20 A. E. HEFFORD, 



were 1*34, 1'36, and 1"30 mm. The first had between forty and fifty 

 oil-globules, varying from 0"015 to as large as 012 mm. ; the second 

 possessed about fifty and possibly more oil-globules of diameter from 

 0'015 to as large as 0*12 mm.; the third had only thirty-four oil- 

 globules of diameter 0"024-0*12 mm. At the commencement of the 

 development of the caudal rudiment black and yellow pigment occurs, 

 the former colour in rows of small chromatophores displaying stellate 

 forms. The larva, measured during the first day after the hatching, has 

 a total length of 2'88 mm., the distance from snout to anus being 

 1'38 mm. The yolk-sac is very globular in shape. Yellow is the 

 prevailing pigment, occurring in large, stellate chromatophores over 

 the body, embryonic fins, and yolk-sac. Large, stellate, black chromato- 

 phores are also to be seen over the yolk-sac, but they are not very 

 intense, and they are less numerous than the yellow. Black, stellate 

 pigment spots are also distributed along the body, chiefly on the 

 dorsal region, but at the posterior extremity is a short series of three 

 along the ventral contour. The most conspicuous black pigment is in 

 a series of twenty -five large, irregular, stellate or dendritic chromato- 

 phores along the margin of the dorsal fin membrane, extending from 

 the occipital region to about 0*4 mm. from the caudal extremity. 

 There is a similar series along the margin of the anal fin membrane, 

 but consisting of only six chromatophores. This specimen is practically 

 identical with the somewhat older specimen figured by Cunningham 

 in " A Treatise on the Common Sole," PI. XVII, Fig. 2. 



Subsequent specimens of this egg were taken on 29th June 1 mile 

 S.E. by E. of the Eddystone (1 egg of 1'29 mm. diameter), and on 

 26th August in about the same area (3 eggs, 2 of which measured 

 1-26 and 13 mm, in diameter), in each case in the catch of the young- 

 fish trawl. One or two post-larval stages were obtained in July and 

 August from the deeper layers of water between Plymouth Sound and 

 the Eddystone region. 



Solea lascaris, Bonaparte, Sand Sole. 



Holt (11a) (Species I), p. 457, PI. XLIX, Fig. 26 ; Pi. L, Figs. 34, 35. 

 (llf) (? Solea lascaris), p. 84, PI. V, Figs. 50, 51, 



On 14th March, 1910, a single egg with the segmented yolk cortex 

 typical of Solea and containing many oil-globules was taken in the tow- 

 net between Plymouth Sound and the Eddystone. Examined on the 

 15th March, its diameter was about 1-36 mm., and the oil-globules, 

 which numbered more than fifty, showed a characteristic arrangement. 

 They were not aggregated closely together in opaque clusters as in 



