110 



Vent situated between the ventral fins. About twelve long filiform pyloric 

 caeca. 



Disctinctive colours : first dorsal fin black with white root and tip. 



Bay of Bengal 193, 240, 270, and 320 to 296 fathoms : Andaman Sea, 265, 

 271, 405, 490 fathoms. 



Eegd. Nos. 11654, 11655, 11658, 11676, 11679, 11766, 11772, 12447, 18177, 



47 48 120 123 145 148 152 158 



T' T' T' T' T' T' T' T' 



86. Macrurus (3Iacrurus) Petersonii, Alcock. 



Macrurus petersonii, Aloock, Ann. Mag. Nat. Hist., Ang. 1891, p. 121: Journ. As. Soo. Bengal, Vol. LXIII. pt. 

 2, 1894, p. 127: Illustrations of the Zoology of the Intestigator, Fishes, pl. III. fig. 5. 



? Macrurus [Chalinurus) hispidus, Alcock, Ann. Mag. Nat. Hist., Nov. 1889, p. 397: lUuatrations of the 

 Zoology of the Investigator, Fishes pl. xiii. fig. 2 (is j^rolahly the young of M. Petersonii). 



B. 7. D. r + 10. A. mVc. 100. P. 18-20. V. 8. 

 Differs from M. investigatoris only in the following particulars : — 



The snout is quite as long as the eye, and its tubercles are not very much 

 pronounced. 



The eye is about a fourth the length of the head, and very little more than 

 the width of the interorbital space. 



The mouth is large, and the upper jaw, which is much longer than the 

 snout, reaches behind the middle of the eye. The outer row of teeth in the 

 ujjper jaw are enlarged. 



The barbel is at least as long as the eye. 



The scales are covered, but not very densely, with sharp conical spinelets, 

 not in rows, some of which project beyond the edge of the scale. Some scales 

 along the edge of the gill-opening, and in a patch immediately behind the first 

 dorsal fin, are quite smooth. 



Six rows of scales between the last ray of the first dorsal fin and the lateral 

 line. 



Second dorsal spine as long as the head behind the middle of the eye. 



Length of pectorals about equal to the postorbital portion of the head. 



Outer ventral ray hardly prolonged, its length not much more than two- 

 fifths that of the head. 



Over twenty longish vermiform pyloric caeca of great delicacy. 



Distinctive colouration : head and iris silvery ; first dorsal black with white 

 base and tip. 



Length of adult, 9j inches. 



Andaman Sea, 185 and 188 to 220 fathoms. 



