LAMELLIBRANCHIA TA. 
415 
CONOCARDIUM RELIQUUM. 
PLATE LXVIII, FIG. 33. 
Conocardium reliqumn, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 68, fig. 33. 1S83 
The specimen is the impression of the posterior end, marked by tine radii. 
The original specimen is not accessible for description. A cast from the origi¬ 
nal is recorded as coming from the Chemung group. Locality unknown. 
Conocardium tegulum. 
PLATE LXVIII, FIGS. 30, 31. 
Conocardium tegulum, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 68, tigs. 30, 31. 1883. 
The original specimen is not accessible for description. The figures illustrate 
all that is known regarding its characters. The specimen is recorded as from 
the Niagara group. Locality unknown. 
Conocardium inceptum. 
PLATE LXVIII, FIG. 32. 
Conocardium inceptum, Hall. Pal. N. Y., vol. iii, p. 491. 1859. 
“ rugosum, “ Pal. N. Y., vol. v, pt. 1. Plates and Explanations : PI. 6S, fig. 32. 1883. 
Shell small, sub-ovate. Body of the shell gibbous or ventricose, marked by 
six or seven strong rounded plications. Posterior extremity truncate, its 
special characters unknown. Anterior end short, gaping; inner margin 
marked by a few strong denticulations. Surface of the anterior portion can¬ 
cellated by fine radiating and concentric striae, the latter extending over the 
strong plications and marking the interspaces. 
In the general surface characters it is very similar to C. denticulatum, but 
the anterior end is comparatively shorter and more abruptly contracted at 
the extremity ; the ribs on the body of the shell are more rounded. 
The specimen described has a length of 20 mm. 
Formation and locality. In the shaly limestone of the Lower Helderberg 
group, Albany county, N. Y. 
