304 PROCEEDINGS OF SOCIETIES. 



PLATE XXI. 



ALSO ILLUSTRATIVE OF DR. KINAHAN'S PAPER. 

 Fig. 



1. External antennae of Porcellio pruinosus (immature), a, Tige. 



2. External antennae of P. scaler (immature). 



3. Antennae of Armadillium vulgar e. (a) Internal, (b) External. 



I, Tige. 



4. Peduncle and tige of external antennae of Philoseia muscorum. 



5. External antennae of Oniscus fossor. 

 5a. Tige of 0. murarius (immature). 



6. Abdominal false feet of 0. fossor. 



7. Terminal rings of 0. fossor. 



8. Ditto, Porcellio scaler. 



9. False feet of Armadillium vulgar e. The numerals are omitted from 



this figure. 

 10. Last rings of abdomen of ditto. 

 1 1 and 12. Back views of heads of ditto. 



13. Front views of ditto. Incorrectly numbered as 12. 



1 4. External and internal antennae of Ligia Porsoni (after Lereboullet). 



Vide page 258. 



