Gatty Marine Lahoralory, St. Andrews. 67 



postei'ior liook almost identical with the foregoing, so that 

 its distribution may he extensive, though the absence of 

 branchicc and other parts in the Arctic fragment leave a 

 margin of doubt. 



EXPLAXATIOX OF THE PLATES * 



Platk I. 



Fig. 1. Dorsal aspect of the region of the collar and the branchial base 



in Sdbella murra;/i, sp. n., from H.M.S. 'Knight Errant.' 



Enlarged under a lens. 

 Fiff. 2. Lateral view of the same region. 

 Fir/. 3. Slightly winged dorsal bristle of the longer type. x Zeiss 



oc. 4, obj. D. 

 Fiff. 4. Spatulate bristle with filament at the tip. Ditto. 

 Fiff. 6. Posterior bristle. 

 Fiff. 6. Ilemarkable anterior hook with a differentiation of the posterior 



border behind the prow and a greatly elongated shaft. 



X oc. 4, obj. D. 

 Fiffs. 7, 8. Minute biistles accompanying the long anterior hooks. 



X 4.0O diam. 

 Fiff. 9. Posterior hook of the same. X oc. 2, obj. F. 

 Fiff. 10. Anterior hook of Sahella southo.rni, sp. n., with long basal 



process, x oc. 4, obj. D, with 2-iu. draw-tube. 

 Fig. 11. Posterior hook of the foregoing with abbreviated base. X oc. 4, 



obj. D, with 1-in. draw-tube. 



Plate II. 

 Fiff. 1. Anterior winged bristle of Sahella southerni, ' Knight Errant.' 



X oc. 4, obj. D, with 1-in. draw-tube. 

 Fig. 2. Posterior bristle with longer tip. Ditto. 

 Fiff. 3, Spatulate bristle of the same. x oc. 4,, obj. D, with 1-in, 



draw-tube. 

 Fiff. 4. Anterior winged bristle of Chone duneri, Malmgren. X oc. 4, 



obj. D, with l|-iu. draw-tvibe. 

 Fig. 5. Spatulate bristle of the foregoing. X oc. 4, obj. F. 

 Fig. 6. Anterior hook, x oc. 4, obj. D. 

 Fig. 7. Posterior hook, x oc. 4, obj. F. 

 Fig. 8. Posterior hook of Chone fauveli, St. Andrews (? marked variety 



of C. duneri). 

 Fig. 9. Posterior hook of typical Clione itifundibulifonnis, Kr., from 



Greenland. X oc. 4, obj. D. 

 Fig. 10. Posterior hook of Clione reayi, sp. n. X oc. 4, obj. F. 

 Fig. 11. Anterior hook o{ Fuc/wne lawrencii, sp. n. ? x 500 diam. 

 Fig. 12. Posterior hook, x oOO diam. 

 Fig. 13. Longer winged bristle of Sctiella nordenskioldi, sp. n. X 450 



diam. 

 Fig. 14. Spatulate bristle. X 450 diam. 

 Fig. 15. Anterior hook of the same. X 450 diam. 



Plate TIL 



Figs. 1, 2. Minnte cuspidate bristles accompanying the anterior hooks of 

 Sahella southerni. X oc. 4, obj. D, with draw-tube. 



* I am indebted to the Carnegie Trust for the majority of these 

 figures. 



5* 



