650 RADIATA. 



ORDER I. ASCIDIARIA. 



Animals disunited, either isolated or placed in groups, without any inter- 

 nal communicatioQ ; and not connected in a common mass. 



ORDER II. BOTRYLLARIA. 



Agglomerated animals, always united, arid combined in a common mass. 



CLASS XII.-ENTOZOA. 



Body soft, naked, and elongated ; destitute of a distinct head, eyes, or 

 feet ; mouth formed of one or many suckers ; no tentacula or organs of 

 respiration ; intestinal canal scarcely perceptible in some species. 



ORDER I. ELMINTHOGAMA. 



Worms which usually live on the exterior of aquatic animals, or in the 

 interior parts of others, with a mouth and a vent, and the sexual organs 

 separate ; nervous filaments in some, emerging from near the opening of 

 the osophagns. 



Filiaria rnedinensis. — The Guinea Worm. Plate Ixxxv. fig. 8. De- 

 scribed, vol. iv. page 409. 



Humularia sub-compressa. — The Sub-compressed Humularia. Plate 

 Ixxxv. fig. 9. Fig. 10. head of do. magnified. Oblong, round, compressed 

 on both sides ; dark-brown, and studded with black spots, taperirig towards 

 the anterior extremity ; head obtuse, and furnished with two hooks. 

 Found in the human body. 



Trichocepkalus dispar. — The Long Thread Worm. Plate Ixxxv. fig. 13. 

 male. Plate Ixxxvi. fig. 1. female. Anterior part small and capillary, 

 terminating in an acute point, in which the mouth is situated ; the posterior 

 part swells out to a considerable size, and in the male is spiral and pro. 

 vided with a funnel-shaped tube. Inhabits the human body. 



Oxyurus vermicularis. — The Maw or Thread Worm. Plate Ixxxv. fig. 4. 

 nwle, natural size; fig. 3. magnified; fig. 2. female, natural size; fig. 1. 

 magnified. Head obtuse, and the body gradually thickening towards the 

 tail ; the female is subul.ite towards the tail. Inhabits the human body. 



Oxyrus angulata. — The Angulated Maw- Worm. Plate Ixxxv. fig. 6. 

 Male ; fig. 5. the female ; both the size of nature. Head obtuse, body thick, 

 tapering from about the middle to the tail ; pale horn-colour. Inhabits the 

 buman body. 



Ascaris lumhricoidet. — The Long Round Worm. Plate Ixxxv. fig. 7. 

 Male. Cylindrical tapering to the two extremities, and annulated ; flesh- 

 coloured. From 10 to 15 inches long. Inhabits the human body. 



Strongylus gigas. — The Great Strongylus. Plate Ixxxv. fig. 12. Natural 

 size, 11 magnified. Head obtuse tapering towards both extremities; body 

 composed of annular rings. Inhabits the human body. Strongylus found 

 in human urine, Plate Ixxxv. 11 and 15. 



ORDER II. — ElMINTHAPROCTA. 



Worms whieli inhabit the interior of the bodies of other animals ; with 



