i88 



FAM. PRISTIPOMATIDAE. 



DENTEX ARGYROZONA. C & V. (SILVER FISH). 



The maximum diamettr of 50 eggs examined was "89 mm. ; 

 the minimum '83. Most of the eggs (^ths) showed distinct 

 cross markings on the zona radiata. Of the eggs examined 

 those with weakly marked striae were all under the average in 

 diameter. All striae became fainter as development proceeded. 

 Yolk clear, one dark oil globule '2 mm. in diameter. 



The following will illustrate the rate of development at a 

 temperature of 75" Fahr. and may be compared with the 

 previous cases ai 65" Fahr. Fertilized at 11-55 '^•'^^' ^^^^ 

 December : — 



Germinal cavity appeared ... ... ... 10.45 P-^^^- 



Blastopore closed ... ... ... ... 6,15 a.m. 



Kupffer's vesicle appeared ... ... ... 7 a.m. 



Pigment cells appeared on body ... ... 2.30 p.m. 



„ ,, ,, on oil globule ... 4 p.m. 



Otocyst and movement of embryo ... ... 4.35 p.m. 



Two per cent, of eggs hatched ... ... 9.30 p.m. 



Colour of larva : greenish yellow pigment behind the eye 

 and slight spots of the same colour on the dorsal aspect of the 

 trunk, posterior angle of rectum and posterior of yolk sac at 

 oil globule. Black pigment : slight traces appear between 

 rectum and end of tail under the body. Dorsal and ventral 

 tin without colour. The larva is on the whole characterised 

 by feeble development of pigment. In general shape it 

 resembles that of the White Stumpnose, the anus, however, 

 being about half way between tip of snout and end of the tail. 

 The oil globule is postero-ventral. The anterior margin of the 

 yolk sac is in about the same vertical as the end of the snout, 

 sometimes in front, sometimes behind. 



FAM. SPARIDAE. 



PAGELLUS MORMYRUS. LINN. (ZEVERRIM OR 

 ZEE-BASJE). 



The diameter of ten eggs was '88 mm., oil globule 'iG mm. 

 Fertilized 11.15 a.m. 15th January, 1900, (76" Fahr); at 

 6 p.m. germinal cavity appeared ; at 9-20 p.m. the blastopore 



