756 DR WALTER E. COLLINGE. 



(75) Tattersai.l, W. M., "The Marine Fauna of the Coast of Ireland," part v, Isopoda, Fisheries, Ireland, 



Sci. Invest, 1904 [1905], pp. 1-90, pis. i-xi. 



(76) "Die nordischen Isopoden," Nordisches Plankton, Kiel, 1911, pp. 181-313, figs. 1-340. 



(77) Thomson, Geo. M., " Descriptions of New Crustaceans," Trans. Proc. New Zealand Inst., 1884, vol. xvi, 



pp. 234-240, pis. xii, xiii, figs. 1-5. 



(77a) "A new Family of Crustacea Isopoda," Ann. and Mag. Nat. Hist., 1904 (s. 7), vol. xiv, pp. 66- 



69, pi. i. 



(78) "Weber, M., "Die Isopoden gesammelt wahrend der Fahrten des Wdlem Barents in das nordliche 



Eismeer," Bijdr. Dierk., 1884, pp. 1-39, 3 pis. 



(79) White, Adam, List of the Specimens of Crustacea in the Collection of the British Museum, London, 



1847. 



EXPLANATION OF PLATES. 



(All the figures are drawn from male specimens, unless otherwise stated.) 



Idotea baltica (Pallas). 



Fig. 1. Dorsal view of the cephalon. x 7. 



Fig. 2. Dorsal side of the left antennule. x 20. 



Fig. 3. Terminal style of the antenna. x 110. 



Fig. 4. Dorsal side of the left antenna. x 11. 



Fig. 5. Ventral side of the terminal portions of the inner and outer lobes of the right first 



maxilla. x 130. 

 Fig. 6. Ventral side of the right maxillipede. x 21. 

 Fig. 7. Portion of the third and fourth joints of the right maxillipede, showing the thickened edge of 



the latter and the groove on the former. 

 Fig. 8. Ventral view of the second thoracic appendage. x 14. 

 Fig. 9. Claw of same enlarged. 



Fig. 10. Ventral view of the eighth thoracic appendage. x 10. 

 Fig. 11. Claw of same enlarged. 



Fig. 12. Dorsal view of the lateral portions of the mesosomotic segments, showing the coxal plates. x 35. 

 Fig. 13. Dorsal view of the metasome. x 5. 

 Fig. 14. Left uropod. x 7. 



Idotea pelagica, Leach. 



Fig. 15. Dorsal view of the cephalon. x 7. 



Fig. 16. Dorsal side of the left antennule. x 30. 



Fig. 17. Dorsal side of the left antenna. x 16. 



Fig. 18. Terminal style of the antenna. x 110. 



Fig. 19. Ventral side of the terminal portions of the inner and outer lobes of the right first 



maxilla. x 130. 



Fig. 20. Ventral side of the right maxillipede. x 21. 



Fig. 21. Ventral view of the second thoracic appendage of p. x 9. 



Fig. 22. Ventral view of the eighth thoracic appendage of £> . x 6"5. 



Fig. 23. Dorsal view of the lateral portions of the mesosomatic segments, showing the coxal 



plates, x 35. 



Fig. 24. Dorsal view of the metasome. x 5. 



Fig. 25. Left uropod. x 7. 



Idotea neglecta, G. O. Sars. 



Fig. 26. Dorsal view of the cephalon. x 7. 



Fig. 27. Dorsal side of the left antennule. x 30. 



