CLINTON GROUP. 



29t 



TRILOBITES OF THE CLINTON GROUP. 



Genus CYBELE (Loven). 

 ENCRINURUS, Emmerich. 

 This genus was described, at about the same time, under the name of Encrinurus by 

 Emmerich, and Cybele by Loven. The latter name is, on many accounts, preferable ; and is 

 likewise accompanied by a more full description, and with good illustrative figures. 



663. 1. CYBELE PUNCTATA. 



Pl. a LXVI. Fig. la-k. , 



For references, etc., see page 245, Vol. i, Pal. N. Y*. 



Buckler semicircular or subcrescentiform, the posterior angles extended into long spines ; 

 glabella clavate, not lobed ; surface of glabella and cheeks tuberculous ; body composed of 

 eleven articulations ; caudal shield with seven to nine articulations in the lateral lobes, and 

 twenty-one in the middle lobe ; every fourth or fifth articulation of the middle lobe tubercu- 

 lated ; each of the lateral articulations more or less distinctly tuberculated ; oculiform tubercles 

 prominent. 



This species usually occurs in fragments, the caudal shields and imperfect bucklers alone 

 being found, except in rare instances. I have seen two individuals in a tolerably perfect con- 

 dition, but the surface is so much injured that the markings are nearly obliterated. These 

 individuals are larger, and of somewhat different proportions from the Trenton limestone 

 specimens. The number of articulations in the middle lobe of the caudal shield is greater than 

 in the Trenton species ; and there are other characters, which, a comparison of specimens 

 induces me to believe, warrant the separation. 



Fig. 1 a. An individual nearly entire, showing the proportion of parts. The glabella is erroneously 

 represented in the engraving as being lobed, while it is only tuberculated. 



Fig. 1 b, c. The glabella and base of buckler of two individuals of different size. 



Fig. 1 d. The cheek separated at the facial suture. 



Fig. 1 e. Profile of glabella, showing the strong indentations at the base. 



Fig. 1 /. An enlarged portion, showing the prominent tubercles. These specimens are all casts, 

 so that the character of the tubercles in their original condition is not fully known. 



Fig. 1 g, h. The caudal shields (imperfect at the extremities) of two individuals. 



Fig. 1 i, A small individual. 



Fig. 1 k. An enlargement of several articulations of the caudal shield. 



Position and locality. The fragments of this species have been found principally in the 



neighborhood of Medina, Orleans county. The entire individual is from Reynale's basin, Niagara 



county. 



* At the time I published the description of the allred species from the Trenton limestone, I was induced to refe, 

 it to the Genus Ceratjrus, from certain characters which it possesses in common with that genus. 

 [PALiEONTOLOGY VoL. II.] 38* 



