Shell of about medium size for the genus, length and width about equal ; sub- 
circular in outline; sides somewhat rounded and front nearly straight; apical 
angle nearly 120°. Brachial valve considerably deeper than the pedicle one. 
Posterior half smooth, anterior half costate, 4 costae on the fold, 3 in the sulcus, 
and 2 on the flanks. 
Pedicle valve shallow, nearly flat in lateral profile ; anterior profile nearly flat ; 
umbo gently inflated ; sulcus originating at the middle, broad and shallow ; tongue 
long and broadly truncated; flanks narrow and flattened but with their antero- 
lateral edges deflected away from the commissure; beak low and broad, slightly 
depressed and not protruding to the level of the umbo. 
Brachial valve moderately convex but depressed anteriorly and with the umbo 
strongly swollen; anterior profile narrowly domed and with precipitous sides. 
Umbo and median region strongly inflated; fold prominent only in the anterior 
third where it is somewhat rounded in profile; flanks narrowly rounded. 
