WORMS. MOLLUSCA. 39. Pterotrachea. 107 
89. PTEROTRACHEA. Body detached, 
gelatinous, with a moveable fin at the 
abdomen or tail: eyes 2, placed within 
the head. 
Ccronata. Abdomen and tail furnifhed with fins: head wich a round 
“perpendicular probofcis, and a coronet of 1o {pines on 
the front. 
Nat. Miftell. tab. 328. Forfe. Arab. p. 117. m. 41. 
Inhabits the Mediterranean and Archipelago. 
Body fubcylindrica!, about a {pan long and an inch in diameter: 
bead rounded on the tore-part and furnifhed in front with a 
cornet of 1o conic fpines: beneath the coronet is the pro- 
bofcie, nearly 2 inches long, with a whitifh middle nerve, and 
thick hyaline tip and terminal mouth: eyes feated on each 
fide the back of the neck internally, and remote: srunk near 
the fin beneath {potted with white: addomen rough beneath, 
with am.ovate pendulous pouch before the fin: vent near the 
ligament of the tail: zai/ vertical, an inch long, triangular, 
with 4 prickly lines each fide, and terminated each fide by a 
lemicordate horizontal pinnule: fm fituated beyond the middle 
of the body, orbicular, comprefled, and fixed to the white 
laminz of the trunk which are crenate each fide ; beneath iid 
the margin is another pinnule which is bell-fhaped, hyaline, 
and affixed by a middle paint, V3 
Myalka,. Head elongated, proje&ing fmooth : fin central, 
| Inhabits——— Fer. fn. Egypt. Arad p. 118. n. 42. 
Body hardly an inch long and very quick in motion ; eyes brown, 
at the bafe ofthe head: ead not crowned by {pines: fis 
roundifh, 
Pulmoaatga, Head obtufe hyaline , inteftine refpiratory and ciliate with 
plumes 
Inhabits——— Forsh. fi. drab, ZEgypt. p. 118, a. 43. 
Body {ybcylindrical, reddith-hyaline: bead not diftin&t from the 
trunk: eyes pellucid traníverfe oval black: trunk with a few 
whitifh dots beneath; fiz roundifh longitudinal : intefline 
whitifh before and reddifh behind, fixed by a violet membrane 
brown at the bafe: ¢ai/ hyaline compreffed tapering, 
bist 
Aculeata, Abdomen without fin: tail longer than the trunk, with 
prickiy lines and terminal horizontal fin. 
‘ | Inhabits the Archipelago, | Forsk. fu. Arab. p, AA8. m. 44. 
O2 Bad, 
