46 A. E. IIEFFORD. 



tents are clear and almost colourless. The head is rounded ; the anus 

 post-median. The dorsal fin membrane arises above the mid-brain and 

 is widest above the anus. There is a well-marked pre-anal fin. The 

 whole of the larval fin membrane has a minute vesicular structure, 

 which is probably a mark of ill-health. Embryonic rays can be seen 

 in the caudal region. The notochord has two layers of cells at least 

 in its posterior part. The pectoral fins are well developed. The body 

 is richly pigmented with black and yellow chromatophores, but the 

 posterior third is conspicuously bare, except for a line of black chro- 

 matophores along the ventral contour, while black pigment is lacking 

 above the mid-brain. The sides of the body from the occipital region 

 to a short distance beyond the anus are almost uniformly coloured 

 with round, stellate, black chromatophores about four or five deep. 

 These are most closely set along the dorsal contour, and are more 

 densely distributed above and posterior to the anus than above the 

 yolk-sac. They are not uniformly distributed in the body segments as 

 described by Matthews for L. maculatus, but except for the posterior 

 continuation of the ventral line, as above-mentioned, and for the 

 presence of black chromatophores over the sides of the gut, the distri- 

 liution and abundance of black pigment on the body show much agree- 

 ment with his specimen. The largest black chromatophores of all are 

 to be seen on the yolk-sac. A group of about five to eight large, but 

 not very intense, chromatophores occurs in the anal fin, immediately 

 behind the anus ; otherwise, except for outgrowths from pigment cells 

 along the posterior ventral body margin, the larval fin membranes are 

 entirely free from black pigment (see Figs. 8 and 8a). Yellow pigment 

 is regularly interspersed with black along the sides of the trunk, but 

 is absent over the sides of the gut. There are a few yellow chromato- 

 phores on the head, and a single isolated one near the margin of the 

 anal fin, about half-way between the anus and the posterior end of the 

 notochord. Another specimen which I examined showed a less uniform 

 distribution of black pigment on the side of the trunk in the pre-anal 

 region, the chromatophores tending to concentrate along the dorsal 

 contour and above the gut. On the second day the larva had a length of 

 3*48 mm., the increase being practically entirely post-anal. At this 

 point I made detailed measurements, so as to compare with Matthews' 

 dimensions for L. maculatus, which I give side by side below : — 



