MOSER and AHLSTROM: DEVELOPMENT OF SCOPELOPSIS MULTIPUNCTATVS 



B 



D 



Figure 1. — Developmental stages of Scopelopsis multipunctatus Brauer. — A, 5.4-jnm larva, R.R.S. Discovery Sta- 

 tion 2352; B, 11.3-mm larva, R.R.S. Discovery Station 2352; C, 11.3-mm larva, dorsal view; D, 11.3-mm larva, 

 ventral view. 



The head is moderately large, its length being 

 24-28 9f (mean of 27 Cf) of the body length for 

 the larval series. The dorsal profile of the snout 

 is concave in our smallest specimen (5.4 mm), 

 but is straight in a 6.2-mm larva, and becomes 

 distinctively bulbous in later larvae and in trans- 

 forming specimens. The eyes are large in 



Scopelopsis larvae, but undergo a slight diminu- 

 tion, relative to head size, with progressive larv- 

 al development. Eye length measured vertically 

 is 38 9r of the head length in the smallest larva, 

 but decreases to SB^c in a 6.2-mm larva. This 

 dimension averages 30 ''f of the head length in 

 larvae which have completed notochord flexion, 



543 



