226 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



shaped s^roove is exposed bet'u-een the orbits. The lengtli of the iDterniaxilla (S millime- 

 ters) is oue half that of the head without the snout. The maxilla is thin, broad, obtuse at 

 the extremity; its length (9 millimeters) equal to that of the interorbital area. The length 

 of the mandible (10 millimeters) is nearly one-half that of the head. The month is almost 

 vertical when elosed. The quadrate bone ends posteriorly in a broad, obtuse spine; it has 

 several ridges with minute ciiri. The supraorbital, also, has several minutely cirrated 

 ridges. 



Teeth in the jaws so minute as to be indistinguishable except to the touch. The nostrils 

 are placed close to the front of the eye and somewhat above its middle; the posterior is 

 much the larger; it is a spear-shaped slit about three times as long as the anterior. 



I'seudobranchiie well developed; 14 or 15 very small lanceolate gill rakers below the 

 angle on the iirst arch. The gill oi)cnings are very wide, the membranes very deeply cleft 

 and only narrowly attached to the isthmus in trout. Branchiostegals 8. 



The dorsal and ventral origins are in the same vertical. 



The distance of the sj)inous dorsal from the snout is equal to the greatest height of the 

 body. The spinous dorsal contains 6 or 7 sjjines, the first of which is minute, about one- 

 fourth as long as the second, which is as long as the eye. The second spine is finely ser- 

 rated in the nuddle of its anterior margin and is dilated at the root so as to partly conceal 

 the base of the third spine. 



The rays of the soft dorsal increase in size backwards, the first being only one-third as 

 long as the last, which is about one-fourth as long as the head. The longest rays of the 

 soft dorsal are about the nineteenth to the twenty -fourth ; these are slightly longer than the 

 last. The caudal is almost truncate or very slightly roimded when expanded. Its middle 

 rays are nearly as long as the eye. 



The vent is under the fifth ray of the second dorsal, and the anal origin under the sixth 

 ray. The anal rays, also, increase in size backwards but the longest are nut more than 

 three-fourths as long as those of the dorsal. The rays of the soft dorsal and anal are all 

 simple and articulated. The length of the ventral spine is one-fourth of the standard 

 length; it exceeds that of the longest ventral ray. The ventral when fully expanded is sub- 

 triangular; the spine is minutely serrated on its anterior margin. The pectoral is sub cir- 

 cular when expanded and is composed entirely of simple articulated rays, the longest, in 

 the middle of the fin, (me-half as long as the eye. There are about 10 rows of scales between 

 the lateral line and the base of the spinous dorsal, and about 07 in the lateral line. 



Radial formula: D. Vi-Vli, 20; A. 23; V. i, 0; P. 10. 



The types of the description are a single individual, No. 39200, taken by the Albatross 

 at station 2358, N. lat. 20o 19', W. Ion. 87° 03' 30", in 220 fathoms, off Yucatan, and two 

 specimens, No. 39297, from Albatross, station 2055, N. lat. 27° 22', W. Ion. 78° 07' 30", 338 

 fathoms. Little Bahama Bank. 



The species is a true Cyttus, resembling the southern species, but with a single preanal 

 spine, fewer rays in the vertical fins, and with the body entirely scaled. The plates at the 

 dorsal and anal bases are well developed. 



No. 39290 is 75 millimeters long, and the larger specimen of No. 39297 is 80 millimeters 

 long, while the length of the smaller is 80 millimeters. 



CYTTOPSIS, Gill. 



Cyttopsis, Gill, Proc. Acacl. Nat. Sci. Phil.a., 1862, 126 (type, Zeus rosem, LoWE). 



A genus of Zeidw without bony plates at the bases of the vertical fins, but with a series 

 of shields on the ventral line between the ventral and the anal fins. Body nuich com]iressed, 

 elevated, partially naked. Teeth minute iu bands, in the jaws, and on the vomer. Bran- 

 chiostegals 7. Ventrals i, 7. 



