Holt — On the Eggs and Larvm of Teleosteans. 455 



mences just behind tlie level of the otocyst; the caudal is short and narrow, and 

 almost lanceolate. Pigment is of two kinds, black and grass-green (chrome- 

 yellow by transmitted light). The yellow is generally distributed over the head 

 and the anterior and postero-ventral parts of the yolk-sac. From the otocystic 

 region, dorsal, renal, and ventral-intestinal lines of chromatophores run back 

 to the anal region. The post-anal region is crossed by three pigment bands 

 (p. b.), the most anterior of which is rather feebly marked. A few large chroma- 

 tophores occur on the anterior part of the dorsal fin. Black pigment is found in 

 stellate chromatophores on the top of the head and about the otocyst ; antero- 

 ventrally on the yolk-sac, and along the ventral edge of the gut. There are dorsal 

 and post-anal ventral rows of black as far back as the end of the second pigment 

 band, the former reappearing above the third and last band. 



Pleuronectes cynoglossus (Linn.). The Pole Dab, or White Sole. 



The ova of this species were fir.st obtained by Mr. J. T. Cimningham in the 

 Clyde, and are described by him in a Paper " On the Eggs and Larvae of Teleos- 

 teans" (Trans. E,. S. E., pt. i., vol. xxxiii., p. 101). He gives l"155mm. as the 

 diameter after the formation of the perivitelline space. 



The trawl brought up some ripe females in Donegal Bay on the 26th June. I 

 found that the diameter in the ripe unfertilized egg varied from 1'07 to l"13mm. 

 The yolk is clear and homogeneous, and the zona has an appearance of close 

 longitudinal striation. Li stained spirit preparations under a high power the 

 striation can be reduced to numerous short line-like markings, lying close side 

 by side, with overlapping ends. They appear to be due to the fact, shown in 

 optical section, that the internal surface of the zona is raised up into numerous 

 minute ridges. This condition, which is met with also in the unfertilized egg of 

 the brill, may perhaps disappear with the formation of the perivitelline space, or 

 may be due to the action of reagents ; the striation, however, is as well marked in 

 fresh as in preserved specimens. 



CLUPEIDiE. 



Clupea sprattus (Linn.). The Sprat. 



The ova of this species occurred in the surface net in Inver Bay on June 25th, 

 and in Clew Bay on the 30 th June. 



Number's of young sprats between 2 and 3 inches long occurred in the stomach 

 of Acanthias on the latter occasion. 



