LARVAL AND POST-LARVAL TELEOSTEANS. 355 



Orange-red pigment, over which occur splashes of bright red, is 

 present on the anterior dorsal half of the abdominal region, while 

 yellow pigment occurs on the rest of the body and very faintly 

 in small patches on the head. A dense aggregate of dark pigment 

 marks off the posterior margin of the abdominal region, beginning 

 just above the longitudinal axis and extending as a line of dark 

 chromatophores to the origin of the anal fin. Large brownish- 

 black stellate chromatophores are spread over the dorsal half of the 

 head and body, leaving a clear space in front of the base of the 

 caudal fin. These large chromatophores are continued across the body 

 post-anally, along the lower part of the abdomen and the ventral margin 

 to the tip of the snout. A few black dots are scattered over the red 

 pigment of the abdominal region. The orbital region, especially the sub- 

 orbital, is practically devoid of pigment. No pigment is visible on the 

 second dorsal, caudal, and anal fins, while a few dark chromatophores 

 appear on the first dorsal and ventral fins. 



Fig. 4. Length 6 mm. 



The maximum height is contained a little more than twice in the total 

 length : length to caudal fin about 1^ times. The snout is slightly con- 

 cave above and below as in the adult ; its length is about equal to the 

 diameter of the eye. The marginal row of spines in front of the first 

 dorsal fin is very 'prominent. Similar rows are present on the prse- 

 maxillary region and along the spiny ray of the ventral fin. The second 

 dorsal and anal fins are separated from the caudal. Their rays are not 

 fully developed posteriorly. The spines of the first dorsal fin are strong 

 and well developed ; nine can be counted. The tip of the notochord is 

 turned upwards and the caudal rays well advanced. The dorsal mem- 

 brane of the caudal is still fairly large. 



The general arrangement and colour of the pigment is much the same 

 as in the previous specimen, though the reddish patch has extended 

 forward on to the orbital region. The colour is generally redder, owing 

 to the presence of a larger number of bright red splashes. 



PLEUKONECTID.E. 

 Pleuronectes limanda L. (common dab). P. flesus L. (flounder). 



P. 7nicrocej)halus Donov. (merry-sole). 



Records of post-larval P. flatessa are absent from the tables, though 



the eggs were observed fairly frequently during December, 1913, and 



January and February, 1914, They appeared in the tow-nets in the 



latter part of December, 1913, and continued to be observed during 



XEW SERIES. — VOL. X. NO. 2. JUNE, 1914. Z 



