Mleteroscymnus, 103 
short, thick, pointed ; upper outline steep, straight ; eye small, lateral, without nictitat- 
ing membrane ; spiracle smal', oval, behind eye; its horizontal diameter 234 in head, 
21 in horizontal dia 1eter of eye; distance between eye and spiracle 43 and that between 
spiracles 2% in head interorbital broad, convex ; snout rather short, depressed, pointed. 
Mouth inferior, but little arched ; its angle at a short distance behind eye ; a groove 
running backward from the mouth-angle a little less than one-third distance between 
mouth-ingle and first gill-opening; a similar but very short groove on upper lip. Lips 
thin, anterior margin of upper lip midway between anterior rim of eye and of pupil. 
Nostril much nearer to tip of snout than to mouth or eye, separated into anterior and 
posterior nostrils superficially by anterior and posterior flaps; anterior nostril 
oval ; posterior oblong and very narrow. Teeth in upper jaw lanceolate, sharp, 
irregularly close-set, in several rows, of which four are visible from outside, and about 
twenty ina row visible from outside ; those in lower jaw much larger, triangular, di- 
rected somewhat outward, without serration in margin, arranged in two rows about fifteen 
in a row being visible from outside (actual number 18). Gill-openings five in number, 
entirely in front of pectoral, posterior ones closer together than anterior ones ; 
last opening largest, 62 in head, first opening next to this in size and the rest subequal. 

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