154 



PALAEONTOLOGY OF NEW YORK. 



Genus CARDINOCRANIA, Waagen. 1885. 



1885. Cardinocrania, Waagbs. Mem. Geol. Surv. Imlia; Pjilaiout. Indioa, Ser. xiii, vol. i, iv (fas. 5), 



p. 745. 



Type, Cardinocrania Indica, Waagen, loc. cit., pi. Ixxxiv, 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 Ixxxiii, 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 narroAV and indented extremity to 

 not far from the front. It is supported in the middle by a low septum." 

 (Waagen, op. cil.) 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 \Vaagen. 



Figs. 73, 74. Inteiiois of attached valves. 



