POROELLANOPAGURUS— BORRADAILE. 



119 



E. hernhardus (Fig. lOc) has appendages of moderate size on the third, fourth, and fifth 

 segments of the male. E. prideauxi (Fig. lOrf), however, shows only simple, micro- 

 scopic vestiges of these limbs. It is interesting to note that in the male E. hernhardus 

 the appendages in question are biramous with one branch reduced, but that this is the 

 endopodite, whereas in the female of Porcellano-pagurus it is the exopodite that has 

 undergone reduction. Chilton describes the male of P. edwardsi, and as he makes no 

 reference to any abdominal limbs save the uropods, it is probable that the latter alone 

 are present. Balss, however, figuring what he states to be the male of P. japonicus, 

 shows three unequally biramous limbs on the same segments as in the female. It is 



Fig. 10. — Dorsal views of the limb of the third abdominal segment in Eupaguriaae — 

 A, Porcellanopagurus, sp., J , X 6 ; B, Eupacjurus hernhardus, ? , X 5 ; C, the 

 same, $ , X 5 ; D, Eupagunis prideauxi, ^ , x 8. ex, Exopodite ; v, vestige of 

 pleopod ; t, postero-external angle of tergum. 



possible that he may be mistaken in the sex of his specimen, but in that case it is 

 to be observed that, as they are represented in his figure, the reduced rami appear to 

 be the endopodites as in male E. lernhardus. If the male of P. japonicus be rightly 

 figured by Balss, then there is in Porcellanopagurus a diff'erence between species in 

 regard to the development of the abdominal limbs of the male, as there is in Eupagurus. 

 The question needs reinvestigation. 



The uropods (Fig. 6) of the two sexes are alike, and resemble those of the ordinary 

 hermit-crabs, except in that they are almost completely symmetrical in shape and not 

 very asymmetrical in position, though they are still obviously placed at an angle with 



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