I 



46. MVLETES. 373 



* The posterior series of iuterinaxillaiy teeth separated from 

 the anterior by an interspace. 



1. Myletes asterias. 



Mull. 8c Trosch. Hor. Iclith. i. p. .36. taf. 10. fig. 2 ; Cuv. Sf Val. xxii. 

 p. 217. 



D. 29-31. A. 39-40. V. 8. 



The height of the body is contained once and two-thirds in the 

 total length (without caudal), the length of the head thrice and four- 

 fifths. Abdominal serrature composed of from thirty-six to thirty- 

 eight simple spinous plates. Anterior dorsal rays not prolonged ; 

 the third anal ray very long and strong, cartilaginous, the other rays 

 gradually decreasing in length. Adipose fin short. Gill-rakers of 

 the outer branchial arch lanceolate, but rather short. Body with 

 more or less distinct round orange-coloured spots. 



Guiana. 



a-h. Two of the typical specimens. British Guiana. Presented Ijy 



Sir R. Schomburgk. 

 c~d. Fine specimens. Essequibo. From Mr. Ehrhardt's Collection. 



2. Myletes rubripimus. 

 Mull. 8f Trosch. Hor. Ichth. i. p. 38. taf. 9. fig. 3. 

 D. 26-27. A. 38-42. V. 7-8. 



The height of the body is contained once and two-fifths in the 

 total length (without caudal), the length of the head thi-ice and two- 

 thirds. Abdominal serrature comj^osed of li'om thii'ty-three to thirty- 

 six simple spinous plates. Anterior dorsal rays not prolonged ; the 

 third anal ray long and strong, cartilaginous, the other rays gra- 

 dually decreasing in length. Adipose fin short. Gill-rakers of the 

 outer branchial arch lanceolate, but rather short. Coloration uni- 

 form ; anal fin red anteriorly, with a broad black margin. 



Essequibo. 



a. One of the ty|)ical specimens. Presented by Sir 11. Schomburgk. 

 h-c. Fine specimens. From Mr. Ehrhardt's Collection. 



This species is very distinct from M. asterias, and may be rcadUy 

 recognized by the number of dorsal rays and by its more elevated 

 body. 



3. Myletes rhomboidalis. 



Myletes rhomboidalis, Cur. Mrm. Mvs. iv. p. 449. pi. 22. fig. 3 ; Cuv. 



^- Val. xxii. p. 210. 

 Tetragonopterus latus, Scliomb. Finli. Guian. i. p. 241. 

 .Myletes latus, MiiU. Sf Trosch. Ilor. Ichth. i. p. 37. 



D. 23. A. 33-36. V. 9. L. lat. 105. 



The height of the body is two-thirds of the total length (Avithout 

 caudal), the length of the head two-sevenths. Abdominal serrature 

 composed of from thirty-two to thirtj--six spinous plates. The length 

 of the adipose fin is equal to, or nearly equal to, its distance from the 



