DISCUSSION OF SPECIES AXD THEIR DISTRIBUTION. 65 



The uppermost detached pectoral ray reaches beyond end of scales. The longest ventral ray 

 is three-sevenths of length without the caudal. Longest anal ray al>out one-half head. 

 Eadial formula: B. 12; D. 1, 14; A. 9; V. 2, 6; P. 2, 10; Sc. 6-60-8. 



MEASUREMENTS. 

 Millimeters. 



Length 243.00 



Height 31.13 



Thickness 20.08 



Head 45.18 



Millimeters. 



Caudal 58.24 



Snout 16.35 



Eye 3.06 



Interorbital space 16.35 



Batliypfcrois dubitis, of Vaillaut, is represented in his collections by seventy examples, 

 among which he recognizes a great amount of individual variatiou, and more than one 

 species may be included under this name. It resembles most closely B. hiujipes. 



Examples were taken off the coast of Morocco, in dej^ths ranging from 831 to 1,590 

 meters; off the Canaries, in 1,238 meters; off the Soudan coast, in 932 to 1,232 meters; on 

 the Arguin Bank, in depths of 1,113 to 1,495 meters, and at the Azores, in 1,257 to 1,412 

 meters. 



BATHYPTEROIS QUADRIFILIS, Gunther. (Figure 75.) 



Bathypterois quadrifilis, GCntheb, Ann. and Mag. Nat. Hist., 1878, ii, p. 184.— Challenger Report, xxil, 188, 

 pi. x.xxiii, tig. B. 



The uppermost and lowermost of the pectoral rays are fiUform, the former bifld for 

 more than two-thirds of its length, the latter simiile. Outer ventral rays much prolonged, 

 not dilated. Dorsal inserted close to root of ventrals. Adipose fin present. 



This species differs somewhat more from the preceding tlian these do among themselves. 

 The greatest depth of the body is one seventh of the total length, without caudal, the length 

 of the head nearly one-fifth. The head is remarkably flat above, and the width of the inter- 

 orbital space exceeds the length of the snout. The eye is small, but larger than in the pre- 

 ceding species, about oue-thml of the length of the snout, and one-fifth or one-sixth of the 

 length of the postorbital portion of the head. The dentition and branchial apparatus do 

 not olfer any noteworthy peculiarity. 



The dorsal fin occupies the middle between the extremity of the upper jaw and the root 

 of the caudal fin. A narrow adipose fin is present and midway between the dorsal and cau- 

 dal. The anal fin commences immediately behind the dorsal, its origin being equidistant 

 from the roots of the pectoral and caudal. Caudal fin emargiuate. 



The principal distinctive feature of this species is that it possesses not only the long 

 detached upper pectoral ray, but al.so an equally long lower ray, which, however, is not 

 removed from the remainder of the fin. The upper ray becomes bifid in its proximate third, 

 and is accompanied by an extremely short rudimentary second ray; it scarcely reaches to 

 the caudal fin and is shorter than the lowermost ray, which may reach to the end of the 

 caudal, and is split only at its very extremity. 



Tlie structure of the ventral fins is the same as in Bnthyptcrois longipes, but the strong 

 outer rays are .somewhat curved aiul do not reach the end of the anal. 



The scales are cycloid, as in the other species, but those behind the basal portion of the 

 pectoral fin are deeply pectinated, provided with from 5 to 10 long and narrow teeth, of 

 which the middle ones are the longest. (Gilnther.) 



Color blackish or black; pectoral filaments whitish. 



Radial formula: B. 12; D. 14; A. 9; P. 2-9; Y. 9; L. lat. 59. L. transv. 6 | 8. 



Tlie types of this specimen were obtained by the Cludlengir ofi' the coast of Brazil; two 

 specimens, one from station 12C, at a depth of 770 fathoms, one from station 121, at a depth 

 of 500 fathoms. 



The liJale obtained one specimen at station xcvin, off St. Vincent, at a depth of 513 

 fathoms. 



Two specimens, one of them G\ and the other 4i inches in length, were taken by the 

 AlhatroKK at station 23.S5, in 740 fathoms. Another (No. 34963, U. 6. X. M.), 6 inches in 

 length, at station 2117, in 683 fathoms. 

 19858— No. 2 5 



