42 eolididjE. 



10. E. gra'cilis, Alder and Hancock. 



E. gracilis, A. & H. in Ann. N. H. xiii. p. 166 ; Brit. Nud. Moll. fam. 3, 

 pi. 18. 



Body slender, white : dorsal tentacles long, linear, white : 

 oral tentacles slightly longer than the dorsal pair : head rather 

 long : branchial processes elliptic-oolong, orange, with a narrow 

 ring of opaque white at the apex : foot with the anterior 

 angles produced and arched. L. 0*5. 



Habitat : Within tide- marks ; rather rare. "Whitley, Cul- 

 lercoats, and Newbiggin, Northumberland (A. & H.) ; Menai 

 Straits (Alder). [Cumbrae, KB. (Robertson).] 



11. E. smarag'dina, Alder and Hancock. 



E. smaragdina, A. & H. Brit. Nud. Moll. fam. 3, pi. 17. 



Body slender, white : dorsal and oral tentacles long, of 

 nearly equal length, white : head short : branchial processes 

 elliptic-oblong, green, with white tips ; set in 5 clusters : foot 

 with the anterior angles produced. L. 0-5. 



Habitat: Among seaweeds; very rare. Whitley, Nor- 

 thumberland (Hancock) ; Burghead (Murray). [W. Sweden 

 (Loven).] 



This species bears great resemblance to the last, from which 

 it differs principally in the colour of the branchial processes 

 and in the length of the head. 



*■&' 



12. E. pellu'cida, Alder and Hancock. 



E. peUucida, A. & H. in Ann. N. H. 1st ser. xii. p. 234 ; Brit. Nud. Moll, 

 fam. 3, pi. 19. 



Body slender, white, pellucid : dorsal and oral tentacles 

 long, equal in length, white : branchial processes nearly linear, 

 scarlet, with white tips ; set in 5 or 6 clusters : foot having its 

 anterior angles much produced. L. 0*8. 



Habitat: On a Tubularia from the fishing-boats, Culler- 

 coats (Hancock) ; Ilfracombe (Broderick). [Shetland (Nor- 

 man).] 



