( 24 ) 



Section II.— The external maxillipeds are widely 

 separated at base : the right cheliped is usually 

 vastly larger than the left, the left is never 

 larger than the right ; occasionally they are 

 subequal - ••• • i * -• 



Section 1. Pagurin/E : the external maxillipeds are juxtaposed at base,* etc. 



A. Paired appendages present on the first two abdominal segments 



of the male and first abdominal segment of the female : 

 fingers of chelipeds opening and closing horizontally ,— 



1. Eyestalks short and stout : 4th pair of legs chelate -. Paguropsis. 

 II, Eyestalks long, slender : 4th pair of legs nonchelate ... Paguristes. 



B. No paired appendages on the anterior abdominal segments of 



either sex ; — 



1, Fingers of chelipeds opening and closing horizontally 

 (chelipeds subequal) ; — 



Clibanarius. r>-'^^ 

 Isocheles. 



Cancellus. 

 Petrocliirus. 



i. Fingers spooned : antennal flagellum long and 



not setose _. — 



ii. Fingers acuminate : antennal flagellum short 



and much ciliated _ ... _ 



II. Fingers opening and closing obliquely or nearly 

 vertically : — 



i. Chelipeds equal and modified to form an oper- 

 culum (tail-fan quite symmetrical) 



ii. Chelipeds subequal, the riglit slightly larger 

 than the left — 



iii. The chelipeds may be subequal, but the left 

 is usually vastly the larger :— 



a. Finger-tips corneous and blackened ; — 



a. Chelipeds occasionally subequal, 



but the left is usually vastly the 



larger; finger-tips somewhat l^^-^-cip,, 



spooned ... ... Pagurus. 



b. Chelipeds subequal : finger-tips 



hoof-shaped : chelipeds and next 

 two pairs of legs transversely 

 ringed or scutellated ... *Aniculus. 



• In Aniculus strigatus, a species with a very broad flat body, the external maxillipeds are considerably 

 separated at base. This is not simply the effect of the flattening of the cephalothorax ; for in Diogenes miles 

 (Herbst), with an equally broad flat body there is no such separation of the external maxillipeds 



