DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 61 



Between the Literal line and the origin of fche dorsal aiciiA scales, the origin of the ventral 

 (J. The greatest length of the head to the end of the flexible flap of the operculum slightly 

 exceeds one fourth of the body length, and is itself slightly more than 4 times the Length of 

 the snout. The longitudinal diameter of the orbit is l times thai of the interorbital space 

 and enters 3 in length of head. The maxillary, broad and flattened posteriorly, is in length 

 one-tenth of the body, and extends back to perpendicular from the anterior margin of the 

 pupil. The articulation of the mandible is in advance of the posterior tip of the maxillary, 

 its length slightly greater, and it protrudes beyond the snout, when the mouth is open, a 

 distauee greater than the width of the interorbital area. When the mouth is closed its tip 

 still projects noticeably. 



The dorsal tin is located almost midway between the snout and the adipose dorsal. Its 

 height is almost equal to that of the ventral. The adipose dorsal is over the middle of the 

 anal, its length half the diameter of the orbit. 



The distance of the anal from the snout is about three-fourths of the body length. Its 

 length of base is equal to the length of the snout; its height to that of the middle caudal 

 lays. The caudal is furcate. The pectoral is long, subfalcate, inserted close to the bran- 

 chial (deft, its tip extending to the fourteenth or fifteenth scale of the lateral line, its length 

 twice that of the mandible. 



The ventral is located two-fifths of the way from the snout to the base of the caudal, 

 and directly under the middle of the dorsal. 



Radial formula: D. 11 + 1; A. S; (J. 10; P. 17 or 18; V. 9 or 10; L. hit. about 48. 



Color grayish mottled with brown, scales metallic, silvery. 



Specimens were obtained by the Fish Hit irk in five localities ranging in depth from 101 

 to 156 fathoms, and by the Albatross from eleven stations at depths of from 85 to 167 

 fathoms. 



fl. chalybeius is not identical with C. Agassi~ii, but is well separated by the smaller eye, 

 longer, more conical snout, lower, more terete body, and larger scales. It closely resembles 

 it, however, in general form. Dr. Giinther's diagnosis of ('. Agassizii in the Challenger 

 volume more nearly applies to C. chalybeius, and his figure is apparently of C. ohalybeius. 



C. product m, Giinther, was obtained off the Fiji Islands, at a depth of 315 fathoms. 



('. nigripinnis, Giinther, is known only from a single individual, taken bythe Challenger 

 off Twofold Bay, at a depth of 120 fathoms. 



CHLOROPHTHALMUS TRUCULENTUS, Goode and Beax, n. s. (Figure 72.) 



Body subterete, somewhat compressed, its height 5A in its length, its width about 8. 

 The least height of the tail is contained about 2$ in the greatest height of the body at the 

 insertion of the dorsal. Scales moderate, cycloid, arranged in regular transverse rows, 

 overlapping in such manner as to resemble oblique plates on the sides. The lateral line is 

 rather inconspicuous, containing between 40 and 50 scales (on account of denuded condition 

 of body, an accurate enumeration can not be made). There are about 6 scales between 

 the lateral line and the origin of the dorsal, and 6 or 7 between it and the ventral. The 

 greatest length of the head from the tip of the projecting lower jaw is a little more than 

 one-third of the length of the body, and is contained 1'A times in the length of the snout. 

 The lower jaw projects beyond the tip of the snout a distance equal to one-fourth the length 

 of the snout. The diameter of the orbit is nearly equal to that of the snout, and about one- 

 third the length of the head. The width of the interorbital space is contained twice in the 

 longitudinal diameter of the orbit. The maxillary is broad and flattened posteriorly, is con 

 tained about 8 times in the length of the body, and does not reach to the perpendicular bom 

 the anterior margin of the orbit. The insertion of the dorsal is midway between the tip of the 

 snout and the adipose dorsal. Its height is greater than the length of the ventral, which is 

 equal to the greatest height of the body. The adipose dorsal is over the middle of the baseof 

 the anal, its length two-fifths of the diameter of the orbit. 



The distance of the anal from the snout is about three-fourths of the body's length; the 



