314 GTMNODONTES. 



8. Chilomycterus tigrinus. 



Chilomycterus reticulatus, ij'j'ir. Rev. Zool. 184C, p. 14i! (no descript.; 



noti.). 

 Diodon tigrinus, Cuv. MSm. Mus. 1818, p. 127. 

 Cyaniclithys cseruleus, Kaup, I. c. p. 231 (not Q. 8^- G.). 



Spines short, slightly compressed, with the roots of moderate 

 length. Forehead concave, without spine. Three supraorbital 

 spines, the anterior of which is rather strong, emitting its inner root 

 across the frontal bone. Nostrils in front of the orbit. Two osseous 

 stripes across the back of the tail, behind the dorsal fin, the poste- 

 rior with the spine in the median line ; abdominal ossifications as 

 much developed as those on the back ; there are eight in a longitu- 

 dinal series nearest to the median line of the back. All the upper 

 parts with small round blackish spots. A few small black spots on 

 the side of the abdomen. Fins colourless. D. 13. A. 13. C. 10. 

 P. 21. 



? Indian Ocean. 



a. Two inches long. Open sea. Presented by J. B. Godfrey, ESq. 



b. Two and a half inches long : type of Ci/anichthys cceruleus (Kaup). 



The nostrils of this species do not difier from those of its congeners. 

 Dr. Kaup states that the specimen examined by him is from New 

 Guinea ; but the source whence the example was obtained was never 

 known at the British Museum. He has evidently transferred Gai- 

 mard's statement, which refers to another species, to this individual. 



9. Chilomycterus aflfinis. 



Spines very short, compressed, with long, strong, flat, ridged roots, 

 the anterior root being the longest. The flat interorbital space and 

 the forehead without spines or ossifications. Supraorbital spines 

 very feeble ; the inner root of the foremost does not overlap the frontal 

 hone. Back of the tail crossed by two osseous stripes, the anterior 

 composed of two roots of two ossifications, and the posterior being a 

 single two-rooted ossification with a spine ; abdominal ossifications as 

 much developed as those on the back ; there are eight in a longitu- 

 dinal series nearest to the median line of the back. The dark colo- 

 ration of the back descends on the sides in front of and behind the 

 pectoral fin and in front of the dorsal. Two or three round black 

 spots behind the pectoral fin ; a black vertical bar below the eye. 

 No other spots on the body ; fin-rays with numerous brown dots, 

 P. 21. D. 13. A. 12. C. 10. 



Hab. ? 



a. Stuffed, 15 inches long. 



6. DICOTYLICHTHYS. 



Dicotylichthys, Kaup. 

 Jaws without median suture. Body covered with dermal ossifi- 



