226 Holt & Beaumont — Survei/ of Fkhing-groiinds, W. Coast of Ireland, 1890-91. 



I'lO. I. 



-5. The five anterior gills of the right side of Nijctiphanes 

 Couchii, 3 , \2 mm., arranged in the natural order. 



6. The sixth gUl, with luminous organ and exopodite, of 



the same specimen. 



7. The seventh thoracic appendage of the same specimen. 



Three of the external gill-plumes have been cut off. 



8. Inner plate of the first pleopod of the same speci- 



men. 



9. Inner plate of the first pleopod oiyyctiphaiics norregica, 



S , 3o mm., from Upper Loch Fyne. 



All figures drawn to the same scale with camera hicida. 



