248 iEOLIDID^. 



series on each side of the back ; foot narrow, anterior angles round- 

 ed. Spawn kidney-shaped. Tongue a single plate with a stout 

 central spine and delicate marginal tentacles. 



^olis despecta. 



Plate XVI. Figs. 222-22.5, 



Animal colorless, with a zigzag olive-colored stripe along the back ; branchiae 

 large, ovate, in a single series along each side ; dorsal tentacles long ; angles of 

 foot not produced. 



Eolis dtspecta, Johnst. in Mag. Nat. Hist. viii. .378, fig. 35 e; Ann. Nat. Hist. i. 123. — 

 Alder and Hancock, Nudib. Moll. Fam. III. pi. 36. 



Animal slender, tapering gradually backwards to a point, faintly 

 greenish ; on the back is a conspicuous olive-colored stripe which 

 passes from side to side alternately to the bases of the papillas ; now 

 and then the stripe passes from one pa])illa to another on the same 

 side. Dorsal tentacles long, simple, rather Ijlunt, stretching for- 

 wards, dotted along the lower two thirds and having an orange ring 

 at that point; a roseate hue at their dorsal junction. Oral tentacles 

 quite short, linear, pellucid. Branchial papillge large, with a slen- 

 der pedicle, and much dilated near tip, which is clear and transpar- 

 ent, in some aspects seeming as if encircled by a white ring ; the 

 central portion is filled with the granular hepatic substance of an 

 olive-green, communicating with the zigzag vessel on the back ; 

 there are about four to seven on each side, alternating with each 

 other. Foot narrow, anterior angles rounded. Length, about one 

 fourth of an inch ; breadth, one twentieth of an inch. 



Found in a timber dock, Charles River, September, 1842 ; at South 

 Boston, July ; on the piles of Warren Bridge, low tide, among Cam- 

 panularia, June and July (^Stimpsoti) ; Gloucester (^Mrs. Smith} ; 

 Scotland (Ju/t nstoii) . 



This minute little species is easily recognized by the dark zigzag 

 vessel along the back, communicating first this side and then the 

 other with the interior of the branchial papillae. Tliese are large, 

 attached by a small pedicle, scattered along each side in a single 

 range. Their colors vary slightly, being more or less pale. The 

 ova are deposited in a small kidney-shaped mass upon zoiiphytes. 

 The lingual ribbon is composed of a single series of trefoil pieces 

 having a median hoolvcd point and about six lateral denticles. 



