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Part III. — Tenth Annual Report 
are all distinct. The pectorals are larger, and are used for balancing. 
The skin is minutely vesicular, and the canary-yellow pigment is con- 
spicuous in the posterior part of the body. 
So far as can be ascertained, the foregoing larva differs from any form 
described by Dr Raffaele. Professor Marion, however, in the recent 
publication already quoted, gives an excellent figure of a larval form 
which was hatched on the 1st of May, and which he associates with the 
gurnards, from its resemblances to the larvae of such forms as T. aspera, 
T. gurnardus, and T. cuculus. It, he says, evidently pertains to another 
species, and hence he doubtfully diagnoses it as the larva of Trigla 
corax.(T) If, however, his figure be carefully compared with the larva of 
Arnoglossus megastoma, a much closer resemblance will be found to this 
species than to any example of the genus Trigla. Thus the characteristic 
black chromatophores of the dorsal and ventral marginal fins, the slightly 
elliptical outline of the oil-globule in lateral view, the pre-anal marginal 
fin, and the shape of the head, all lean to the type indicated. My dis- 
tinguished colleague at Marseilles will, I am sure, be the first to criticise 
his own interpretation when he is able to secure the ova of Arnoglossus 
and rear the larva? ; and also to contrast the larva? of Motella with the 
unknown pleuronectid of the 24th February given in fig. 12 of his Pi. I. 
Pew have any idea of the .difficulties which observers at present encounter 
in their examination of such forms — difficulties to which I have already 
alluded in the opening paragraph of this report. 
9. Additional Remarks on the Development of the Brill. 
In last year's Report figures were given of the egg of the brill, (1) with 
the embryo just outlined, (2) of the egg shortly before hatching. The 
larva was also figured. These eggs, however, were all fertilised by the 
milt of a turbot, as no male brill could be procured. This year the 
attendant at the laboratory (A. W. Brown) forwarded, from Aberdeen, 
eggs of the brill fertilised by the male of its own species, so that an 
opportunity was given for revising the observations of last year. 
The ova were procured off Aberdeen on the 22nd May 1892, and 
measured about 1*3335 mm., the oil-globule having a diameter of 
•2286 mm. They thus agree closely with the Mediterranean examples, 
sis well as with those obtained by Mr Holt on the West Coast of Ireland. 
Raffaele's diagnosis, therefore, of the eggs he met with in February and 
March in the Bay of Naples was correct, the pigment being very abundant 
jn the larva. The size of these nearly corresponds, but those received from 
Montrose last year were larger (P4097). It has to be remembered, 
however, that different micrometers and different microscopes were used. 
They reached the laboratory on the 24th, and at 11 a.m. the disc showed 
large spheres (PI. XVI. fig. 14), which, however, may be due to irregularity 
or an abnormal condition, while the periblast around was studded with 
nuclei. The oil-globule behaved as in the gurnard, rolling under the 
periblast and beneath the disc, and passing through the yolk when 
suddenly inverted. 
Next day (25th) the germinal cavity was apparent (PI. XVI. fig. 15), and 
the disc covers a smaller area than in the specimen figured above. Around 
its margin are numerous cells and granules. The eggs are delicate, and if 
exposed in a small quantity of water in a cell for a short time perish, the 
protoplasmic covering of the yolk peeling off, shrinking on the embryo, and 
becoming opaque. On the 27th, at 11 a.m., the embryo had lenses, otocysts, 
and the tail projected from the yolk, while a yellowish hue pervaded the 
