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, 
74inches. 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. Ditrema. 
minimum. Agassizii. 
arcuatum. anale. 
megalops. rhodoterum. 
