554 



THE VOYAGE OF H.M.S. CHALLENGER. 



about a third of their length from the base, and these long processes are armed from 

 base to summit with short teeth or spines, on both sides on the basal undivided portion, 

 and on one side on the branches. The frontal margin between them is concave. The 

 lateral margin between these spinous processes and the posterolateral ones is also 



Fie. 49. — Elaphocaris suhmi. a 1 , first pair of antennae ; a-, second pair of antenna ; oc, incipient ophthalmopod ; 

 pmx 1 , first pair of maxilla ; ma; 2 , second pair of maxilla ; mxp, maxillipedes ; gn 1 , first pair of gnathopoda ; !,Jintestinal 

 canal ; as, anal foramen. 



concave, sweeping gradually backwards and projecting outwards on each side to a 

 long single spinous process, which is armed near the base on its frontal margin with two, 

 ami beyond this, on its posterior margin, with several short sharp teeth, similar to those 

 on the anterior spines. From the' base of these processes the margin of the carapace slopes 



