349 Bulletin 5 79 



CRixoiDEA. 291 



by small valvular pieces, its inferior side resting 

 on the superior angle of one of the scapulars. 



Longitudinal diameter from three quarters to 

 one inch and a half ; transverse diameter from 

 seven-tenths to one inch and two-fifths. 



2. C. loricatus. Costals, five pentagonal, and 

 one hexagonal. 



Resembles the preceding, but there is only one 

 hexagonal costal plate, and one interscapular plate. 



Longitudinal diameter one inch and eleven- 

 twentieths ; transverse diameter one inch and 

 three-tenths. 



Dr. Bigsby obtained seven specimens of the 

 orfiata and one of the loricata. He informs me 

 that "they are found loose in brown clay at the 

 foot of the ravine at Lockport, in which the New- 

 York canal mounts the parallel ridge of Lake On- 

 tario. They are extremely numerous, but almost 

 always worn and crushed. They are filled with 

 the clay in which they are , imbedded. They are 

 from one-tenth to one-eighth of an inch thick in 

 their parietes. The clay rests upon horizontal, 

 black, conchiferous limestone, in which I found 

 part of an encrinital stomach, bearing a close, if 

 not perfect resemblance to the Caryocrinites de- 

 scribed by Mr. Say." 



In the second volume of Silliman's Journal, p. 

 36, I instituted a new genus for the truly singular 

 animal reliquitun, which Parkinson called Ken- 



[J. A. N. S., Phila., ist Sen, Vol. IV, 1825.] 



