WORMS. MOLLUSCA. 22. Onchidium. 23. Laplifia. 74 
Found early in the {pring in hollows of woods, filled with dry 
leaves: 10 lines long: shield whitifh with a yellowifh caft. 
* Lanceola- Linear-lanceolate and very fharp at each end ;. the margin 
tut, : furrounded with a membranaceous border: tentacula 
or feelers o. | 
Pall. Spicil. Zool. 10, p+ 19; tab. 1, fig, 11. 
Found on the coaft of Cornwall: of a very uncertain Genus, 
22. ONCHIDIUM. Body oblong, creeping, 
flat beneath; mouth placed betoré : fect- 
ers 2, fituate above the mouth: arms 2, 
at the fides of the head: vent behind, 
and placed beneath. 
Typbe.. ONCH-4 4| 
Tranfa&. Linn, Soc. v. p. 132, tib. 5, fig. 1—3. 
Inhabits Bexga/, on the leaves of the Typha elephantina: about 
an inch long and i of an inch broad, but linear and longer 
when creeping. In appearance it very much refembles a Li- 
max, but differs principally in wanting the fhield and lateral 
pore, and in being furnifhed with a vent behind. 
Body above convex, aíh-colour, and covered with irregular g'an- 
dular tubercles; beneath flat and fmooth: ead yellowifh, 
{mall and placed beneath, which when the animal is in mo- 
tion is perpetually changing its form and fize, and drawn 
in when at reft: mouth placed lengthwaysand continually va- 
rying its fhape from circular to linear: feelers retractile, ree 
fembling thofe of the Slug, and apparently tipt with eyes : 
arms dilatable, folid, compreffed and fomewhat palmate when 
fully expanded. 
25. LAPLISIA. Body creeping, covered with 
reflected membranes, with a membrana- 
ceous fhield on the back covering the 
lungs: aperture placed on the right fide: 
vent above the extremity of the back: 
Jeelers 4, refembling ears. Sea-Aare. 
*Depilans. Body pale lead-colour, immaculate. 
Pennant Brit. Zool. iv. tad. 21, fig. 21. 
Barbut's Genera of Worms, p, 32, tab. 3, fig» 5, 6. 
Seba Muf. 3. tab, t, fig. 8, 9. 
K2 Inhabits 
