EOLis. 599 



ranged in nine or ten transverse rows of five papillop each ; 

 back bare. Foot linear. 



Littoral zone, Northumberland (A. and H,). 



21. E. NANA, Alder and Hancock. 



Ann. Nat. Hist. vol. ix. p, 36, and Monog. part 4, fam. 3, pi. 25. 



Body (four lines long) oblongo-ovate, rather depressed ; 

 obtuse behind, pale yellowish, with white head and tentacula. 

 Dorsal and oral tentacles smooth, the latter rather the 

 shorter. Head rounded and dilated at the sides, produced 

 in front. Branchiee subclavate, rose-coloured centrally, 

 tipped with white, arranged in eight to ten close transverse 

 rows of five to six in each. Back smooth. Foot obtusely 

 angled in front. 



In the littoral zone on the Northumberland coast (A . 

 and H.). 



22. E. oLivACEA, Alder and Hancock. 



Ann. Nat. Hist. vol. ix. p. 35, and Monog. part 1, fam. 3, pi. 26. 



Body (half an inch long) lanceolate, yellowish, speckled 

 with opake white. Dorsal tentacles, short, obtuse, approx- 

 imated, yellow speckled with white, and centrally banded 

 with red ; oral tentacles shorter ; both are smooth. Branchire 

 oblong, cylindrical, yellowish brown, with belts of granu- 

 lated olive spots, pale at their tips, ranged in six to eight 

 rows of three or four nearly equal papillae. Angles of foot 

 obtuse. 



Northumberland, Durham, and Frith of Clyde, in the 

 littoral zone (A. and H.). 



Mr. Alder has suggested to us that the Eolis follata 

 (Forbes and Goodsir) described in the British Association 

 in 1839, and found in Zetland, is probably the young of 



