3. TIUCHHTKUS. 347 



bones to that we have observed in several of the neural and inter- 

 neural spines of LepidopvbS caudatus. The structure of the skull is 

 extremely similar to that in Aplianopus and Lepidopxis, but differs 

 from the latter in the following points : — 



The two ridges on the interorbital space, which converge poste- 

 riorly and form an acute prominence in the middle of the crown of 

 the head, begin above the anterior part of the orbit, and meet at 

 an angle of about 30°. 



The palatines are provided with a narrow band of villiform teeth. 

 The intermaxillai-y bones are armed with two pairs of strong fangs, the 

 anterior of which is situated at the foremost extremity of the bones ; 

 the lateral series are formed by about fifteen teeth in each of the jaws. 



The praeorbital is membranaceous, striated, covering nearly the 

 whole space between the orbit and the jaw-bones. The operculum 

 and suboperculum have the posterior margin provided vdth long 

 flexible fringes. 



The abdominal portion of the vertebral column is formed by thirty- 

 nine, the caudal by about one hundred and twenty vertebrae*. The 

 posterior vertebra3 can scarcely be distinguished from one another. 

 The ribs are excessively frail, filiform ; the haemal and neural spines 

 are slender, and an interhsemal and interneural correspond to every 

 one of them. 



2. Tricliiurus savala. 



Trichiurus savala, Cuv. Recinc Anim. ; Cuv. Sf Val. viii. p. 251. pi. 224; 



Cant. Ann. SfMag. Nat. Hist. ix. p. 15, and Catal. p. 115 ; Cuv. Rl'cjnc. 



Anim. Ml. Poiss. pi. 68 ; Blcek. Makr. Verh. Bat. Gen. xxiv. p. 41 

 armatus, Gray, Zool. Misc. p. 9, and ///. Incl. Zuol. pi. f. 1 ; 



Richards. Ichth. CJiina, p. 268. 



D. 112-130. 



The height of the body is 13 to 16 times in the total length, the 

 length of the head 6^ to 1\ ; the diameter of the eye is 3| in the 

 length of the snout, and equals the width of the interorbital space, 

 which is quite flat. 



East Indian Seas. 



a. Adult. India. Presented by General Hardwicke. — Type of 

 Trichiurus (unnatus. 

 Adult. China. 



c. Adult: skin. Malayan Peninsula. From Dr. Cantor's Collection. 



d. Half-grown : skin. Malayan Peninsula. From Dr. Cantor's 



Collection. 



3. Tricliiurus japonicus. 



Trichiurus lepturus japonicus, Faun. Japon. Poiss. p. 102. pi. 54. 

 japonicus, Bleek. Verhand. Batav. Genootsch. xxvi. Japan, p. 98. 



D. 139. 



The height of the body is 10 times in the total length, the length 



* Cuvicr states sixf v Tertcbra; for the abdominal portion, and one hundred for 

 (lie caudal. 



