ON AMPHICENTBUM STRIATUM. 415 



being a little wider than long, measured from angle to angle ; 

 the dorsal and ventral angles are not much produced. The head 

 is small and conical, with the muzzle forming the anterior angle ; 

 the upper and lower margins are continuous with the dorsal and 

 ventral lines of the trunk. The cranial bones are too much dis- 

 turbed to admit of particular description ; they are, however, 

 covered with a lustrous enamel, and are ornamented with strong 

 striae and tubercles, which irregularly run into each other. The 

 fins are almost entirely wanting in our specimens ; only one of 

 them shows a little of the dorsal, which appears to be very deli- 

 cate ; and another a portion of the caudal. 



The scales are well preserved in three or four specimens. 

 They are oblong, perhaps somewhat rhomboidal, and are much 

 longer than wide ; the peg is long ; they become smaller towards 

 the dorsal and ventral margins of the trunk, where they are 

 strongly tuberculated : the large central scales, of which there 

 are three series in depth, have their extremities also a little tu- 

 berculated ; but their middle and greater portions are covered 

 with strong, somewhat irregular, raised, longitudinal stria? ; so 

 that the trunk of the fish has tuberculated dorsal and ventral 

 belts, with the central portion striated. 



The V-like arrangement of the dental tubercles, so far as we 

 have been able to examine it, is the same as in A. granulation ; 

 and the mandibular dental plates, which are frequently found 

 detached, do not seen to differ in any important respect from 

 those of that species, size being the chief distinguishing feature. 

 The length of the body, including the head, is two inches, and 

 its depth from the dorsal to the ventral angle an inch and three- 

 quarters. 



This is a very beautiful species, and is at once distinguished 

 from its congener by its small size, and particularly by the striae 

 on the middle portion of the body, which ornamentation con- 

 trasts well with the strong marginal tubercles, the whole being 

 coated with brilliant enamel. 



