On Holocentrum osculum, Poey. 259 



lip with a strong continuous fold. Sc. 28-29 % 1^-2 between 

 upper lateral line and base of soft dorsal. L. lat. 18-20 + 10. 

 D. XV 9-10. A. Vl-VII 7-8. Dorsal commencing- behind 

 axil of pectoral, the spines rather weak, the last 2£-2f times 

 in the length of head and not longer than the last of the 

 anal ; soft dorsal and anal pointed ; pectoral about f the 

 length of head ; ventral extending beyond origin of anal ; 

 caudal weakly emarginate; caudal peduncle as long as deep. 

 Brownish, with small light blue spots on the head and one 

 at the base of each scale on the body ; a dark blotch on the 

 lateral line below the 13th- 15th dorsal spines. 



Total length 100 mm. 



Two specimens from Santo Domingo de Guzman, Mexico, 

 collected by Dr. A. C. Buller. 



Her os aureus, Gthr., is distinguished by the deeper body 

 (depth 2£-2A in the total length), smaller scales (33^), and 

 longer dorsal spines (the last ^ the length of head) . 



XXXI. — Descriptions of Holocentrum osculum, Poey, and of 

 a new Fish of the Genus Centropomus. By O. Tate 

 Regan, B.A. 



Amongst the fishes collected by Dr. R. Bowdler Sharpe in 

 the West Indies are several examples of a Holocentrum which 

 I have no doubt is the little-known H. osculum of Poey, and 

 as such I describe it below. I also take the opportunity to 

 describe a new Centropomus from the West Indies. 



Holocentrum osculum. 



Holocentrum osculum, Poey, Memorias, ii. p. 156 (1860). 

 Holocentrum perlatum, Poey, t. c. p. 157. 



Depth of body 3-3§ times in the total length (without 

 caudal) and nearly equal to the length of head (opercular 

 spine included). Snout equal in length to the interorbital 

 width, |— | the diameter of eye, which is 3 times in the length 

 of head. Maxillary extending to below anterior edge of 

 pupil, the width of its distal extremity § the diameter of 

 eye. Opercular spine strong, with 1 or 2 more or less dis- 

 tinct much shorter spines below; praiopercular spine extending 

 back far beyond the subopercular margin; prseorbitalstrono-ly 

 serrated and with an anterior downwardly directed spine. 

 15-16 gill-rakers on the lower part of anterior arch. 



17* 



