Jordan and Evcriiuinn. — Pishes of JVorth America. 607 



subopercle enlarged and partly usurping the usual position of the pre- 

 opercle, in company with the suborbital chain, which is extended back- 

 ward to the opercular margin. Bones of head unarmed. Gills 4, a slit 

 behind the fourth. Pseudobranchia! none; gill rakers short; gill mem- 

 branes separate from the istbnms. Branchiostegals numerous (about 14). 

 Dorsal fin short, rather high, inserted behind ventrals and before vent; 

 no adipose fin ; no caudal fin ; anal fin extremely long, extending from 

 vent to tip of tail (its rays about 200 in number) ; ventrals mod- 

 erate, not very far back ; pectorals rather long, narrow, inserted 

 high. No axillary scales. Shoulder girdle weak, its uppermost bone 

 (supraclavicle or post-temporal) touching the cranium at the nuchal 

 region, but not connected with it laterally. Air bladder large, simple. 

 Stomach cajcal ; pyloric coeca in moderate number; intestines short. 

 Ovaries not closed. Vertebra) very many, 60 -fx. Three genera, with 

 about 10 known species. Fishes of the deep sea. {Haloaauridw, Giinther, 

 Cat. VII, 482, 1868.) 



a. Ventrals normal; no second ilorsal fin. 



b. Vertex covered with scales; scales of lateral line scarcely enlarged; snout obtusely 



rounded; anal Ligb. Halosaurl'S, 292. 



bb. Vertex scaleless; scales of lateral line enlarged, iiroviiled witb jihotopbores; snout 



pointed; anal moderate. .^lukovandia, 293. 



292. HALOSAURUS, Johnson. 



Halosamiis, Johnson, Proc. Zoiil. Soc. London, 1863, 40G, (oueHi). 



Ventrals normal; no second dorsal fin; anal high. Snout obtusely 

 rounded. Head without angular ridges. Vertex covered with scales. 

 Scales of lateral line scarcely enlarged. Characters otherwise included 

 above, (a/^csea; anFpof, lizard.) 



a. Preoral portion of snout equal to balf its leugtb. Heigbt of body nearly equal to half 



length of bead and ^'^ of total; diameter of eye g postorbital portion of head and much 



greater than width of interorbital space; about 60 scales in lateral lino in front of 



vent. OWEN I, 905. 



aa. Preoral portion of snout lees than half its length; height of body about ^.5 length of head 



and n'5 of total; diameter of eye half length of postorbital portion of head (which is 



equal to tl)at of snout), and much greater than width of interorbital space; about 67 



scales ia lateral line in front of vent. guntheri, 906. 



905. HALOSAURUS OWENI, Johnson. 



Head 7i. B. 14; D. 11; A. 191; P. 11;" V. 10; scales about 14-170-6. 

 Height 14 L in total length ; eye 2 in snout, 5 in head, reaching to profile; 

 siiout produced, its preoral portion being nearly i its length. Eye rather 

 large, f, postocular portion of head, and much more than width of inter- 

 orbital space; maxillary reaching vertical from front of eye. Length 

 of head more than its distance from ventral tin, the base of which is 

 entirely in front of and somewhat remote from base of dorsal ; pectoral 

 fin with narrow base, very long, extending nearly to root of ventral. 

 Scales of lateral line scarcely larger than the others, without phospho- 

 rescent organs being visible in the only specimen knoAvn ; anterior por- 

 tion of dorsal fin covered with small scales ; anal fin scaleless. Brownish 



