APLYSIDAE 285 



G. pacificu77i Bergh from the Aleutians is similar, but yellowish with red 

 flecks. There are i6 to 20 gill leaflets. Margin of mantle without a flagel- 

 lum, as in rubrum. Uncommon from 9 to 15 fathoms. G. cmereum Dall 

 (British Columbia) is 1 1 mm. in length, and a uniform dusky-slate color. It 

 also lacks a posterior flagellum on the mantle. 



Superfamily APLYSIACEA 



Faviily APLYSIIDAE 

 Genus Aplysia Linne 1767 



Dorsal lobes free, well-separated and used for swimming. Shell internal, 

 thin, flat, horny, with little or no lime, and colored amber. Skin smoothish. 

 They give off a harmless purple ink, Tethys is a name which was for a long 

 time applied to this group, but it is now restricted to a nudibranch genus. 

 Aplysia is a conserved name (see fig. 6og). 



Aplysia willcoxi Heilprin Willcox's Sea-hare 



Cape Cod to both sides of Florida. 



5 to 9 inches in length. Mantle under the lobes with a minute perfora- 

 tion or fleshy tube above the area of the shell. Color dark-brown with slight 

 maculations on the swimming lobes, head and neck. There are large, rounded, 

 fairly regular, yellowish scallopings along the inner border of the lobes. 

 Mantle and gills light-purple and yellow. Common. The form perviridis 

 Pilsbry is clear green on the head and tentacles, the lobes olive-green with a 

 coarse-meshed reticulation of black, subdivided by fine veins; irregularly 

 maculated all over with light-green, with an occasional clumping of white 

 dots. 



Aplysia dactylomela Rang Spotted Sea-hare 



South half of Florida and the West Indies. 



4 to 5 inches in length, characterized by its pale-yellow to yellowish- 

 green color and the fairly large, usually irregular circles of violet-black scat- 

 tered over the body. Common in some grassy localities. A. protea Rang of 

 the West Indies is very similar, but the circles are more numerous, and often 

 with smaller circles or large spots within the larger ones. 



Aplysia fioridensis Pilsbry Sooty Sea-hare 



Lower Florida Keys. The West Indies? 



4 inches in length. Color deep purple-black, the inside of the swimming 



