LARVAE OF SERGESTES 



15 



and 3 the brown-orange colour has extended over the sides of the thorax and abdomen, 

 and the red in the gastric region is enlarged. The brown-orange colour is very distinctive. 



Z^ 



Fig. 7. S. comutus. a, Elaphocaris 3 ; b, rostrum, side view. 



Acanthosoma i (Fig. 8 a, d). Length 3-5 mm. Rostrum 0-96 mm. 



Rostrum longer than antennule, with numerous lateral spinules. Supraorbital spines 

 longer than eyes. The two pairs of lateral spines stout, with many long lateral spinules. 

 Hepatic spines very stout, with many spinules. Posterior spine small, spiny. Dorsal 

 organ a very small papilla. 



Abdominal somites with very long dorsal spines. Lateral spines very long, that of 

 somite 2 the shortest, and 3-5 increasing in length. No median ventral spines. Telson 

 long and slender, its branches reaching nearly to end of uropods. Length to base of 

 fork twice the width, with long slender lateral spines. Arms of fork slightly divergent, 

 about three-quarters length of telson, with two outer and two inner spinules. 



Eye very large and asymmetrical, total length of eye nearly one-quarter of length of 

 body. Antennal scale with four apical setae not very distinct in size from the inner 



