21G PROCEEDINGS OF THE ACADEMY OP 



each scale ; while a large ocellus, very dark-blue, margined with light, adorns 

 the back and the dorsal fin between the last spine and the sixth ray; and a 

 small ocellus is on the back of the tail, behind the dorsal fin. Below the 

 lateral line and behind the dorsal ocellus, the color is brownish-yellow, 

 darker in front along the margins of the scales, and with an 

 indistinct bluish dot in the centre of each scale, except on the caudal 

 peduuele, where they are absent. The head above has two blue lines ; one on 

 each side, continued from the snout backwards on the nape ; another line is 

 continued from the upper angle of the orbit to the row of scales above the 

 lateral line. A bar crosses the preorbital, and a line interrupted passes along 

 the suborbital chain ; a bar is behind the ends of the maxillary. The scales 

 on the cheeks and opercula are dotted with blue. The dorsal fin, behind its 

 produced rays, as well as the anal, caudal, pectoral and ventral fins, are yel- 

 lowish ; the former faintly marked with blue on its scales, and margined in 

 front with dusky ; the ventrals are likewise margined on their outer edges 

 with dusky. 



Genus POMATAPRION Gill. 

 This genus is very closely related to Hypsypops and Pomacentrus, but is dis- 

 tinguished from the former by the much higher and more covered scales, ar- 

 rayed in about fourteen longitudinal rows ; the prolongation of the lobes of 

 the caudal fin, and the scaly snout. From Pomacentrus it differs in the entire 

 preoperculum in the extremely old as in the young, and the higher preorbital 

 region. From Euschistodm it is distinguished by the entire teeth ; from Gly- 

 phidodon by the entire teeth, elevated preorbital region, form of the head, &c. ; 

 and from Parma by the size of the scales. 



There are two Galifornian species of this genus, which may be distinguished 

 as follows : 



1. Lower limb of the preoperculum naked ; height of body con- 

 tained about 2times in the total length. Ucud above in youth, 

 with two blue lines, one on each side, decurrent over or be- 

 hind the eye, and two bine spots or lines on nape. Back of 

 tail behind dorsal with a dark spot bordered in front by 

 blue. 

 *. Body uniformly colored, with two whitish blue spots above 



lateral line below fourth and last dorsal spines P. dorsalis. 



p. Body below and tail yellowish, without distinct blue spots. 



Occiput with two parallel blue lines in youth P. Bairdii. 



POMATAPRION DORSALIS Gill. 



Hypsvpops dorsalis Gill, Proc. Academy of Natural Sciences of Phila.. 1862, 



" p.~147 (old). 

 Pomacentrus quadrigutta GUI, op. cit., 1862, p. 149 (young). Gill, in Giin- 

 ther's Catalogue of the Fishes in the British Museum, vol. iv. p. 27. 

 Gunther, Catalogue of the Fishes in the British Museum, vol. iv. p. 27. 

 Glyphidodon dorsalis Gunther, op. cit., vol. iv. p. 50. 



In the young, the color of the body is a purplish-brown, varied with blue 

 on the centre of each scale, the blue diminishing on the scales of the tail 

 towards the fin. On each side there is a blue spot on the first scale above 

 the lateral line, on the scale above the seventh of the lateral line and below 

 the fourth dorsal spine, and another on the one above the fifteenth scale and 

 below the eleventh or twelfth spine ; on the tail, behind the dorsal fin, there 

 is a transverse dark band, bordered in front by blue. The head above has 

 two blue lines, one on each side, running from, and decurved over, the eye 

 behind the orbit. The forehead is indistinctly marked with blue in the centre 

 of each scale ; and on the nape there are two oblong blue spots, one on each 

 side. A continuous blue line is continued from the side of the snout along 

 the suborbital chain, and unites with the line decurrent behind the orbit. 



[Sept. 



