DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 41 



B. Anal inserted f:ir beliind middle of iloisal. 



1. JIaxillary extending to below posterior third of orl)it. Scales moderate (70). Dorsal and anal 



n<'«ly equal in length. (D. 16; A. 17.) 15. mici:oi.ki'is 



2. Maxillary extending behind posterior margin of orbit. Seales small (c-a. 10.5 in lat. line). Dorsal 



longer than anal. (D. 14 ; A. 11. ) B. MKi..\N(>CEPHALr.s 



II. Dorsal and anal nearly opposite and eqnal in length or nearly so Tali-S.mania 



1. Maxillary extending about to vertical middle of orbit. 



a. Seales moderate (64 in lat. line). (D. IG; A. 17.) ...B. iioMoPTF.urs 



b. Scales rather large (about 50 in lateral line), D. 17-18; A. 17-lS B. .SQfAMosus 



1. Maxillary to vertical from anterior margin of orbit. (D.20; A. 22. ) B. antillarum 



2. Maxillary to vertical from posterior margin of orbit. (D. 22; A. 21.) B. .equ.a.toris 



BATHYTROCTES MACROLEPIS, GuNTHKR. (Figure 44). 

 BathytroctcB macrolepis, Gunther, Challenger Report, x.xii, 22.5, 1887. j)!. Lvii, fig. b (two views of head). 



A Bathytroetes with the dorsitl flu far in advance of the anal, and the maxiUary reach- 

 ing to below the posterior third of the orbit. Large scales and short vertical lins. The 

 height of the body i.s two-elevenths of its length; the head slightly more than one-third. 

 Head depressed, elongate, scaleless; broad across the occipital region, tapering forward ; its 

 upper surface deeply concave longitudinally. Eye large; its diameter greater than the 

 length of the snout and 3^ in length of head. Interorl)ital s])ace half the diameter of the 

 eye. Snout pointed. Jaws equal. Cleft of mouth rather wide; the maxillary extending 

 beyond the vertical from the center of the eye. Dentition weak; teeth small, equal, pointed, 

 nniserial; intermaxillary and front of maxillary toothless; vomerine teeth in two groups; 

 palatine teeth few, about 9. 



Vent al)out midway between the branchial opening and the caudal. The dorsal inser- 

 tion is in advance of the vertical from the vent, ;ind it last ray opposite the fourth ray of 

 the anal. Dorsal and anal both high in front. Pectoral lateral, its insertion oi)posite the 

 lower half of the gill opening. Pectoral with broad base, extending beyond the vent to the 

 end of the anal. Its insertion is midway between the root of the pectoral and the end of 

 the anal, and directly in ailvance of tlie vertical from the insertion of the dorsal. Scales 

 small, cych)id. Lateral line straight, with wide mucous apertures. Color, uniform black. 



Eadial formula: D. 15; A. 11; V. 8; L. lat. 42. 



A single specimen,!) inches in lengtli,in i)oor condition, was obtained by the ChaUenger 

 at station cxcviii, north of Celebes, at a depth of ISO fathoms. 



As the type of the genus its characters are here introduced, for purposes of-comjiarison. 



BATHYTROCTES ROSTRATUS, Gt ntiier. 



Bathytroctes roslratus, GiiNTHER, Ann. and Mag. Nat. Hist., Ii, 1878, 250; Challenger Report, XXII, 18S7. 227, 

 pi. Lviii, tig. 13. 



The maxillary reaches to below the hind margin of the orbit; internuixillary terminat- 

 ing in front in a short projection. 



The height of the body is nearly one-flfth of the total length (without caudal); the 

 length of the head one-third. Bones of the head very thin and very easily ruptured, like 

 all the other parts of the body. Head compressed, moderately deep, its d(>i>th at the occi- 

 put being three-flfths of its length; its upper surface longitudinally concave, the width of 

 the interorbital space being more than one-half of the longitudinal diameter of the eye. 

 Eye large, a little longer than deep, contained thrice and two-thirds in the length of the 

 head and equal to that of the snout. Infraorbital ring narrow, the broad and large maxil- 

 lary being separated from the orbit by a narrow strip of bone. Snout wedge-shai)ed, with 

 a pair of short and flat projections in front, each being Ibrmed by the intermaxillary and 

 toothed at its extremity. The cleft of the mouth is wide, the maxillary extending to below 

 the hind margin of the orbit. Dentition very feeble, all the teeth being miimte and nni- 

 serial. The intermaxillary and nnixillary are toothed throughout their whole extent; the 

 teeth of the mandible are particularly minute, and the series is interrupted close to the 

 syuiphysi-s, the symphyseal portion being external to the lateral porticm. which is implanted 



