Fam. 3, Plate 22. 



Figs. 1 to 4. 

 EOLIS GLAUCOIDES, Alder and Hancock. 



E. alba, depressa, capite parvo ; tentaculis parvis, simplicibus ; branchiis linearibus, albis, 

 apicibus fulvis, glandula centrali subfulva, in fasciculis pedunculatis 11 utrinque digestis ; pede lato, 

 angulis anterioribus acutis. 



Hab. Under stones at low water mark, Herm Island, near Guernsey, «/. A. 



Body about half an inch long, depressed, rather broad, transparent white, with opaque 

 white spots. Head small and narrow. Dorsal tentacles short, linear, simple, white with 

 opaque tips. Oral tentacles very short, and broadish at the base. BrancHce nearly linear, 

 tapering towards the top, transparent white, covered with minute opaque white spots ; the 

 central gland is narrow, linear, and of a pale fawn colour ; the apices yellowish, deepening 

 into fawn colour towards the tips. They are set in eleven clusters, of three or four papilla? 

 each, down the sides of the back, each cluster arising from a short foot-stalk; they commence 

 near the tentacles, and reach nearly to the tail, the posterior papillae extending a little 

 beyond it. A few of the papilla? nearest the back have a slight angle towards the base. 

 Foot broad, and rather thin at the edges, arched in front, and extending into acute angles at 

 the sides ; terminating behind in an obtuse rounded tail. It is transparent white, with a 

 darkish line down the centre from the gastro-hepatic vessel appearing through. A less 

 distinct, interrupted darkish line is visible down the centre of the back. 



This very curious Bolts shows, in most of its characters, an approach to the genus 

 Glaucus, particularly in the small size of the head and tentacles, and in the branchial papilla? 

 being arranged in clusters, arising from a short foot-stalk. Its anatomical characters bear 

 out this resemblance. A remarkably large and wide gastro-hepatic vessel occupies the 

 centre of the body, giving off branches on each side to the branchial pedicles. The ovary, 

 which, from the transparency of the skin, is visible outside, is divided into two lateral portions, 

 which pass down. the body, and are united posteriorly above the gastro-hepatic vessel. The 

 jaws are small and truncated behind ; and the tongue is very minute, long, and slender, 

 composed of a single series of plates, each bearing a single spine. 



When the genus Bolis, as we at present retain it, comes to be broken up, this species 

 will probably constitute a new generic type. 



Figs. 1, 2, 3. Eolis Glaucoides, different views. 



4. Branchial papillse more highly magnified. 



