[lambe] on AMYZON BREVIPINNE 153 



than those of most of the other species, but some of the fragments of the 

 collection indicate larger individuals." 



In the type specimen the caudal fin is missing, a few rays only 

 of the anal axe partially seen and the pectoral is poorly preserved. The 

 Horsefly river specimen is of about the same size as the type and is much 

 more perfect, giving details of the structure of all the fins, the vertebral 

 column and the scales. 



The Horsefly specimen may be described as follows: — Body fusi- 

 form, four times as long as high, with the greatest depth at the anterior 

 end of the dorsal fin. The head, including the opercular apparatus, is 

 equal to one-fourth of the entire length, thus equalling the maximum 

 depth. The anterior end of the dorsal fin is above a point midway 

 between the front end of the head and the posterior end of the vertebral 

 column. A line drawn vertically from the beginning of the dorsal 

 fin passes midway between the distal end of the pectoral fins (when 

 adpressed) and the proximal end of the ventrals. The pectoral fins 

 are well preserved and are nearly as long as the ventral fins which 

 equal in length the front ra5^s of the anal. The rays of the dorsal 

 fin are robust and long in front and rapidly decrease in size back- 

 ward, being very short and slender at the posterior end. The front 

 rays equal in length about two-thirds of the base of the fin whose 

 outline behind is slightly concave. The caudal fin has equal lobes 

 and is forked. The anal fin has rays that decrease in size rapidly 

 backward, its base being equal to about one-half the length of the 

 anterior rays; when adpressed this fin does not reach the caudal. There 

 16 a space between the posterior end of the base of the anal fin and 

 the caudal greater than the length of the base of the anal by one- 

 third. The ventral and pectoral fins are short-based and of nearly 

 equal size, the former when extended backward falling short of the 

 anterior end of the anal fin by a short dLstance. the posterior ends of 

 the latter being equally dn advance of the ventrals. There are about 

 thirty-four vertebra, of which about eighteen belong to the caudal 

 region. Eibs, stout and very long. Keural and hœmal spines long. 

 Numerous slender intermuscular bones, directed well backward, are 

 preserved anteriorly above, and in the caudal region both above and 

 below, the vertebral column. Cycloid scales cover the trunk. They are 

 small, three occupying a space of about 3 mm. in a row measured 

 obliquely upward and backward. Their exposed surfaces show fine 

 concentric lines and (?) extremely minute, close set horizontal lines. 

 The fin rays are branched and jointed. The interspinous bones (prox- 

 imal pterygiophores) supporting the dorsal and anal fins are well 

 developed, those of the anterior part of the dorsal fin reaching far 



