WORMS. 125 



like filaments, placed parallel with each othtir, 'and 

 frequently changing their position. 

 93. ENCHELIS. ttody invisible to the naked eye, quite 



simple, cylindrical. 



94 VOLVOX . Hotly invisible to the naked eye, quite sim- 

 ple, transparent, spherical. 



95. MONAS. Body invisible to the naked eye, most sim- 

 ple, transparent, resembling a point. 



ORDER I. INTESTINA. INTESTINE. 

 1. ASCARIvS. Ascarides. 



1. A vernticulans. Head subulate: skin at the sides of 



the body very finely crcnulate or wrinkled. 



Barbut's Warms, t. i.f..6*rMem. Lond. Med. Soc. v./>. 230. t. 2. 



In the human intestines. Body .a,hout half an inch long, a, little 

 dilated in the middle and wrinkled at the sides, pellucid and an- 

 gular : fund nodofe, divided- into '-three vefcicles, in the middle of 

 each of which there is an aperture or mouth : tail gradually taper- 

 ing to a point : vent below the middle. Female with a fitiall per- 

 foration a little below the head, through which the young are 

 protruded.. 



2. A. lumbricoides.. Head slightly incurved, with a trans- 



verse contraction beneath it: mouth triangular. 



Barbut's Worm j, t. i ../. 7. Mem. I.oiid..Mra. Sac. v.t. i. 



In the human intestines. < Jr 12-1/5 inches long, tranfparcnt, 

 light yellow with a faint line down the side, differing from the eartfh- 

 worm in wanting the fleshy ring below thie head, and in having 3 

 vesicles: head 3-lobed, with a triangular aperture between them: 

 trunk a little wrinkled, with a circular depression about the mid- 

 dle, in which is a small punctiform aperture: tail Tubulate : vent 

 large, below the middle of the body. 



3. A. Canis. Head flattened, winged each side with a 



membrane : spermatic vessels curled : tail pointed. 



In the intestines of the Dog. Kedi. Cfusc. 3. t. 17. /. 3. 



\. fftlis. Head with a greyish-while oblong vesicle 

 each side, which is obtuse and pellucid on the hind- 

 part. 



In the Cat. Rtdi axim. VKJ. in an. triv. t. 13 /. 8. 



4. A. Cati. Head without the -oblong vesicles eaeh side. 



In the intestines of the Cat. Goeze Einvtu,, p. 80. 



5. A. Equi. Body whitish, cylindrical, large, taper. 



In the Horfe. G&eze Eingew. p. 62. t. i,/. 1-3. 



Body often a foot and a half long, and as thick as a man's little 

 finger, fometimes marked with large brown patches. 



6. A. Carbonis In the crop of the Pelecanus Carbo. 



Tranfact. Linn. Society v.p. 14. 



Body yellowish-brown, coiled ap into a ball or mafs. 



T. A. Pelecanus. In the crop of the Pelecanus crUtatus. 



Refembks the last.. Trans, Linn. Soc. v. /. 24, 



S. A. marina. Body filiform, whitish, smooth, twisted 

 spirally and lying flat : intestine tubular. 



In marine ftsh. Br. Zati. iv, tab, 20. /. 3. Gordius, 



