CHEIRACANTHUS LATUS. 



75 



The pedicle of the tail is very deep, and terminates in a broad fin, of 

 which the upper lobe greatly exceeds the lower lobe in extent. The 

 scales are smooth, umbonated below, and neatly sculptured on the 

 outer surface with four or five parallel grooves. They are of 

 uniform size over the entire body. The broad tail, large fins, and 

 close arrangement of these on the ventral surface distinguish this 

 species from all those hitherto described. 



Locality. — All the specimens I have seen of this species are from 

 Tynet Burn, where they occur in nodules similar to those found 

 in the contemporaneous deposit at Lethen Bar. 



Explanation of Plate X. 



Fig. 1. Cheiracanthus latus. Size of nature. 

 Fig. 2. Scales magnified. 



P. DE M. Geey Egerton, 



Oulton Farh, November 1860. 



