28. TKACHYPOMA. 167 



26. Plectropoma chlorurum. 

 Qtv. iSf Val ii. p. 406 * 



D. {|. A.}. Caec. pylor. 4. 



Prseoperculum finely serrated behind, with three rather stronger 

 denticulations at the angle, and with six at the horizontal limb. 

 Uniform blackish brown ; caudal and pectoral fins yellow, the other 

 ones black. 



Martinique. 



27. Plectropoma unicolor. 



Seha, iii. 27. 10. 



Holocentius unicolor, Bl. Schn. p. 322. 



Plectropoma ephippium, Cuv. 8; Val. ii. p. 408. 



D. ^. A.i-. 



15 7 



Muzzle pointed ; praeoperculum finely serrated behind, and with 

 rather stronger denticulations below. CaiidaHs emarginate. Brown- 

 ish : a black cross-band on the tail, a black spot in front of the eye, 

 a narrow violet undulated line from the eye to the angle of the prae- 

 operculum ; each scale on the breast with a small whitish speck in 

 the centre. 



East Indies ? 



a. Adult : stuffed. Sine patria. — Of uniform brown colour. 



28. TRACHYPOMAf. 



Seven branchiostegals. Teeth in villiform bands ; without canine 

 teeth ; teeth on the palatine bones ; tongue smooth. One dorsal, 

 with twelve spines ; the anal with three. Operculum with moderate 

 points ; praeoperculum with spinous teeth at the tower limb, directed 

 forward. Scales small. The number of p^doric appendages in- 

 creased (13). 



Pacific. 



1. Trachypoma macracanthus. (Plate XIII. fig. B.) 



D.{?. A.-|. L. lat. 65. C£^. pylor. 13. 



Similar to Plectropoma cyanostigma. The height of the body is 3| 

 in the total length ; the length of the head is one-third of the same. 

 Posterior limb of praeoperculum strongly denticulated ; the inferior 

 with three strong spinous teeth, the anterior of which is the largest ; 

 sub- and interoperculum entire. CaudaKs rounded. Brownish (in 

 spirits), covered aU over with very small whitish, darker-edged specks. 



a, 6. Norfolk Islands. From the Haslar Collection. 

 c, d. Norfolk Islands. From the Haslar Collection. 



* Plectropoma nigricans (Pocy, Memor. Cuba, 1851, p. 71) and Plectropoma 

 accensum (Poey, I. c. p. 72), both from Cuba, if not the same, are closely allied, 

 t From rpaxi's, spinous, and iriZfia. opercle. 



