226 Horr & Beaumonr—Survey of Fishing-grounds, W. Coast of Ireland, 1890-91. 
icc 
Fries. Fics. 
1-5. The fiye anterior gills of the right side of Nyctiphanes | 8. Inner plate of the first pleopod of the same speci- 
men. 
Couchii,  , 12 mm., arranged in the natural order. 
6. The sixth gill, with luminous organ and exopodite, of 9. Inner plate of the first pleopod of Nyctiphanes norvegica, 
the same specimen. | 3 , 35 mm., from Upper Loch Fyne. 
7. The seventh thoracic appendage of the same specimen. | 
| 
Three of the external gill-plumes haye been cut off. 
All figures drawn to the same scale with camera lucida. 
