St. Andrews Marine Laboratory. 59 



longer than in the sketch, and has embryonic fin-rays. The 

 head has large silvery eyes, with greenish-yellow pigment 

 behind them, and around and below the widely open mouth. 

 The trunk generally is dotted over with the same greenish- 

 yellow pigment (ochreous by transmitted light), which is also 

 present in streaks on the basal region of the pectoral fins, on 

 the yolk-sac, and on the prominent anal cone. The three 

 yellow dorsal patches in the marginal fin are distinctly 

 separated and generally have the distal border opaque white, 

 the first being small and nearly in a line running upward 

 from the posterior border of the vent, the second about the 

 widest part of the fin, and the third about the posterior region 

 of the same dilatation. Opposite the two latter is a corre- 

 sponding patch ventrally. A similar touch of yellow occurs 

 at the commencement of the tail. Numerous stellate black 

 pigment-spots are present on the yolk-sac, a few on the 

 pectoral, and a series along the dorsal and ventral margins of 

 the body as far as the third patch of yellow on the marginal 

 fin. One or two occur on the border of the marginal fin and 

 a considerable number in the ventral patch of yellow (second) 

 in the latter, while only a very iQ\Y are found in the dorsal 

 patch opposite it. Two exist in the ventral touch behind the 

 former and only traces in the dorsal patch opposite. One or 

 two chromatophores also occur ventrally in the patch at the 

 root of the tail. The black pigment would seem to be better 

 developed ventrally than dorsally. 



In connexion with the appearance of eggs at this period it 

 may be mentioned that on the 10th October a larval form 

 resembling Cottus was captured in the tow-net. In general 

 outline it resembled that figured in the "Researches"* (some- 

 what younger than in fig. 9, pi. xvi.), with the vessels 

 coursing over the yolk-sac. Tlie oil-globule remained at the 

 anterior part of the yolk-sac. Small specks of black pigment 

 occurred along the sides of the body, one set forming a row 

 near the upper lateral region. No distinct coloration was 

 visible on the pectorals. The eyes were iridescent greenish, 

 like the inner surface of llaliotis. 



Hitherto it has been unusual to get larvte at this season of 

 the year, so that the deposition of such eggs must have, been 

 antedated by some months on this occasion if the interpreta- 

 tion of the nature of the larvae be correct. 



* Op. cit. 



