PALJEONTOLOOY OF NEW-YORK. 



292. 3. ASAPHUS? EXTANS (n. *p.)- 

 Pi.. LX. Figs. 2, 2 a. 



Buckler unknown ; thorax with nine articulations visible, those of the lateral lobes 

 bifurcate or grooved ; coudal shield very convex, with the middle lobe very prominent and 

 terminating abruptly behind, the posterior extremity much elevated above the margin ; 

 the three anterior segments of (he middle lobe distinct, the posterior portion nearly smooth ; 

 lateral lobes each with five segments, the two last ones terminating in a thickened marginal 

 expansion, which extends beyond the middle lobe ; surface marked by fine imbricating 

 lamellose strife. 



Two individuals only have been seen, and both these are from the Birdseye limestone. 

 The fossil is remarkably distinct from the last, and is easily distinguished from any other 

 in the lower strata, by the prominent projecting central lobe of the caudal shield, and the 

 thickened margin. 



This species, having nine or more articulations of the thorax, varies from the true 

 AsAPH0s, and, in this and some other characters, approaches to Phacops. The caudal 

 shield, however, showing but three distinct articulations in the axis, has more the character 

 of AsAPHDs, to which genus I have provisionally referred the species. 



Fig. 2 a. A- caudal shield, b. Lateral view of the same. 



Fig. 2 c. Another fragment, showing nine articulations of the thorax. 



Position and locality. In the Birdseye limestone of the Mohawk valley, and in the same 

 position near Watertown. (Cabinet of John Gebhahd, Jr., and of Dr. Emmonb.) 



293. 1. CALYMENE MULTICOSTA (n. *;».). 



Pi.. LX. Fig. 3. 



Thorax and caudal shield with at least 25 articulations. 



The specimen is from the Birdseye limestone of He la Motte, and, though very obscure, 

 is evidently distinct from any thing we know in the older strata of New- York. The figure 

 is presented in the hope of calling attention to the occurrence of such a species, and the 

 explorations in Vermont will doubtless bring to light more specimens. 



Position and locality. Associated with lllcmtis and Orthoceras. He la Motte, Lake Cham- 

 plain. (State Collection.) 



