LARVAE OF SERGESTES 



39 



Sergestes corniculum Form A 



Description. Elaphocaris i (Fig. 30 a). Length 072 mm. 



Anterior processes with four denticulate spines ; lateral processes with six long basal 

 spines ; posterior process swollen at base with two pairs of spines. Dorsal organ con- 

 spicuous. Branches of telson short and broad, spine 5 much shorter than spine 4. 

 A pair of small papillae on anterior margin represent the papillae of the eyestalk. Labral 

 spine short. 



Fig. 30. S. corniadum A. a, Elaphocaris i ; b, Elaphocaris 2. 



Elaphocaris 2 (Fig. 30 h). Length 1-3 mm. Rostrum 0-85 mm. 



Rostrum simple, with four pairs of long spines at base. Carapace with a pair of long 

 lateral spines and a group of about ten long spines springing from an elevation of the 

 carapace at the base of the lateral spines. Posterior margin of carapace with a dorsal 

 spine as long as the abdomen and a transverse row of 14 long spines. Dorsal organ very 

 large. Telson arms very short, as wide as long, spine 5 considerably shorter than spine 4. 



Eye very large, asymmetrical, width of eyeball greater than total length. Labral spine 

 very long. 



