i26 WORMS. MOLLUSCA. 49. Medufa. 
€aravellas Body ovate, with very long centraltentacula beneath, and 
a crenulate veil above, 
Mull, Befch. Naturf. 2. p. 150: tab.9, figs 2. 
Sloan Famaic. Y. p. 7. tab, 4, S. 
Inhabits the Atlantic, and inflames the hand by its touch. 
Body thin, fmooth, fhining, blueifh; hyaline, and tapering cach 
lide: cref ot veil running the whole length of the back, femi- 
lunaf, compreffed, furrowed with branched grooves, and marke 
with rofy veins: stentacula jointed, blue, fragile, and inter- 
mixed with fhorter tubercles. 
Üsbela. Tentacula of the difk naked, of the margin glandular: 
margin membranaceous, crenate, 
Mull. Befch. Naturf, 2. tab. 295. tad. 9. fige 2, 3« 
Inhabits the Meziterraunean and Jndian (cas. 
Body rigid, deprefied, with radiate grooves above; beneath with - 
a clavate trunk in the middle, furrounded with fhort clavate 
tubes : tentacula jointed, with 3 rows of glands. 
Dimorpba. Back eminent: beneath a minute crofs furrounded with « 
apertures: margin ciliate. 
Q. Fabr.fn. Grant. p. 365. n. 359. 
Inhabits North Seas; lefs than M. equoreas 
Body when expanded orbicular, with a fquare inflected margin; 
beneath concave : back divided into 4 parts by radiate grooves, 
with an elevated central crofs and white fibres, 
Catpanus  Difk gibbous; the border wide and ciliate: beneath a hairy 
la. crofs, 
Inhabits Greenland Sea, O, Fabr. fn. Graal. p. 366. 2. 360, 
Body conic-orbicular, beneath hollow and {nowy : fringe of the | 
margin and crois yellow, the latter often white, 
Digitaea, Hyaline, with a piftil beneath in the centre: margin 
. Ciliate. 
O.. Fabr. fn. Gran. p. 566, n. 361. 
Inhabits the Greenland Seas, and leaps with its margin bent in, 
Body very minute, conic, ftriate: fringe yellow or white, and 
hooked within: gifi/ ending in a yellow or white pencil. 
Frondofa, Margin of the difk varied with white opake fpots and dots : 
tentacula 8, dichotomous, befet with white pedunculate 
warts terminating in tufts. 
Pail. Spicil. Zool. 10. p. 29. tab. 2, fige 1—3. 
Inhabits the drchrepelago; {mall. 
Body 
