of the Fishery Board for Scotland. 



185 



The breadth of this specimen across the stomach was 3*56 mm., while a 

 breadth of 3*76 mm. was measured more posteriorly. The left eye had 

 now advanced further upwards, so that, when viewed laterally, the pupil 

 was seen on a level with the dorsal outline of the skull. The rays in the 

 dorsal and ventral marginal fins had become more prominent and were 

 developed to the edges of the fins, while the tail had again attained a 

 homocerc appearance — the urostyle being bent almost vertical dorsally. 

 The pigmentation on the marginal fins was now arranged in radial lines 

 from the edges, while black stellate spots formed a prominent line along 

 the root of the same fins posteriorly. This was particularly prominent on 

 the ventral side, where the line extended from the gut to the root of the 

 tail. Radiant lines of black pigment were also present on the caudal fin. 



ilst to ibth day. 



The following measurements are from a specimen forty-two days old 

 (second day of the present period, fig. 5) : — 



From tip of the snout to the clavicular bones, , . 3 '04 mm. 



From these bones to a vertical line from the posterior 



curve of the gut, 1'84 mm. 



From this line to the root of the tail, , , , 5 '92 mm. 



Length of the tail, , , 1*60 mm. 



Length of the larvre, ,.»,,, 12*40 mm. 



The greatest breadth was 4*80 mm. In this specimen the left eye had 

 reached the dorsal edge of the skull, and the pupil was directed horizontally 

 or slightly upwards. The dorsal fin had not yet reached the eye. A. few 

 teeth were present on the mandibular bone, and a projecting fold showed 

 the developing pelvic fins. This specimen had been resting flat on the 

 bottom for the last twenty-four hours, and its post-larval stage had there- 

 fore now come to an end. Only a little pigment was visible on the left 

 side, while on the right side it had become more systematically arranged. 

 Four spots or patches of black stellate pigment were seen on the body 

 near the root of the dorsal fin, and a fifth was developing in the same 

 line near the tail. Two similar pigment patches were present on the 

 middle of the body — the anterior just behind the stomach, and a posterior 

 half-way between the former and the root of the tail. 



On the 45th day an average specimen (fig. 9), which had been on the 

 bottom for three or four days, had the following dimensions : — 



From tip of the snout to the clavicular bones, . . .4*0 mm. 

 From these bones to a vertical line touching 



the posterior curve of the gut, . . . . .2*08 mm. 



From this line to the root of the tail, . . . .5*60 mm. 



The tail, . . 2 '08 mm. 



Length of larvre, 13*76 mm. 



Greatest breadth, 6 '40 mm. 



Beside this increase in size, the most noticeable difference from the last 

 specimen described was an increase in minute pigment spots, evenly spread 

 over the right side of the body and fins. The left eye had passed the 

 dorsal line, but had not yet reached its future position. The marginal 

 (dorsal) fin was now in a line with the left eye, which was somewhat 

 nearer the tip of the snout than the right. There was no noticeable 

 advance in development of the pelvic fins. 



