42 EOLIDID^. 



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 paii' : Jieacl rather 

 long : hranchial processes elliptic-oblong, 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. AVhitley, Cul- 

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

 Straits (Alder). [Cumbrae, N.B. (Robertson).] 



11. E. smarag'dixa^ 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. pellucida, A. & II. in Ann. N. H. 1st ser. xii. p. 234 ; Brit. Nud. Moll, 

 fam. 3, pi. 10. 



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 Tubidaria from the fishing-boats. Culler- 

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

 man).] 



