24 



DISCOVERY REPORTS 



The specimen of 6-5 mm. differs in having small dorsal spines on somites 4-6, the 

 arms of the telson more slender, and the antennal flagellum shorter and without curved 

 setae. In this specimen pleopods 2-5 each have endopods without setae. 



Colour. Red patches as shown in Fig. 14 b. 



Sergestes crassus Hansen 



Hansen, 1922, p. 102, Mastigopus. 



Gurney, 1924, p. 87, fig. 25, Elaphocaris 2; p. 94, fig. 32, Acanthosoma 2. 



Material. This species is common at Bermuda. The first Elaphocaris was not 



identified, but the Acanthosoma was obtained twice by moulting from Elaphocaris 3, 



Fig. 15. S. crassus. a, Elaphocaris 2; b, Elaphocaris 3. 



and Acanthosoma i moulted to Acanthosoma 2. The connexion of Acanthosoma with 

 Mastigopus was not proved by moult, but the resemblance in form and colour is so 

 close that we have no doubt of their identity. 



Description. Elaphocaris 2 (Figs. 15 a, 16). Length 1-2 mm. Rostrum 0-91 mm. 



Carapace as wide as long, with rather short, stout lateral processes and long posterior 

 spine, reaching to end of body. Telson arms divergent, very slender, more than six 

 times as long as wide ; the spines comparatively short ; spine 5 shorter than spine 4. 



Eye rather pear-shaped, length a little more than half length of carapace. There is 

 a minute ventral papilla on the eyestalk, and, in the specimen drawn, there was a pair 

 of very small frontal organs. Labral spine very large. 



