4G2 CLiJPEiD.li:. 



2. Mn,viUanj prolonffcd backwards in adult examples. 

 a. Dorsal Jin present : Odontognathus. 



5. Pristigaster mucronatus. 



Odontognathus mucronatus, Lacep. ii. p. 221, pi. 7. fig. 2. 



Gnathobolus, Bl. Schi. p. 556. 



Gnathobolus mucronatus, t'uv. <§• Val. xxi. p. 91, pi. 611. 



D. 11-12. A. 74-78-82. 



Scales ? The height of the body is contained four times and two- 

 thirds in the total length (without caudal), the length of the head 

 five times. The diameter of the eye equals the extent of the snout, 

 and is two-sevenths of the length of the head. Maxillary tapering 

 and extending downwards to the edge of the interoperculum in an. 

 example four inches long, obliquely truncated and conspicuously 

 shorter in another of three inches. Origin of the dorsal fin twice as 

 distant from the eye as from the root of the caudal. There are 

 eight spines along the thoracic region, and eleven along the abdo- 

 minal. 



Guyanas. 



a-h. We have only two examples of this singular species, 4 and 3 

 inches long ; they are evidently young and perfectly diaphanous. 

 They illustrate well the development of the upper jaw with age, 

 which may be also observed in JRaconda riisseUiana, to which 

 they are most closely allied. 



/ b. Dorsal Jin none : Eaconda. 



6. Pristigaster russellianus. 



Raconda russelliana, Gray, Zool. Misc. p. 9 ; Cant. Mai. Fish. p. 292, 

 Apterygia ramcarate. Gray, Ind. Zool. c. fig. (not good). 

 haniiltonii, Cuv. Sf Val. xx. p. 3-33. 



A. 83-86. L. lat. GO. 



The height of the body is contained thrice and four-fifths in 

 the total length (without caudal), the length of the head five times 

 and three -fourths. The diameter of the eye is more than the length 

 of the snout, and contained thrice and one-third in that of the head. 

 Maxillary tapering and produced in adult examples, in which it ex- 

 tends backwards to the gill-opening, much shorter in immature spe- 

 cimens, in which it reaches only to the mandibulary joint. There 

 are about thirty-one feeble spines along the lower profile. 



Bay of Bengal ; Malayan peninsula. 



a-b. Adult (8 inches) and halt-grown. Bengal. Presented by G. 



B. Waterhouse, Esq. 

 c-d. Young, types of the species. 

 e. Adult, type of Aiderygia ramcarate. Presented by General 



Hardwicke. 

 /. Adult : skin. Pinang. From Dr. Cantor's Collection. 

 </. Adult : skin. From the Collection of the Zoological Society. 



