39 



but little doubt that they were derived from the same 

 place. 



CALYMENE MACROPHTHALMA.* Brongniart. Cast No. 9. 



Clypeo antice, caudaque postice attenuatis, oculis 

 magnis exsertis. 



This species, according to Al. Brongniart, who first 

 described it, is remarkable for the magnitude and 

 protuberance of its eye-shaped tubercles, and by the 

 prolongation of the anterior portion of the buckler, 

 in the form of a snout. 



The back is marked by .12 or 13 articulations, 

 which are thicker than those of the tail. The tail is 

 short, pointed, and without expansion. 



The middle lobe, or front of the buckler, in this 

 calymene, is said by Brongniart to be marked on 

 its sides by three oblique plicae or wrinkles, but we 

 have not been able to discover this character in any 

 of the specimens to which we have access; neither 

 do they exhibit any remarkable prolongation in the 

 anterior portion of the buckler, as stated in his spe- 

 cific character. The specimens which we have exa- 

 mined, agree pretty well with the representation he 

 has given of the C. Macrophthalma, Plate I. fig. 5. A. 

 B. Sc C. made from a drawing by Mr. Stokes, from 

 a fossil found in Coalbrookdale, (Eng.) 



This trilobite is common in several parts of the 



* From the Greek for " Great eyes." 



