298 



PALEONTOLOGY OF NEW-YORK. 



664. 5. CALYMENE CLINTONI. 



Pl. a LXVI. Fig. ba-d. 

 Heniicrypturus clintoni. Vaivuxem, Geol. Rep. 3d District, pag. 79, fig. 2, and p. 80. 



Buckler short, sublunate, width three or four times the length ; glabella four-lobed, narrower 

 in front, the posterior lobe larger than either of the others, and the anterior one scarcely larger 

 than the adjoining ones ; body broad above, middle lobe gradually diminishing towards the 

 caudal shield ; lateral lobes of nearly the same width as the middle lobe ; caudal shield 

 trilobate, the middle lobe with eight or nine articulations, the lateral ones smooth : surface 

 granulate 1 



The only specimen yet observed in a tolerably perfect condition is the one figured, the 

 caudal shield and cheeks being all that are usually found. The facial suture is nearly vertical 

 from each side of the glabella to the eye, where it turns and passes to the posterior angle, 

 apparently coming out upon the margin a little within the angle on the base of the shield. 

 The eye, judging from the base preserved on the cheek, is larger than usual in Calymene, 

 and the anterior part of the facial suture more directly vertical. The articulations of the ab- 

 domen are thirteen, as in Calymene ; but we have a peculiarity in the absence of articulations 

 on the lateral lobe of the caudal shield, which assimilates the species with Asaphus, or, we 

 should more properly say with Homalonotus, since the body has thirteen articulations. This 

 trilobite does not certainly belong to the Hemicbypturus of Green ; for the reasons that the 

 buckler of that genus is described as oculiferous, and not lobate, and the abdomen with eight 

 articulations. Moreover Green proposes to arrange under this genus " the Jisaphus expansus 

 of DalmaNj and several other known species," which, if allied to that genus, prove conclusively 

 that the present form should not be thus referred. The principal objection to a reference to the 

 Genus Calymene, arises from the smooth lateral lobes of the caudal shield ; since we do not 

 yet know the form and character of the eyes, except from the outline of the base on the cheek. 

 Nevertheless there appears to me no greater objection to admitting a species with this character 

 under Calymene, than to admitting species with articulate and non-articulate caudal shields 

 under the same genus, as in Homalonotus, 



Fig. 5 a. An individual having the cheeks partially separated at the sutures, and crushed. The 



glabella and lower portion of the buckler are in a state of good preservation. 

 Fig. 5 b. A profile view of the same. 



Fig. 5 c. A cheek of a larger individual separated from the buckler. 

 Fig. 5 d. A caudal shield of a large individual in the iron ore. 



Position and locality. This species appears in fragments in the iron ore on Steele's creek 

 in Herkimer county, and in numerous other localities between this point and Wayne county. 

 The nearly entire specimen was found at Martville, Cayuga county, in the green shale in the 

 higher part of the group. 



