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PALEONTOLOGY OF NEW-YORK. 
292. 3. ASAPHUS? EXTANS (n. sp.). 
Pu. LX. Figs. 2, 2 a. 
Buckler unknown; thorax with nine articulations visible, those of the lateral lobes 
bifureate or grooved ; caudal 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 the 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 striz. 
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 
Asapuus, and, in this and some other characters, approaches to Puacops. The caudal 
shield, however, showing but three distinct articulations in the axis, has more the character 
of Asapnus, to which genus I have provisionally referred the species. 
Fig. 2a. A caudal shield. 6. Lateral view of the same. 
Fig. 2c. 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 Joun Gesuarp, Jr., and of Dr. Emmons.) 
293. 1. CALYMENE MULTICOSTA (n. sp.). 
Pu. LX. Fig. 3. 
Thorax and caudal shield with at least 25 articulations. 
The specimen is from the Birdseye limestone of Ile 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 Illenus and Orthoceras. Ie la Motte, Lake Cham- 
plain. (State Collection.) 
