MUSEUM OF COMPAEATIVE ZOOLOGY. 157 



Cithariclithys dinoceros, n. sp. 



The type is a specimen 92 mm. long to base of caudal, obtained by the 

 steamer "Blake " at Station xxi., off Guadaloupe, 175 fathoms. 



The greatest height of the body (40 mm.) is contained 2.3 times in the total 

 length, and equals about four times the least height of the tail. 



Scales thin, deciduous, cycloid, large, 48 in the lateral line, which is slightly 

 curved over the pectoral; 14 above and 16 below the lateral line. 



The length of the head (27 mm.) is contained 3^ times in the total length, 

 and equals about 3 J times the diameter of the eye (8 mm.). The interorbital 

 space is very narrow, its \^dth less than \ diameter of eye ; ridge rather 

 prominent, narrow, sharp. 



The upper eye distant from profile by a space (2 mm.) about J of the orbital 

 diameter. 



The length of the maxillary (12 mm.) is le^sthan half the length of the head ; 

 that of the mandible (16 mm.) more than half, and twice the diameter of the eye. 



The teeth uniserial in both jaws, those in the front much the largest. A 

 strong spine upon the snout overhanging the upper lip (much lower than in 

 C. unicornis). Above this there is a second, shorter spine. 



The dorsal fin begins upon the snout in advance of eye upon blind side. It 

 is composed of 91 rays, the longest somewhat behind the middle of the fin 

 (its height 13 mm.), about equal to half the length of the head. 



The anal fin originates about under the origin of the pectoral ; its distance 

 from the snout (30 mm.) equals J of the total length. It is composed of 73 

 rays, and is as high as the dorsal. 



Caudal subsessile, pointed, its length (17 mm.) contained about 5j times in 

 total length, and equalling twice the diameter of the orbit. 



The pectorals originate immediately behind the branchial opening, far below 

 the lateral line. The third and fourth rays of the fin upon the eyed side elon- 

 gated. Its length (38 mm.) is contained 2-^ times in total length. This fin has 

 10 rays ; that of the blind side contains 6 rays ; its length (12 mm.) is less 

 than J that of its mate, and is less than half the length of the head. 



The ventral on the eyed side originates upon the ventral ridge at a distance 

 from the snout (27 mm.) equal to the length of the head; it contains 5 rays, 

 the length of the first (6^ mm.) contained four times in length of the head. 

 The ventral of the blind side has 6 rays ; its length is contained 2§ times in 

 length of the head. 



Radial formula : D. 91 ; A. 73 ; P. 10/6 ; V. 5. L. lat. 48, 14/16. 



Color, grayish brown above, white below. 



XXL Off Martinique. xix. Off Barbadoea. 



XXVI. Off St. Lucie. xxix. " " 



XXVIII. Off Barbadoes. 



