WORMS. MOLLUSCA. 49. Medufa. ^27 



Sodv flattifli, a little convex above, the border membranaceous 

 and fringed with white fafciculi : beneath is a villous nucleus, 

 which in the leiTer ones is 8-angled, and in the larger ones 

 io-angled. 



°ietrafiyla. Hemifphaerical, without tentaeula ; furnifbed with 4 mar- 

 ginal tubes united into a prifm. 

 Forskfn. /Egypt. Arab. p. 1 06, ». 1 1 . 

 Inhabits the Red Sea ; about a fpan and a half acrofs. 

 Body hyaline, rather rigid : tubes of the margin linear, 3 inches 

 long, flraight and flat, 



Qilofala. Hemifphaerical, without marginal tentaeula : beneath a 

 4-folded column with 8 many-cleft lobes at the tip ; 

 and 16 lateral appendages. 



Inhabits the Red Sea. Forsk.fn. J5g. Arab. p. 106. «. 18. 



Body, blueifli-hyaline, a foot in diameter; the column beneath 

 about an inch and a half long. 



Andromeda Hemifphaerical, without marginal arms : beneath 8 round 

 ramified foliaceous arms. 

 Inhabits the Red Sea, Sbaiv Nat. Mt/cei tab. 259. 

 Body tranfparent, pale yellowifh-brown or blueifh, with white 

 rays and entire margin ; in the middle a fmall black crofs : 

 arms white, and a little thicker than a goofe quill at the in.- 

 " » fertion. 



Corona. Hemifphaerical, without marginal tentacular beneath $ 

 cultrate arms, toothed each fide below. 



Inhabits the Red Sea. Forsk.fn. JEg. Arab. p. 107. n. 20. 



Body reddifti-h valine, about 4 inches acrofs, with a blue crois in 

 the centre: arms beneath broad, and 2-lobed at the tip. 



t'trfea. Hemifphaerical, hyaline, with an opake white ring within 



4 times interrupted: marginal tentaeula o. 



Inhabits the Mediterranean. Forsk.fn. JEg* Arab. p. 1 07. n. 2,1, 



Body about 2 inches wide, with a very prominent margin : arms 



4, fublanceolate, about an inch long, and undulate at the 



margin. 



Cepbea, Hemifphaerical, tuberculate, reddifh-brown: beneath 8 

 arms villous at tlicir extremities, and 9 very long 

 filiform tentaeula. 



Inhabits the Red Sea. Shaiv Nat. MijceV, tab. 224. 



Body pellucid, with 8 paler rays: arms blkeifh with black ex- 

 tremities: tent acid a pointed. 



