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Part III. — Ninth Annual Report 
vent occurs a short distance behind the yolk-sac, thus leaving a short 
pre-anal marginal fin. The general arrangement of pigment, which is 
bright canary yellow, is indicated in Prof. Prince's figure just referred to. 
If viewed from the ventral surface the newly hatched larva (Plate XIII. 
fig. 5) is dotted all over with the yellowish chromatophores, which have 
not yet thrown out processes, and the position of the oil-globule is 
diagnostic. It floats for the most part with the yolk-sac uppermost, 
as shown in the latter figure, only wriggling a little now and then. 
In this form also the movements of the heart are not visible on 
extrusion. The development of the glandular vesicles in the skin, as 
indicated in the figure of an older larva in the Researches (PI. XVII. 
fig. 4) is another prominent feature. The oil-globule is carried slightly 
forward during the absorption of the yolk, and a marginal series of 
yellowish chromatophores occurs in the fin dorsally and ventrally. 
Its relationships are yet undetermined, but it probably pertains to a 
fish by no means infrequent in the neighbourhood. 
5. On an Abnormal Egg of the Grey Gurnard {Trigla gurnardus). 
On the 9th of April 1890 (PI. V. figs. 3 and 4) an egg was procured 
in the bottom-net which, from the presence of five oil-globules, somewhat 
resembled that of a weever. On measuring it, however, Mr Holt ascer- 
tained the following particulars for me : — 
Diameter, . . . . . . . 1 '28 mm. = -055 in. 
of largest oil-globule, . . "22 mm. = "008 in. 
„ of two lesser oil-globules, . . '17 mm. = '006 in. 
of smaller oil-globule, . . . 'll mm. = '004 in. 
„ of smallest oil-globule, . . . '08 mm. = -003 in. 
The smoky appearance of the oil-globules, and the general character of the 
egg, showed that it was an abnormal egg of the grey gurnard. This was 
fully proved by the structure of the embryo. In the figure made on the 
3rd April (PI. XII. fig. 3) the blastoderm has covered two-thirds of the 
yolk; but when the pigment had begun to develop, and the embryo 
was advanced (PI. XII. fig. 4), only two oil-globules were visible, each 
having a protoplasmic investment with various vesicles at their borders, 
and the pigment-specks of the yolk-sac over their surface. The embryo 
developed normally up to the 18th April, but died before hatching took 
place. 
6. On an Unknown Elongated Post-Larval Form with Prominent 
Teeth and Long Pectorals. 
In the mid-water net of 20th July 1889 a peculiar post-larval form, 
which differs from anything hitherto seen, was obtained. In spirit (PI. 
XIL fig. 8) it is about 7 mm. in length. The head has a pair of large 
eyes, and the mandible is prominent below the open mouth. From the 
somewhat truncated condition of the premaxillary region, however, the man- 
dible, when closed, was probably bent obliquely upward. Both premaxillary 
region and mandible are truncated in front ; presenting, indeed, a nearly 
straight margin, the outer ends in each*case forming a prominence (Pi. XL 
fig. 6), In the mandible the latter gives origin to one or two sharp 
teeth, the tips projecting beyond the mucous membrane. !No others 
occur in the lower jaw. The transverse line is somewhat shorter in the 
premaxillary region, and a long sharp tooth occurs in each papilla, the tip 
just reaching the mucous surface. After an interval externally is another 
