PLATE I. 



Fig. 1. — Mijihuiri/goii acutulenn. Oiie-hall" natural sizi*. Krcim a sppciiueu m the possesBion of Prof. Leslie 



A. Li'i', of ISowdoiii Colle('t', Maine. 

 Fig. 2. — The teeth of the upper jaw somewhat <li8arranj{e<l, from below ; one of them showing the base ; 



twice nutnral size. 

 Fig. X — f)(i»ich-s of the sknll enlarged. 



Fig. 4 a and b. Sections of a candal spine at base and at middle. 

 Fig. .'». — One of the candal spines, from below, one and one-half times the natural size; a, section near 



the baM); b, section near the middle. 

 F'ig. ti. — Claile» cuneatun, two-thirds natural size. Pago 55. 

 Fig. 7. — I'rucacara tettudinaria, two-thicds natural size. Page 98. 



