354 APPENDIX. 



Ditrema brevipinnes. (Sp. ch.) 



The three posterior dorsal spines are the longest ; a 

 little shorter than the anterior rays. Scales on the 

 cheeks in two series. The length of the body is one- 

 third of the total length (without caudal). Jaws equal 

 in length anteriorly ; lips thin, the fold of the lower 

 being interrupted in the middle. The maxillary does not 

 quite extend to the anterior margin of the eye. Length, 

 7 inches. Head somewhat longer than high, its length 

 being nearly one-fourth of the total (without caudal). 

 The upper profile is somewhat concave above the eye. 

 The diameter of the orbit equals the extent of the 

 snout, and is two-sevenths of the length of the head : 

 cleft of the mouth oblique ; tusk rather small, in a 

 single series. The scaly part of the cheek is narrower 

 than the orbit. The dorsal commences vertically above 

 the root of the ventral ; the first spine is very short, 

 the three following increase in length ; the three last, 

 being longest, of nearly equal length, half as long as 

 the head ; the anterior rays a little longer than the last 

 spine. The anal fin commences below the seventh 

 dorsal ray, and extends further backwards than the 

 dorsal fin, its spines being very distinct; caudal emargin- 

 ate. Back, dark greenish olive; belly, silvery. 



I obtained this little species in Esquimalt Harbour, 

 but it has the same range and general distribution as 

 the others. Vide Vol. I. 



Ditrema. 



minimum, 

 arcuatum. 

 megalops. 



Ditrema. 



Agassizii. 



anale. 



rhodoterum. 



