ee 
70 CRETACEOUS GROUP 
BRACHIOPODA. 
TEREBRATULA, Lam. 
1. T. Harlani, (S.G.M.) PI. iii, fig. 1, and pl. ix, 
fig. 8 and 9. | 
Amer. Journ. Science, vol. xviii, pl. iii, fig. 16; Journ. 
Acad. Nat. Sciences of Philad. vol. vi, pl. iii. 
Specific character. Thick, elongated; upper valve convex, 
biplicated at the margin; lower valve very convex, with a lon- 
gitudinal ridge, and slight lateral depressions; beak incurved. 
Length, from one to three inches. 
Abundant at Egypt and other places in New Jersey, in 
the arenaceous strata. 
Var. A. Rectilateral. PI. ix, fig. 9. 
Var. B. Discoidal. PI. ix, fig. 8. 
Notwithstanding the difference between var. B. and 
the usual forms of 'T. Harlanz, I am not willing to consi- 
der it a distinct species, inasmuch as it appears to pass by 
insensible degrees into the other varieties. It is figured 
in the Journ. Acad. Nat. Sciences, vol. vi, pl. i), fig. 7 
and 8, and there provisionally referred to T. perovalis, 
of Sowerby, from which it is altogether distinct. If it 
should not prove to be a variety of T. Harlani, I propose 
for it the name of T. camella. 
2. T. fragilis, (S.G.M.) Pl. im, fig. 2. 
Specific character. Very thin, fragile; rectilateral, sides 
parallel; upper valve sub-convex, with two longitudinal 
ridges almost its whole length, forming a deep biplication; in- 
ferior valve very convex, with a prominent central ridge and 
corresponding lateral depressions. 

