DISCUSSION OF SPKrTIvS AND TIU'.IR DISTIMIil^TION. 421 



more tlian half as long as tlic eye. The inmibcr of gill rakius on tliis arcli is 25, 20 being 

 below the angle. 



Pseuaobrancbia^ present, very rndinientary in some individuals, in others wanting or 

 present only npon one side. 



The first dorsal is distant from siiont C.S millimeters, wliieii is sjio-htly more lliati 

 length of the head; the length of its l)ase (21 millimeters) is about e(jual to width of the 

 snout at the nostrils. The lin eousists of 2 si)ines, the first of which is minute, and !t 

 branched rays. The length of the hmgest spine, which is armed, is contained twice in tliat 

 of the head (specimens examined imperfect). 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 seccmd 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 hnlf that of the head. 



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

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

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



Eadial formula: D. ii, 9, 125; A. 110; Y. 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 Jilale from station 

 Lxxx, off Martiui(]ue, at a depth of 472 fathoms. 



Collateral types were secured by the Allxtfroxs from station 2.392, in 28° 47' 30" N. lat., 

 870 27' W. lou., at a de])th of 724 fithoms; fiom station 2;?94, in 28° 38' 30" N. lat., 87 

 02' W. Ion., at a depth of 420 fathoms; and Cat. Nos. 34910, 34911, 34918, and 34920, IJ.' 

 S. N. M., from station 2117, in 15° 24' 40" N. hit., 03° 31' 40" W. Ion., at a depth of (i,S3 

 fathoms. The Bhikc also captured an individnal at station Lxxxii, in 23'^ 48' ]M. lat., Sti° 

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



nATIIYGADUS ARCUATTTS. f;r.(>i>E and Bean. 



Bathygnrhis arniiiiiis. Goodf, an<l Bkan, Hull. Miis. Cniii)). Zo<il., xii, No. 5, 158. 



The body is shaped much as in ('Judlnnrn sinnilti, 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 frons the interorl)ital 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; tho.se 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 tlie 

 origin of tlie 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 fi)rwards. 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 millimeter.s) equal to one-sixth lengtJi of head. Po.storbital jHation of Iiead about 2.+ 

 times diameter of eye. The opercuhim terminates in a (lat obtuse spine, its length, includ- 

 ing the flap, about e(inal to diameter of eye. l'r<'oi)ercuIum entire, with a prominent ridge 

 in advance of its po.sterior edge. Tlie oiiiit is i-oiindeiL the least diameter of the eye eiiiial 

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

 larger specimen). 



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

 trils equal to about twice the length of the eye. Posterior extremities of the intermaxil- 

 lary processes elevated, producing a decidi'd hump iii)oii the top of the snout. The ridge 



