392 THE PLAGIOSTOMIA. 



based and triangular tip; outer angles blunted, hinder broadly rounded. Mouth 

 small, abruptly curved, three papillae at the bottom. Teeth small, unequal, 

 flattened and in about thirty-seven rows on the upper jaw of a female eleven 

 inches and a half in width. Ventrals subtriangular, elongate anteriorly, broadly 

 rounded on hinder and inner margins. Tail very slender, much more than twice 

 the length of the body, with a narrow fin-fold below extending a short distance 

 behind the spine, and a low keel above. Top of head, middle of back, and the 

 tail rough with small spines; a vertebral series of tubercles with narrow depressed 

 and more or less elongate cusps, longer above the ventrals, a short scapular row 

 at each side near the vertebral series. Young smooth. 



Back brown, yellowish to olivaceous, uniform or spotted with darker; 

 lower surfaces white. 



Brazil to the West Indies. 



Amphotistius. 



A cutaneous fold below the tail and another above 



disk broader than long; no larger tubercles in a vertebral row 



sinensis (page 393) 

 disk broader than long; tubercles in vertebral row, narrow, depressed 

 tail about twice the length of the disk; 3 buccal papillae 

 back chocolate-brown; a median row of tubercles 



navarrae (page 393) 

 tail two and one fourth lengths of body; back rough; a median row of 

 tubercles 

 brown, olivaceous; a short fold above the tail, a longer below; 



seven papillae fluviorum (page 394) 



tail less than two lengths of disk ; buccal papillae 3 ; back roughened 

 brown, uniform to clouded; tubercles vertebral and humeral 



akajei (page 394) 

 tail about two lengths of disk; back smooth to rough; tubercles in a 

 vertebral row 

 brown with black-edged blue spots; buccal papillae 2 



kuhlii (page 395) 

 tail one and one half lengths of body; back smooth, a tubercle on 

 middle 

 brown, yellowish to dark; buccal papillae 5 . say (page 396) 



