DISCOVERY REPORTS 



with a group of six spines on each side of this basal part, but none on distal part. Labrum 

 with long spine. Eye small, with slender stalk. 



Elaphocaris 3 (Fig. 2). Length 176 mm. Rostrum i-omm. 



Rostrum about i i times length of carapace, without lateral spines, but with three long 

 ventral spines. Supraorbital process very long, curving inwards to meet and overlap 

 the process of the opposite side, and armed with about 15 spines. Lateral process long 

 and slender, with 17-20 spines. Posterior process spring- 

 ing from a large sweUing which bears 16 spines arranged 

 in a circle. 



Abdominal somites with pleural spines. Telson branches 

 very divergent, slender. 



Eyeball large asymmetrical, on long slender stalk ; total 

 length of eye nearly equalling length of thorax. 



The figure of this stage is taken from a specimen which 

 began to moult while the drawing was being made ; the 

 abdomen has been drawn in from the moulted skin, and 

 is probably shown too elongated. 



Colour of Elaphocaris. Body colourless except for a 

 large patch of vermilion in gastric region. The exopod of 

 the antenna in stage 3 may also be red. 



Acanthosoma i (Fig. 3 a, b). Length 2-8-3 -2 mm. 

 Rostrum 1-25 mm. 



Rostrum longer than antennule, nearly smooth, with ^^^ ^ ^ atlanticus. Elaphocaris 3. 

 very small basal spine. Supraorbital spine very nearly 



as long as eye. Hepatic spine long. Lateral spines and posterior dorsal spine long, with 

 small prickles. Dorsal organ a small papilla. 



Abdominal somites with dorsal spines increasing from i to 4, those of 5 and 6 a little 

 shorter than 4; median ventral spines absent. Lateral spines decreasing from in front 

 backwards, each with basal spine and 1-3 with rather large spinules; that of somites 4 

 and 5 very small. Telson nearly twice as long as wide, with large lateral spines ; branches 

 of distal fork slender, parallel, nearly as long as telson, with two outer and two inner 

 small spines. 



Eye about one-quarter length of body, with long slender stalk about i| times as long 

 as the greatest width of the very asymmetrical eyeball. Pigment in preserved specimens 

 very pale. There is a very small papilla near end of stalk on anterior dorsal surface. 

 Antennal scale with five stout apical setae and a small outer spine near distal end (Fig. 3 b) ; 

 flagellum nearly as long as body, fully segmented. Pleopods small. In one specimen, 

 moulted from the Elaphocaris, pleopods 2-5 have very small inner lobes which one 

 would suppose to be rudiments of endopods ; but these are absent in next stage from 

 all but pleopod 5. Exopod of uropod slender, setose part i-6 times as long as bare part. 



Colour. Vermilion in gastric region only, and at end of antennal flagellum. 



