( 26 ) 



ii. A pair of appendages on the first abdominal 

 segment of the male only : — 



a. Gills eleven on either side 



b. Gills thirteen on either side 



Tomopagurus. 



^ ToMOPAGUROPSIS. 



iii. No paired appendages on the abdomen of the 

 male : — 



a. A pair of appendages on the first abdo- 



minal segment of the female _ Munidopagurus. 



b. No paired appendages on the abdomen 



of the female ; — 



a. Abdomen symmetrical and quite 



rudimentary _« _ Ostraconotus. 



b. Abdomen well-developed, spirally 



coiled ... . _ EuPAGURUs, 



II. Vas deferens produced, on one or both sides, into a 

 tube : no paired appendages on the abdomen of the 

 male : — 



i. Gills trichobranchia? (quadriserial) ; the right 

 vas deferens forms a short tube : a pair of 

 appendages may be present on the first 

 abdominal segment of the female only 



ii. Gills phyllobranchiK (biserial) : — 



a. Both vasa deferentia are protruded, the 

 left is short, the right long ; — 



a. The long (right) vas deferens ends 



in a long filament : a pair of ap- 

 pendages on the first abdominal 

 segment of the female only 



b. The long (right) vas deferens is 



sabre-shaped : no paired append- 

 ages on the first abdominal seg- 

 ment of the female _ 



b. Only the right vas deferens protrudes : no 

 paired appendages on the abdomen of 

 the female : — 



a. The right vas deferens recurves over 



the right flank on to the dorsum of 

 the abdomen ... 



b. The right vas deferens crosses be- 



ueath the abdomen and then as- 

 cends over thi left flank 



Pagurodes. 1), (ftlo 



Nematopagurus. 



-jt 



_ Catapaguroides. 



«. Catapagurus. 



_ Cestopagurus. 



