DISCUSSION OP SPECIES AND THEIR DISTRIBUTION. 421 



more than half as long a> the eye. The number of gill-rakers on tlii.s arch is 25, 20 being 

 below the angle. 



Pseudobranchise present, very rudimentary in some individuals, in others wanting or 

 present only upon one side. 



The first dorsal is distant from snout 68 millimeters, which is slightly more than 

 length of the head; the length of its base (24 millimeters) is abont equal to width of the 

 snout at the nostrils. The tin consists of - spines, the first of which is minute, and 9 

 branched rays. The length of the longest spine, which is armed, is contained twice in that 

 of the head (specimens examined impel feet). The second dorsal begins immediately behind 

 the first, the membrane being- continuous. The anterior rays are longest (apparently about 

 one-fourth the length of the head). 



The anal is lower than the second dorsal; its distance from the snout (112 millimeters) 

 is about equal to one-third of the total length. 



The pectoral is inserted under the anterior rays of the first dorsal and very slightly in 

 advance of the origin of the ventral. Its length is more than half that of the head. 



The distance of the ventral from the snout (69 millimeters) is contained 5 times in the 

 total. This fin is inserted nearly under the base of the pectoral; the first ray is somewhat 

 produced; its tip reaches to the fourth ray of the anal fin. 



Radial formula: D. n, 9, 125; A. 110; V. 9; P. 14; B. 7. 



Color, bluish-brown, darkest upon head and abdomen, especially in Museum specimens. 



The type specimen, 350 millimeters in length, was obtained by the Blake from station 

 lxxx, off Martinique, at a depth of 472 fathoms. 



Collateral types were secured by the Albatross from station 2302, in 28° 47' 30" N. lat., 

 87° 27' W. Ion., at a depth of 724 fathoms; from station 2394, in 28° 38' 30" N. lat., 87 

 02 YV. Ion., at a depth of 420 fathoms; and Cat. Nos. 341110,34911,34918, and 34920, U. 

 S. X. M., from station 2117, in 15° 24' 40" N. lat,, 03° 31' 40" W. lou., at a depth of 683 

 tat horns. The Blake also captured an individual at station lxxxii, iu 23° 48' N. lat,, 86° 

 10' 30" W. Ion., at a depth of 1,501 fathoms. 



BATHYGADITS ARCUATUS, Goode and Beau. 



Bathygadus arcuatus, Goode and Bean, Bull. Mns. Com]). Zool., xn, No. 5, 158. 



The body is shaped much as in Chalinura Simula, but the nape is still more convex. Its 

 greatest height (57 millimeters in the type specimen )-is 5'^ in its total length. The back is 

 gibbous, the dorsal outline rising rapidly from the interorbital region to the origin of the 

 first dorsal, whence it descends gradually to the end of the tail. 



The scales are moderate, cycloid, subovate, without armature; those of the abdominal 

 region and those above the pectorals the largest. The lateral line is strongly arched over 

 the pectorals; the length of the arched portion contained about 3^ times in the straight 

 portion; the greatest height of the arch is about one-fourth of the length of its chord. 

 The number of scales in the lateral line is about 140, eight rows of scales between the 

 origin of the dorsal and the arch of the lateral line, 13 or 14 rows of scales between the 

 vent and the lateral line counting backwards, 22 counting forwards. Scales cover all parts 

 of the head except the jaws and chin. 



The length of the head is contained 5 times in total. Interorbital area flat, its width 

 (11 millimeters) equal to one-sixth length of head. Postorbital portion of head about 24 

 times diameter of eye. The operculum terminates in a Hat obtuse spine, its length, includ 

 ing the Hap, about equal to diameter of eye. I'l eopei culum entire, witli a prominent ridge 

 in advance of its posterior edge. The orbit is rounded, the least diameter of the eye equal 

 to the length of the snout, and contained 4 J, times in length of head (slightly less in the 

 larger specimen). 



Snout very broad, obtuse, the intermaxillaries extending beyond it, its width at the nos 

 toils euual to about twice the length of the eye. Posterior extremities of the intermaxil 

 buy processes elevated, producing a decided hump upon the top of the snout. The ridge 



