16 A. E. HEFFORD. 



intense line runs along the ventral contour of the trunk. Over the 

 surface of gut and yolk-sac is a diffuse covering of pale yellow and 

 faint dendritic black markings. The pectoral fins are intensely yellow, 

 with black etching-like markings round the margin in radial arrange- 

 ment. On the unpaired fins there are large dendritic black and 

 yellow chromatophores, distally distributed for the most part. In the 

 anal fin all the pigment is marginal, while in both dorsal and anal 

 there are fine, black, pectinate markings along the edge of the tin, similar 

 to what is seen in Zeugoptcrus norvcgicus. 



A third Trigla egg of 1'34 mm. diameter was taken on 12th July, 

 Ih miles south of Rame Head. The embryo had formed, but the oil 

 was still in two globules of 23 and 013 mm. diameter, which joined 

 to make a single globule next day. On the fourth day the larva 

 hatched out. Its total length is now 4"45 mm., the pre-anal length being 

 1'75 mm. In general form and pigmentation it resembles the larva 

 above described, which was observed at a somewhat older stage. It 

 differs slightly from that, however, in having less black pigment in the 

 dorsal and anal fins, nor is the marginal pigment of the pectoral fin as 

 strongly marked. Next day its length has increased to 474 mm. and 

 the yolk is almost absorbed. The pectoral fins are much larger and 

 now show the marginal fringe of black very plainly. The mouth has 

 become distinctly enlarged and already has the characteristic gurnard 

 form. Two days later, on the 19th, the larva, with but a very small 

 amount of yolk left unabsorbed, has lost the brilliant yellow colouring 

 of the younger stages. It is still fairly well marked, although diffuse, 

 over the dorsal surface of the head and trunk, but less distinct over 

 operculum, along the sides of the pre-anal part of the trunk and on the 

 pectoral fins. In the unpaired fins the marginal pigment is much 

 reduced. Black pigment has increased, especially on the pectoral fins, 

 which it now covers from margin to basal part, but the marginal fringe 

 is still the most dense. Dendritic chromatophores occur at intervals 

 along the margin of the dorsal fin, but are very sparse on the anal fin 

 except in the hypural area, where there is a rich supply arising at the 

 ventral edge of the tail and ramifying over the fin membrane. On the 

 corresponding dorsal side there is a faint indication of the same thing. 

 Fine dendritic chromatophores occur on the body, being most con- 

 centrated along the dorsal contour of the gut and along the ventro- 

 lateral part of the post-anal region. Large otocysts containing rela- 

 tively small otoliths are situated immediately behind the eyes. The 

 large fan-shaped and heavily pigmented pectoral fins, and the head 

 which is conspicuous from its well-developed jaws and operculum, give 

 this larva a very characteristic appearance. 



