MR. E. J. MIEUS ON THE IDOTEID^. 85 



Fig. 10. Outer view of opercular valve of the same, magnified. 



11. Idotea lacustris, Thomson ?, from a specimen from Port Henry, Straits 



of Magellan, X 4 diam. 



12. Opercidar valve of the same, X 7 diam. 



Plate II. 



Fig. 1. Idotea Whitei, Stimpson ?, dorsal view (from a specimen in the collec- 

 tion of the Paris Museum), X 2 diam. 



2. Lateral view of the same, showing the form of the epimera, X 2 diam. 



3. Opercular valve of the same, outer view, further magnified. 



4. Idotea indica, M. -Edwards, dorsal view (from the type in the Paris 



collection), X If diam. 



5. Opercular valve of the same, X 2 diam. 



6. Idotea Peronii, M.-Edwards, dorsal view (from a specimen from 



Flinder's Island), X H diam. 



7. Opercular valve of the same, outer view, X 2 diam. 



8. Idotea lobata, White (iued.), dorsal view (from the unique type example 



in the collection of the British Museum), X 4 diam. 



9. Opercular valve of the same, outer view, X 10 diam. 



Plate III. 



Fig. 1. Edotia hirtipes, M.-Edw., var! Icsvidorsalis, n. var. (from a specimen 

 from Jatiyama Bay, Japan), X I5 diam. 



2. Opercular valve of the same, outer view, X 3 diam. 



3. Edotia tuberculata, Guerin-MeneviLle, dorsal view, X 2 diam. 



4. Maxillipede of the same, greatly magnified. 



5. Greatly magnified view of part of the antenna of the same, showing 



rudimentary flagellum. 



6. Opercular valve of the same, outer view, considerably magnified. 



7. Cleantis {Erichsonia) filiformis (Say)?, dorsal view (from a specimen 



in the Paris collection), greatly magnified. 



8. Opercular valve of the same, dorsal view, considerably magnified. 



9. Cleantis (Cleantis) isopvs, Grube (ined.), dorsal view (from a specimen 



in the British-Museum collection), X 2 diam. 



10. Lateral view of the same, showing the form of the epimera, &c., 



X 2 diam. 



11. Opercular valve of the same, X nearly 4 diam. 



