martin: new species of fish. 97 



the twenty-second to the thirty-seventh are missing entirely, 

 but from here on to the sixty-fifth the vertebrae connected with 

 the dorsal and anal fins are perfect. Twenty-five vertebrae 

 here rneasure 100 mm. All vertebrae are very constricted in 

 their center and are a little wider than long. 



The entire specimen is crushed laterally, leaving the dorsal 

 and anal fins in their natural position. The average distance 

 across from the upper edge of the dorsal fin to the lower edge 

 of the anal fin is 22 mm. At one point where the matrix has 

 flaked away there appear six or seven delicate ribs attached 

 to the underside of the vertebrae. 



The following measurements have been made: Length of 

 specimen from impression of first vertebra to the sixty-fifth 

 and last remaining vertebra, 255 mm. ; length of quadrate, 

 6 mm. 



DESCRIPTION OF PLATE VI. 

 Fig. 1. Photograph of entire specimen as preserved in the matrix. 



df. ^ Dorsal fin. 



af. = Anal fin. 



Bp. of Tf. = Basal plates of ventral fins. 



X. ^ Impressions of first vertebrae. 



Qd. = One quadrate 6 mm. long. 



Dent. = Portion of dentary. 



Fig. 2. Section of the hinder portion of the specimen, about natural 

 size. 



df. = Dorsal fin. 



af. ^ Anal fin. 



Br. of Tf. = Basal plates of ventral fins. 



Sci. Bui. — 800 



