LARVAE OF SERGESTES 



37 



Description. Elaphocaris i (Fig. 28 a). Length 0-64 mm. 



Anterior process quadrifid at end. Lateral process curving backwards, with seven 

 spines. Posterior process with two pairs of spines. Dorsal organ present, small. Telson 

 arms divergent, slender, spine 5 of same length as 4. 



Elaphocaris 2 (Fig. 28 b-d). Length about i mm. Rostrum 0-64 mm. 



Rostrum as long as carapace, swollen at base, where it bears four spines dorsally on 

 either side. Lateral process long, hispid, directed backwards. The hispid margin is 

 continued forwards into a rounded prominence, or " epaulette ". Posterior process long, 

 rather swollen at base, and hispid. 



Eye rather short, pear-shaped, the eyeball not distinct from the stalk, which bears a 

 small anterior papilla. 



The only specimen seen is one moulted from stage i, and the abdomen and telson 

 are not fully formed. 



Elaphocaris 3 (Fig. 28 e,f). Length 2-3 mm. Rostrum i-i2 mm. 

 Rostrum shorter than carapace and without the basal sweUing of stage 2. Supra- 

 orbital spines about as long as eyes, with long slender 

 spinules. Lateral and posterior processes as in stage 2. 

 Abdominal somites with small sharp pleural points. 

 Telson arms divergent, slender, about twice as long 

 as wide, the spines rather short. Eye slender, pear- 

 shaped, as in stage 2, and with papilla. 



Colour. In stages i and 2 there are patches of red 

 in a ground of brownish orange at base of the lateral 

 and posterior processes. In stage 3 the red colour is 

 more pronounced and there is red in the eyestalk. 

 The distribution of colour in the thorax is not quite 

 the same, and there is no colour in the abdomen in 

 the specimen described. 



Acanthosoma 2 (Fig. 29). Length 5-3 mm. Rostrum 

 1-4 mm. 



Carapace a little longer than wide, with two lateral 

 spines of which the posterior pair is minute. Supra- 

 orbital spine shorter than eye. Posterior dorsal and 

 hepatic spines present. Dorsal organ very small. 



Dorsal spines of abdominal somites i and 2 very 

 small; those of 3-6 long, subequal. Lateral spines 



I and ? the longest, the latter less than half length 



^ _, , ... , Fig. 20. S. robustus C. Acanthosoma 2. 



of somite 6. Telson nearly three times as long as 



wide, with large lateral spine inserted far in front of fork. Arms of fork rather divergent, 



much shorter than anterior part of telson, and with two outer and three or four inner 



spines. 



