6 
WORMS. 
i6. 
Girdius. 
, Body equal filiform round and fmooth: 
20. 
Hirudo. 
Body truncate at each extremity ; head and 1 
tail dilated when in motion. 
b; 
Perforated with a lateral Pore. 
17-. 
Ltmbricus, 
Body round annulate, furnifhed with minute 
concealed prickles. 
?9* 
Stpunculus, 
Body round: mouth cylindrical and narrower 
than the head. 
Planaria. 
Body deprelied, with a ventral pore; 
IL 
MOLLUSC A. Simple animals furniihed with limbs. 
A. Mouth placed above. 
3?' 
Adl'inla. 
Body fixed, with a fingle terminal dilatable 
aperture furrounded by temacula of cirri. 
34-- 
Clava. 
Body fixed, with a fingle dilatable vertical | 
aperture ftirrounJed withclavate tentacula. ’ 
37* 
PediceUaria, 
Body fixed and furniihed with a riuid pe- 1 
dunde. ' 1 
36. 
Mammaria, 
Body loofe finootlt, with a fingle aperture j 
without cirri. | 
5^' 
Aj'cidia. 
Body fixed ; with 2 apertures, one of which 
is terminal, theolher placed alittle beneath* 
32- 
Salpa, 
Body loofe ; with 2 apertures, one at each 
end. 
33- 
Dagjfa. 
Body loofe angular, open at each end. 
B. Mouth placed before. 
39* 
Pterotrachea. 
Body pervious gelatinou.s, with a moveable 
fin at the head or tail. 
40. 
Dcrris. 
Body round tapering articulate: feelers 2, 
< 
C. Mouth placed before : body with a lateral perforation. 
21. 
Ltmax. 
Feelers 4: , vent common with the lateral 
pore. 
22. 
Laplyfia. 
Feelers 4: vent placed above the lower eX' 
tremity. 
24- 
Doris, 
Feelers 2 : vent above the lower extremities* 
Tethys. 
Body with 2 fmall pores on the left fide. 
D. 
Mouth before 
: body furrounded with feelers on the fore-part- 
4 1 ; UdotlmriS' 
I 
