of the Fishery Board for Scotland. 
317 
VII.—FURTHER OBSERVATIONS ON THE LIFE-HISTORIES 
AND DEVELOPMENT OF THE FOOD AND OTHER FISHES. 
By Professor M'Intosh, M.D., LL.D., F.R.S., St Andrews Marine 
Laboratory. (Plates X.-XIIL) 
CONTENTS. 
1. 
2. 
On the Development of the Brill (hybrid), .... 
On the Eggs and Larvae of the Fleuronectid, termed B — The Long 
317 
Rough Dab ? ....... 
319 
3. 
On an Unknown Egg and Larva, ..... 
320 
4. 
On an Unknown Egg with an Oil-Globule which occurs at the ventral 
border of the Yolk in the Larva, ..... 
321 
5. 
On an Abnormal Egg of the Grey Gurnard, .... 
322 
6. 
On an Unknown Elongated Post- Larval Form with Prominent Teeth and 
Long Pectorals, ....... 
322 
7. 
On the Young Stages of Cottus, ...... 
323 
8. 
On the Y'^oung Stages of the Weever, ..... 
324 
9. 
On the Young Stages of the Gunnel, ..... 
326 
10. 
On the Development of the Lemon Dab (or so-called Lemon Sole), 
327 
11. 
On the Eggs and Early Stages of the Sand-Eel, .... 
331 
12. 
List of some of the Pelagic Ova, Larvse, and Young Fishes obtained 
by the * Garland ' in 1890 and 1891. .... 
334 
1. On the Development of the Brill, 
Few opportunities have hitherto been found either for the examination 
of the ova of the brill or its development, and accordingly the following 
preliminary account is not without interest : — 
Amongst former authors Parnell makes a brief remark, in his Fishes of 
the Forthj that the brill spawns in spring. 
Couch does not seem to have seen a ripe fish ; and Day has no infor- 
mation of his own concerning the spawning period of this fish. 
Recently Raffaele"^ gave some attention to the egg of this species at 
Naples. The floating egg was found in February and March, with a dia- 
meter of 1*33 mm., the oil globule being 0*23 mm. He describes the 
brownish pigment of the embryo in the egg, and gives a figure of a larva 
with the yolk partially absorbed (fig. 18, tav. 4), which he doubtfully refers 
to the brill. The head of this larva is certainly peculiar, the snout being 
pointed superiorly, and the oil-globule placed somewhat behind the centre 
of the yolk ventrally. The pale-brown pigment with some darker specks 
is distributed generally over the body and yolk-sac, while a patch occurs 
in the marginal fin dorsally just behind the pectorals, and a broad bar 
dorsally and ventrally about midway between the vent and the tip of the 
tail, after which the caudal region is translucent. 
The eggs of the brill were referred to in a previous report as occurring 
in February and March in St Andrews Bay,t but no ripe female bad been 
obtained. Mr Holt, J however, procured a ripe female last year off the 
* 'Le uova galleggianti, '&c., 1888, p. 48, tav. 4, figs. 8, &c. 
t Seventh Ann. Report, Part HI., p. 266 ; and Researches, p. 847. 
X Trans. Roy. Dub. Soc.j vol. iv. ser. ii. vii. p. 452, pi. 18, figs. 13 and 14. 
