MUSEUM OF COMPARATIVE ZOOLOGY. 165 



The ventral well in advance of pectoral, close to humeral symphysis, the 

 rays being placed very close together at their origin, the length of the fin 

 (13 mm.) contained about 9 times in the total length, about 3 times in distance 

 from its origin to the vent. 



The caudal has about 10 rays ; its length is contained about 8 times in the 

 total length. 



Color, yellowish white, with a broad vertical band of black from the origin 

 of ventral nearly to the vent, another sinular and narrower band above it upon 

 each side. 



Bregmaceros atlanticus, n. sp. v 



Specimens were obtained by the " Blake " at the following stations : — 



xcix. Off Granada. 90 fathoms. 3 spec. 



cv. ? 11 " 



cxiii. OffNeris. 305 fathoms. 1 « 



CLXXXV. Lat. 25° 33' N. Long. 84" 21' W. 101 fathoms. 1 « 



The species agrees very closely with the only other known species of the 

 genus, B. macclellandii, Thompson (= Calloptilum mirum, Richards.), from the 

 Western Pacific, from which, however, it differs in the lesser number of rays 

 in the first anal, and in the greater height of the vertical fins (judging from 

 figures. 



The type (cv.) is 46 mm. long to base of caudal. Foiin compressed, mod- 

 erately elougate. Body height (6 mm.) 7f in its length. Interorbital area 

 convex, its width (2^ mm.) greater than diameter of eye (2 mm.), which is four 

 in length of head (8 mm.). Length of head 5| in total. Jaws even in front. 



Maxilla reaches to vertical through middle of eye ; the mandible to vertical 

 through its posterior margin. 



Teeth on intermaxillary minute, apparently in a single series, mandibulary 

 teeth biserial, the inner teeth enlarged. 



Scales large, about 10 in a transverse series, about 65 in a longitudinal 

 series. 



Cephalic appendage reaches nearly to base of first dorsal, its length (10 mm.) 

 4^ in total. 



Distance of dorsal from snout (17 mm.) 2J in total ; that of anal the same. 



The dorsal and anal fins received in a groove formed by the scales along 

 their bases. 



Anterior portion of second dorsal and second anal less elevated than in 

 B. macclellandii. The differentiations between the developed and undeveloped 

 rays of the anal are so slight that the limits of the so-called anterior and pos- 

 terior sections of the fin cannot be determined. 



Length of the longest anal ray (22 mm.) about 2 in body length. 



D. 1 + 15-16. A. 15-16 -h X (7 or 8) -^- 21-22. 



