A. K. HEFFOKD. 



Sen-anus cabiUla, I„ The Gaper. 



lUrFAELK (20. p. 19, Tav. I, Fig. 5, Tav. 11, Figs. 1 and 3. 

 Holt (lli\ p. 11, PL IV, Figs. 33-40. 



Four ^jgs with homogeneous yolk and single oil-globule were taken 

 on August 27th and six on August 30th. in each case in plankton 

 caught bv the young-fish trawl in "NVhitsand Bay. In both eases the 

 eggs soon developed unhealthy symptoms, and the characters of the 

 embryo and larva must be considered with this condition borne in 

 mind. The diameter of the eggs ranged from 092 mm. to 0"97 mm. 

 and the size of the oil-globule from 014 to 01 5 mm. Before the 

 formation of the embryo the surface of the yolk presents a roughened 

 appearance, which may be due to a slight granulation in the peri- 

 blastic region (^cf. Holt, ojk cit., p. 121 Just before the outgrowth of 

 the free caudal region a few round, pale yellow chroma tophores have 

 appeared along the sides of the embyro, and smaller, somewhat in- 

 conspicuous dark stellate chromatophore^ are fairly imiformly dis- 

 tributed all over the body. As development proceeds the pigment 

 spot^ increase in size, single yellow chi-omatophores by the anus and 

 in the mid-post-anal region being well marked. There is a little 

 pigment of each colour over the oil-globule, but none on the yolk-sac. 

 The hatched-out larvae were moribund in every case. The length of 

 the newly hatched larvae V^ig. 1-3) varied from 1 84 to 2 30 mm. The 

 largest and most whole specimen measured 100 mm. from the snout 

 to the posterior edge of the yolk-sac, and 126 mm. from snoiit to 

 anus. The post anal length of 1*04 mm. should have a trifle added to 

 it to allow for the slight shrinkage which had taken place. The 

 pigment has a very characteristic distribution, but varies somewhat 

 in the size and number of the chromatophores. Black pigment is 

 confined to the dorsal (^anteriorly it may be dorso-lateral » region of 

 the head and trunk, extending as a dorsal line to the caudal extremity. 

 The yellow, which by transmitted light shows a greenish tint, is con- 

 fined on the body itself to a few rather widely separated chromato- 

 phores of large size. In an average case there are one on the head ; 

 one behind the otic region : two in the pre-anal dorsal line ; two lateral 

 spots at the level of the posterior edge of the yolk-sac : one very 

 large one over the anus and at the mid-post-anal point in the dorsal 

 and ventral contours. Kamifications extend into the unpaired fins in 

 the two latter cases. All the larvae observed showed one large dorsal 

 mid-post-anal chroma tophore, but the corresponding ventral pigment 

 may consist of as many as four chromatophores. In the dorsal fin 



