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PLATE I. 



Fig. 1. Cancer payui-us, from above. Small specimen. 



Fig. 2. C. iMiyiints, female, from below. Only the 

 stumps of the pereiopods are shown. This 

 figure shows the shape of the abdomen, and 

 also the " pleural groove." x l. 



Fig. -J. C. pagurus, male, from below. Only the 

 stumps of the pereiopods are shown. x i. 



PLATE II. 



Fig. 4. First antenna (antennule) of right side, seen 

 from below. x 2. 



4 



Fig. 5. Eight second antenna, from below. x 2. 



Fig. 0. Right mandible, from below. The apophysis 

 is also shown with the tendons of the external 

 adductor, the internal adductor and the 

 external abductor muscles. x 1. 



Fig. 7. Right first maxilla, from below. x 1. 



Fig. 8. Right second maxilla and scaphognathite, from 

 below. x 1. 



Fig. 9. Right first maxillipede, from below. x 1. 



Fig. 10. Right second maxillipede, with podobranch, 

 from below. x 1. 



Fig. 11. Right third maxillipede, with podobranch, 

 below. x 1. 



Fig. 12. Anterior view of the right chela (first pereio- 

 pod). x 1. 



Fig. l-j. Aaterior view of the right third walking leg 

 ! fourth pereiopod). x 1. 



Fig. 14. First abdominal appendage of male of right 

 side. x 1. 



Fig. 15. Second abdominal appendage of male of right 

 side. x 1. 



Fig. 10. First and second abdominal appendage of male, 

 viewed from left side. x 1. 



Fig. 17. Anterior view of a right abdominal appendage 

 of female, x 1. 





