69 



considerably from those of the I. gigas; and the 

 depth of the lateral lobes, which exceeds three-tenths 

 of an inch, would almost of itself determine it to be 

 a new species. The original, from which our cast 

 was taken, is in the cabinet of J. P. Wetherill. It 

 was found near Newport, Kentucky, and occurs in 

 argillaceous slate. The fossil is of a dirty yellow 

 colour. 



ISOTELUS CYCLOPS.* Green. Cast No. 24. Fig. 7. 



Clypeo antice attenuate, piano; oculis rotundis, 

 proximis; cauda ovata, acuminata. 



The head of this species is much more elongated 

 than it is in the two preceding species. The anterior 

 portion of the buckler is much prolonged. The eyes 

 are approximate, rounded, and near the posterior 

 edge of the head. The abdomen is furnished with 

 eight distinct articulations; the middle lobe is scarce- 

 ly broader than the lateral lobes; tail rather broader 

 than the head, and ovate; posterior termination more 

 rounded than the buckler. Length nearly three inches. 



The specimen from which our model was taken 

 belongs to the Albany Museum. No label is attach- 

 ed to it, but I was informed by Mr. Meach, one of 

 the proprietors, that it was found in the western part 

 of the State of New York. It is embedded in an ash- 

 coloured limestone. The specimen is a good deal 

 worn but the peculiar form of the eyes, and the nar- 



* From the Greek for " round eyes," 



