52 A. E. HEFFORD. 



Two post-larvae, measured soon after the yolk had been absorbed, 

 had lengths of 4'8 and 4"9 mm. The jaws had appreciably developed, 

 especially the mandible, so that the earlier sub-terminal position of 

 the mouth was changed; but otherwise they resembled the newly 

 hatched individuals. The differences between my specimens and those 

 recorded by Holt are in size and pigmentation. His newly hatched 

 larvae measured 2'97 to 3"15 mm., and apparently had no yellow pig- 

 ment {op. cit., p. 448). His eggs were slightly smaller than mine, 

 having a length of 1*37 mm., a breadth of I'OS mm., and a height of 

 0'68 mm., and the oil-globule measured 0*24 mm. Guitel (9, PI. XXV, 

 Fig. 8) figures an early post-larval Z. himacnlatns of uncertain age, 

 which is about 4'6 mm. long and is pigmented somewhat similarly to 

 those I have examined, except that the superior line of yellow 

 chromatophores is not clearly shown on the side and the black chro- 

 matophores are lacking in the anal fin. As regards Holt's specimen, 

 if it is the same species as those I have examined, I can only suggest 

 that it may have been an abnormal specimen, possibly prematurely 

 hatched under unfavourable conditions. 



Zejyad Of/aster gouani, Lacep. Cornish Sucker. 



On the 17th June several batches of the eggs of this species were 

 taken on the underside of flat stones between tide-marks on Wembury 

 Eeef. The parent fish was always to be found near, and generally 

 close alongside the eggs, which cover several square inches of the 

 stone with a closely applied layer. Two, three, or four stages of 

 development may be seen in one batch of eggs. In the earliest stages 

 the yolk is bright amber coloured, which renders the mass of ova an 

 object of much conspicuousness and beauty. Subsequently the colours 

 become gradually darker to orange, and finally, when the embryo is 

 advanced, they have in the mass an olive-green appearance. The egg- 

 capsule is oval-shaped with flattened base, of length 190 mm. and 

 breadth 1"56 mm. The yolk contains a large oil-globule of 0'34 mm. 

 diameter. 



When a short caudal rudiment is developed, the embryo has a 

 general reddish tint, and shows many stellate black chromatophores 

 over the greater part of the body, the posterior portion, however, being 

 unpigmented. The movement of pale reddish circulatory fluid along 

 the vessels from the yolk to the heart is plainly visible. 



The newly hatched larva has a length of 5*1 mm., the anus is 

 post-median, and the yellowish yolk-sac protrudes on either side of 

 the anterior abdominal region. The straight gut shows internal con- 

 volutions and a yellowish green gall-bladder is visible. The dorsal 



