^°- 3572 INDIAN OCEAN COPEPODS — CRESSET 13 



form of short claw bearing 3 spines. Second segment with 2 short 

 setae on inner margin. Mandible (fig, 34) styhform process project- 

 ing with mouth tube, armed with 4 teeth at tip. Second maxilla 

 (fig. 36) with patches of stout spinules as in figure. Maxilliped (fig. 

 37) chelate. Movable process of maxilliped opposed by immovable 

 dactylate process on preceding segment. Immovable process with 

 distal depression into which tip of movable process fits. 

 Legs 1-4 biramose with spine and setal formula as follows : 



Leg 1 (fig. 38) bearing stout spinules on both rami. Exopod 3- 

 segmented. Endopod 2-segmented. Leg 2 (fig. 39) with both rami 

 3-segmented, small spinides on both rami. Leg 3 similar to leg 4 

 except endopod last segment incompletely di\aded (fig. 40). Leg 

 4 (fig. 41) endopod 2-segmented. Exopod 3-segmented. Exopods of 

 legs 2-4 with few spinides on first segment only. Leg 5 (fig. 42) a 

 lateral lobe on thoracic segment 6, bearing 2 terminal setae, 1 sub- 

 terminal seta. Leg 6 represented by short spine incorporated into 

 area of egg string attachment. 



Egg strings uniseriate. 



Male. — Unknown. 



Remarks. — This new species can be separated from all known 

 species of the genus (except E. acanthii Scott, E. turgipes Bere, and 

 E. corrugata Bere) by the exopod of leg 2. In all other species the 

 exopod is unusually long and somewhat recurved (compare figs. 29 

 and 39). E. pollex can be separated from the other 3 species by the 

 segmentation of the legs. In E. acanthii and E. corrugata the exopods 

 of legs 1-4 are 2-segmented. In E. pollex the exopods of legs 2 and 

 3 are 3-segmented. The endopod of leg 4 of E. turgipes is 3-segmented. 

 It is 2-segmented in E. pollex. 



Habitat: Gill filaments. 



The name pollex, from Latin, meaning "thumb," refers to the shape 

 of the endopods of legs 2-4. 



Kroyeria gracilis Wilson, 1932 



Collections: From 3 specimens of Carcharinus leucas from Nosy Be; 

 from 1 specimen of the same host from station 409; from 1 specimen 

 of Carcharinus longimanus from station 291. 



Habitat: GiE filaments. 



This copepod has been reported from a wide range of hosts and is 

 probably cosmopolitan in distribution. 



