884 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 
Brachial valve gently concave in the posterior half, deepest just anterior to 
the middle and with the anterior margin moderately strongly bent toward the 
brachial valve ; sides more gently deflected in the direction of the brachial valve 
than the front margin. Interior with cardinalia somewhat thickened ; adductor 
field triangular, thickened, with apex directed anteriorly ; adductors separated 
by a low median ridge. 
Measurements in mm.— 
Brachial Hinge Thick- 
Length length Midwidth width ness Height 
Paratype (117855b).. ? 10.8 13.1 13.5 ? ? 
a (117855g).. 12.0 ? 13.2 12.5 B 4.9 
Types.—Holotype: 117855e; figured paratypes: 117855f-h; unfigured para- 
types: 117855a-d. 
Horizon and locality.—Effna-Rich Valley formations in Virginia: At the Por- 
terfield Quarry, 5 miles east of Saltville, Maccrady (T.V.A. 218-NW) Quad- 
rangle. 
Discussion.—As its name implies this is a species of small size characterized 
by deep concavity and squarish outline. It is most like G. sculpturata but is 
smaller, more deeply concave, and with a more strongly convex pedicle valve. 
GLYPTOMENA ? PRISCA (Raymond) 
Plate 235, A, figure 1; plate 235, D, figures 3, 4 
Strophomena prisca RayMonp, Amer. Journ. Sci., ser. 4, vol. 20, p. 369, 1905; Ann. Carnegie 
Mus., vol. 7, No. 2, p. 234, pl. 35, figs. 2, 3, IQII. 
The types of this little species are poorly preserved but they show clearly 
that the species must have had a concavo-convex shell quite unlike that of 
Strophomena. The interior of this species is not known, and the specimens in 
the National Museum show none of these essential details. 
The pedicle valve assigned to this species has low convexity but with the me- 
dian region somewhat narrowly swollen. The lateral slopes are long and gentle. 
The costellae of this valve appear somewhat more crowded than those of the 
brachial valve and number 3 or 4 of the stronger ones at the front margin. 
The brachial valve has a well-defined sulcus beginning at the umbo and defin- 
able nearly to the anterior margin. The costellae of this valve are more definitely 
zoned with 2 of the stronger costellae in 1 mm. 
Measurements in mm.— 
Brachial Hinge Thick- 
Length length Midwidth width ness Height 
Hypotype (117854a).. ? 10.6 14.0 12.4 ? ? 
re (117853)... 13.9 ? 15.8 15.3 ? 1.9 
Types.—Holotype: Carnegie Mus. 5464; figured hypotypes: 117853, 117854a. 
Horizon and locality—Crown Point formation in New York: On Valcour 
Island, Plattsburg (15’) Quadrangle. 
Same formation in Vermont: On Fort Cassin and Appleton Point near Fort 
Cassin, Port Henry (15’) Quadrangle. 
