122 WORMS. MOLLUSCA. 49. Medufa, 
Inhabits the Greenland Seas, and moves flowly by means of the 
fibres on the ribs: when touched contraéts itíelf into the 
form of an apple. ! 
Bed; white mixed with blue and covered with irregular red dots: 
apertures 2, terminal and meeting in the oblong middle cavity, 
Ovum,  Ovate, with 8 ciliate ribs and 2 pair of cirri, one pair of 
which is very long. 
O. Fabr. fn. Granl. 5. 362. n. 355. E iy 
Inhabits Greenland Seas, and refembles a hat; feldom larger 
than a Pigeon’s egg. 
Boay lucid and very fragile, the fragments while alive blue, 
B. Body {mecth, 
Perpita. Body above flat, beneath a little convex grooved and villous. 
Inhabits India. Aman, Acad. 4. p. 255. tab. 3. fige 7—9e 
* Cruciata. Body marked with a milk-white crofs, 
Inhabits European Seas. Barbut’s Worms. tab. 9. hg. 1. 
Body like a tranfparent colourlefs jelly, and furrounded at the 
margin with fine fibres: the cro/s marked with a brown fpot 
on each arm. Is very luminous when under fnn-fhine, 
Hyfacella, Body convex, with 16 rays, and 4 united tentacula beneath. 
Daft op. fubf. 2. p. 62. tab. 7. fig. 5? 
Inhabits the fea round Portugal. 
Body above whitifh, the rays compofed of extremely minute 
reddifh-brown dots: beneath concave: tentacula longer than 
‘the body, lanceolate and marked with reddifh ftriz, 
* Equorea, Flattifh, with a villous infleted tentaculate margin, 
Bahk. op. fubf. 2. p. §5. tab. 5, hg. 2, 3.7 
Inhabits the Ocean; extremely fimple foft and fringed at the 
margin with white, / 
* 4urita, Convex above, with an infle&ed fringed margin; beneath 
with 4 arched cavitics near the centre, 
Barbut, tab. g. fig. 2. It. Wath. 172. t. 5. f. 2. 
Baft, ép. fubf. 2. tab. V4. fg. 3+ 7, 82- pe 58—60, 
Merret pin. 9. 195. tab. 76, 77. : 
Found frequently floating on the furface of the fea; 2—4 inches 
diameter; when the íun fhines upon it, reflects a beautiful 
fplendor. 
* Capilista. Body convex with 16 indentations round the margin, and 
, * numerous [lender filaments beneath. 
Barbut. 
