368 K. S. CLARK. 



diameter of the eye. The dorsal and anal fin rays have advanced con- 

 siderably and stretch half-way across the fin membranes, though not 

 sufficiently clear on the distal portions of the fins to be counted with 

 accuracy. Vertebrae number approximately 9+37. The notch in 

 front of the origin of the dorsal fin is much more conspicuous. It 

 overlies the region of the mid brain. The interspines have extended 

 forwards. The tip of the notochord is bent upwards, and the caudal 

 rays are developed : twelve rays can be counted. 



A few stellate chromatophores have collected round the two large 

 separate dorsal fin chromatophores at positions corresponding to the 

 future pigment bars. The first anal bar is also suggested by an aggrega- 

 tion of similar chromatophores at the beginning of the anal fin. 



• 



(^y- M 





vV^ . : : ..'■:H'^'!''^^'- 





Fio. 7. — Solca lascaris. Length 7*75 mm. OiUiona Station, CLXXII. A. 26th Sept., 

 1913. Total depth 27 fms. Midwater haul. 

 Del. E. Ford. 



Fig. 8. Length 8-7 mm. 

 Length 8-7 mm., of which 5-69 mm. are post-anal. The anus is thus 

 well in front of the middle line. Length of snout ca. -5 mm. (measured 

 from tip of upper jaw) ; diameter of eye ca. 4 mm. The greatest depth 

 is slightly more than the preanal length. Length of air bladder about 

 equal to snout length. 



Fin formula D ca. 89. 

 A ca. 73. 



Vertebra 9+ca. 38=ca. 47. 



The snout is more rounded and swollen anteriorly, and extends 

 backwards to the origin of the dorsal fin membrane, which pro- 

 jects as a small knob in front and above the mid brain, the anterior 

 margin of which is in line with that of the orbit. The dorsal interspines 

 have advanced to a level with a vertical line through the middle of 



