208 Bulletin, Vanderbilt Marine Museum, Vol. IV 



Color: In life this sea-hare is dull yellowish green, marbled with 

 pale brownish and with white spots, the margin is pale bluish with 

 white flecks, the undersurface is olive-green. It swims with an in- 

 describable, shimmering, fluid gracefulness. 



Technical description: The "Ara" specimen is 110 mm. long, in 

 its dead, constricted condition. The body is globose-ovate, broadly 

 rounded posteriorly. The tentacles are very large, elongated, distally 

 much expanded, the broad, thin edges undulated. The rhinophores 

 are decidedly shorter and much smaller than the tentacles, very mus- 

 cular, with the ends dilated. The mantle lobe is nearly semicircular, 

 with a small open sinus at each end of the branchial cavity. The 

 entire upper surface of the body and head is covered with rather 

 closely spaced, fleshy, conical papillae, 2 to 3 mm. high in the dead 

 specimen; some of these papillae are acute-tipped, but the majority 

 are divided distally into two, four or, more rarely, six small 

 branches. This ornamentation, combined with the color-pattern, gives 

 this species an excellent mimicry of seaweed. 



Shell: Well developed, calcareous, with the beak produced, some- 

 what spoon-shaped with concavity ; the sinus incurved with the inner 

 margin thickened; the outer margin nearly straight, with a faint 

 curvature; the anterior margin obliquely truncated. The outer sur- 

 face bears obscure radial ribs. 



There is definite need of more critical work on the anatomy of this 

 species than has been presented, but this must await the capture of 

 additional fresh specimens. 



Reference : Doldbrifera virens Verrill, Trans. Conn. Acad. Arts and 

 Sci., vol. XI, part I, p. 24, text fig. 1, 1901-03. 



HETEROPODA. 



Section: PTEROTRACHEATA. 



Family: CARINARIIDAE. 



Genus: OAEINAEIA Lamarck. 



Carinaria mediterranea Peron and Lesueur. 



Plate 132. 



Type : Not stated ; the writers refer to and figure this species, under 



