30 



DISCOVERY REPORTS 



apparently variable, either with rudimentary endopod on 2-5, or with rudiment only 

 on pleopod 5. 



Colour. The rich colour of the larva makes it very conspicuous. The carapace has 

 a general faint pinkish hue, with a darker margin of brown or red-brown. Both branches 

 of the uropod red-orange. Antennae, both scale and flagellum, red, and legs red and 

 yellow. 



Fig. 22. S. robustus. Acanthosoma 2. a, dorsal ; b, ventral. 



Larvae in the Acanthosoma stage belonging to the Elaphocaris described above, from 

 the north Atlantic, differ from Bermudan specimens in having the setose margin of the 

 uropod about i \ times as long as the bare part in stage i . In other respects the agreement 

 is exact. A single specimen of Acanthosoma in stage i from Discovery Station 703 

 (7° 17' N, 28° 02' W) has the same form of uropod, but differs in its small size (2-85 mm. 

 without rostrum) and in having a longer eye, with the eyeball larger in proportion. 



Mastigopus I (Figs. 23 and 24). Length 4-2 mm. Rostrum 072 mm. 

 Rostrum reaching to end of segment 2 of antennule ; basal spine reduced to a small 

 hair. Length of carapace more than twice the width. Supraorbital spine in the single 



