LAMELLIBRANCHIA TA. 
497 
Glossites lingualis, n. sp. 
PLATE XL, PIGS. 16, 19; and PLATE XCVI, FIGS. 9-11. 
In part Modiomorpha? amygdalina (Winciiell), Hall. Prelim. Notice Lamellibranchiata, 2, p. 78. 1870. 
“ “ “ “ “ Pal. N. Y., vol. v, pt. 1. Plates and Explana¬ 
tions : PL 40, fig-s. 12-20. 1883. 
Not Sanguinolites amygdalinus, Winciiell. Proc. Acad. Nat. Sci., Phila., p. 13. 1863. 
Shell of medium size or larger, elongate-sub-elliptical; length usually a little 
more than twice the height; basal margin gently curved. Posterior extrem¬ 
ity narrowly rounded. Cardinal margin slightly arcuate. Anterior end 
somewhat produced, declining from the beaks to about the middle of the 
height and abruptly rounded below. 
Yalves depressed-convex below the middle and on the posterior portion, 
becoming moderately convex in the umbonal region. 
Beaks at about the anterior fourth or fifth, small and closely appressed, 
not rising above the hinge-line. Umbonal slope not defined. Some speci¬ 
mens show a slight flattening or constriction of the valves extending from 
the beaks to the base. 
Test marked by fine striae of growth, which are often fasciculate on the 
body of the shell producing undulations of the surface. 
The cardinal border is distinctly flattened and there are indications of an 
elongate tooth posterior to the beaks. The upper anterior margin is also flat¬ 
tened in the cast, and this feature probably indicates the limits of the lunule. 
Pour specimens measure respectively 30, 32, 39 and 56 mm. in length, and 
14, 14, 18 and 25 mm. in height. 
This species is distinguished from G. depressus by its longer anterior end, 
more elongate elliptical form; and the cardinal line is not oblique, as in that 
species. 
Specimens are abundant in some parts of the Chemung group, and are sub¬ 
ject to considerable variation, due to the nature of the matrix and the condi¬ 
tion of preservation. 
Formation and localities. In the Chemung group at Phillipsburgh, N. Y., and 
at Mansfield, Pa. 
