LARVAL AND POST-LARVAL TELEOSTEANS. 



;67 



farther advanced. The vertebrse number about 9+38=47. The lower 

 jaw still projects. The snout is decidedly more vertical and almost 

 continuous in outline with the dorsal fin margin, except for a small 

 indentation marking the origin of the dorsal fin. The dorsal fin 

 protuberance is almost parallel with the margin of the mid brain, the 

 anterior border of which is in advance of the orbit. The eyes are sym- 

 metrical. Interspines have developed. The first dorsal interspine lies 

 directly over the middle of the medullary region. The air bladder is now 

 well defined and is comparatively large — its length being almost equal to 

 that of the snout. The notochord is still straight. 



The pigment is much more pronounced, though similar in arrangement 





Fig. G.—Solea lascaris. Length ca. 6 ram. Oithona Station, XCVIIL A, 25th Aug., 



1913. Total depth 36 fms. Midwater haul. 

 Fio. 6a. — Chromatophores enlarged. 

 Del. E Ford. 



to that in the previous specimen. Chromatophores are developed on the 



snout and on the brain region, which latter is distinctly marked by a line 



of dark pigment, stretching from the fore brain, over the mid brain, hind 



brain and medulla, and ending with the beginning of the notochord. 



The notochordal line of pigment is less interrupted, and reaches almost 



to the caudal. This line of pigment marks out the ventral aspect of the 



spinal chord. An interrupted line of pigment runs along the base of the 



anal interspines, becoming more distinct in the region of the posterior 



bar of pigment. 



Fig. 7. Length 7'75 mm. 



The preanal length is 342 mm. The snout (measured from the tip of 

 the upper jaw to the anterior margin of the eye) is about equal to the 



