PLATE X. 



Fig. 



1. Hoploparia Belli (p. 39). Side view of carapace and abdomen. 



2. The same, showing the supra-antennary process, and base of external antennae. 



3. Back of carapace of the same. 



4. The caudal plates. 



5. Larger claw ; and 6, smaller claw of H. Belli, being two views of one specimen. 

 7. The fingers of a specimen of the same species, more than usually curved. 



S. Wrist, arm, and part of the hand of the same species. 



9. An abnormal form of the carapace of H. Belli, or possibly a distinct species (p. 40). 



The whole of the above are from Chalk Farm and the immediate neighbourhood, 



and in Mr. Wetherell's collection. 



10. Base of the external antenna, with the scale and the supra-antennary process, of 



Nephrops Norvec/icus, to show that in a recent astacoid, these parts are even more 

 armed than in Hoploparia. 



11, Trachysoma scabrum (p. 41). From a unique specimen in the possession of Mr. 



Wetherell. From the tunnel, near Chalk Farm. 



