310 DISCOVERY REPORTS 



Legs I and 2 chelate, small. Leg 5 with setose exopod. Epipods and a pair of arthro- 

 branchs on legs 1-4. Pleopods on somites 2-5. 



The large dorsal spine on somite 2 and the position of spines 1-3 near the end of the 

 telson are characters more of Callianassa than of Axiiis, but the great length of the 

 rostrum, presence of epipods and exopod on leg 5 justify its position in this group. 



Thalassinid D. Ill (Fig. 9) 



Discovery St. 1581. 



Rostrum 2-3 mm. ; body 6-73 mm. 



Rostrum slender, tapering, serrated nearly to end. Margin of carapace with ten 

 small spines. Abdomen : somites 2-6 with subequal dorsal spines ; pleura rounded. 



Telson nearly three times as long as wide; distal margin slightly produced, with 

 very long median spine and four spines on either side; spine formula 8, i, 8. 



a. Rostrum. 



Fig. 9. Thalassinid D. III. St. 1581. 

 b. Telson. c. Palp of maxillule. d. Endopod of maxillipede i. 



Eye narrow, oval. Antenna with small inner spine on basis, and outer basal seta on 

 scale. Palp of maxillule and maxilla of three segments. Maxillipede i ; endopod stout, 

 with outer seta on segment i. 



Chelae of leg i very large. Leg 5 with long exopod. Epipods present on legs 1-4. 

 Pleopods on somites 2-5. 



Thalassinid D. IV (Fig. 10) 



Discovery Sts. 1578, 1581. 



Rostrum 2-06 mm. ; body 9-72 mm. 



Rostrum short, broad, tapering, without teeth at end. Carapace with about five 

 large marginal spines. Abdomen: somite 2 without dorsal spine; somites 3-5 with 

 subequal spines. Pleura of somites 2-5 with two ventral points. 



Telson three times as long as wide, distal margin slightly prominent with long 

 median spine and four spines on either side; spine formula 8, 1,8. 



