154 
PALEONTOLOGY OF NEW YORK. 
Genus CARDINOCRANIA, Waagen. 1885. 
1885. Cardinocrania, Waagen. Mem. Geol. Surv. India; Palseont. Indica, Ser. xiii, vol. i, iv (fas. 5), 
p. 745. 
Type, Cardinocrania Indica, Waagen, loc. cit., pi. lxxxiv, figs. 1, 2. 
These very peculiar shells, of which only attached valves are known, have a 
straight hinge-line which is set off from the remaining outline of the shell by 
strong post-lateral indentations, giving the 
valve somewhat the outline of the alate 
strophomenoids, or still more suggestive 
of the attached valve of Richthofenia (see 
figures of R. Lawrenciana, Koninck, op. cit., 
plate lxxxiii, figs. 1, a, b, c). This hinge, 
however, is always edentulous, and is an 
extreme specialization of the feature usually apparent as a transverse posterior 
line in most of the Cranias. “ In the interior of the valve the most conspicu¬ 
ous part is a thin, triangular shelly plate, fixed by its broad base to the cardinal 
region of the valve, and extending with its narrow and indented extremity to 
not far from the front. It is supported in the middle by a low septum.” 
(Waagen, op. cit.) The arrangement of the muscular scars has not been 
observed; notwithstanding, the known characters of the shells substantiate 
the generic difference from Crania. The single known species is from the 
Permo-Carboniferous beds of Salt-Range of India. 
Cardinocrania Indica , Waagen. 
After Waagen. 
Figs. 73, 74. Interiors of attached valves. 
