WORMS. kOLLUSCA. 39. Pterotrachea. 107 



89. PTEROTRACHEA. Body detached, 

 s-elatinous* with a moveable fin at the 

 abdomen or tail : eyes 2, placed within 

 the head. 



Gcmiata. Abdonlcn and tail furniihed with fins: head wkh a round 

 perpendicular probofcis, and a coronet of 10 fpines on 

 the front. 



Nat'. Mi/cell, tab. 328. Forfk. Arab. p. II 7. n-. 4 1.-' 



Inhabits the Mediterranean, and Archipelago. 



Ecdy fubcyliridricah about a fpan long and an inch in diameter i 

 bead rounded on the fore-part and furnifhed in front with a 

 cornet of 10 conic fpines : beneath the coronet is the pro- 

 bofcis, 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 : trunk near 

 the fin beneath (potted with white; abdomen rough beneath, 

 with an ovate pendulous pouch* before the fin : vent near the 

 ligament of the tail: /^'/vertical, an inch long, triangular, 

 with 4 prickly lines each fide, and terminated each fide by a 

 iemicordate horizontal pinnule :jfo? lituated beyond the middle 

 of the body, orbicular, compreffed. and fixed to the white 

 laminas of the trunk which are crenate each fide ; beneath in 

 the margin is another pinnule which is bell-fhaped, hyaline> 

 h I and affixed by a middle point. 



Hjalinc.i Head elongated^ projecting, fmooth : fin central. 



Inhabits -Fvrjk. fn. ALgypt. Arab p. ll8. ». 42. 



Body hardly an inch long and very quick in motion ; eyes brown, 

 at the bafe of the head : bead not crowned by fpines ; fin 

 roundim. 



Pulmnata. Head obtufe hyaline •» intefltne refpiratory and ciliate with 

 plumes 



Inhabits Forsk.fn* Arab. sEgypt. p. 118. n. 43. 



Body fubcylindrical, reddifh-hyaline j bead not diiUnct from the 

 trunk: eyes pellucid tranfverfe oval black: trunk with a few 

 \vhicifh dots beneath; fin roundifh longitudinal: intefiine 

 whitilh before and reddiin behind, fixed by a violet membrane 

 brown at the bafe; tail hyaline comiprefTed tapering. 



i&'Meata, Abdomen without fin: tail longer than the trunk, with 

 prickly lines and terminal horizontal fin. 

 Inhabits the Archipelago* ■ Forsk.fn. Arab, p, 118. n. 44, 



O 2 B 9 a% 



