114 Illinois State Laboratory of Natural History. 



The chlorogon layer becomes finally thick and extensive, 

 deeply imbedding the alimentary canal and the dorsal vessel, 

 and extending out upon the branches of the latter as far as the 

 body wall. 



In the alimentary canal of the specimens examined were 

 numerous slender, fusiform, monocystid Gregarinida? (Pl.VIIL, 

 Fig. 14), average examples being about .34 mm. long by ,02 

 mm. wide, tapering towards both ends, the anterior extremity 

 with an apparent open pore or sucker by means of which it was 

 commonly adherent to an epithelial cell. In one such case the 

 protoplasmic contents of such a cell were drawn out, by the 

 slight withdrawal of the gregarinid, into a short, thick, striated 

 thread. Each has a large, circular, highly granular nucleus, 

 commonly near the center. In some cases these Gregarinida3 

 were in masses of half a dozen. 



In the coelom are numerous encysted parasites (PI. VIII., 

 Fig. 15), usually thick-walled, with a central protoplasmic mass 

 (varying from spherical to crescentic), within which is a spher- 

 ical, conspicuous, highly granular nucleus, often containing a 

 nucleolus also. These bodies are commonly attached to the 

 inner surface of the longitudinal muscle layer, but are occa- 

 sionally imbedded in the fatty bodies or lie free in the cwlom. 



BIBLIOGRAPHY. 



HOFFMEISTER, W. Beitriige zur Kenntniss deutcher Land- 

 anneliden. — Wiegmann's Archiv f iir Naturgeschichte, 

 1843, Hd. 1., i)p. 183-198. 



Die bis jetz bekannten Arten aus der Familie der 



]?egen\vurmer. Hraunschweig, 1845. 



SCHLOTTHAUBER, Dr. Beitriige /ur Heiminthologie. 

 ("Anitl. Her. fiber 31 Versammlung deutscher Natur- 

 forscher und Art/e zu Gottingen, Sept. 1854. Gottin- 

 gen, ISOn, pp, 122-124.") [A'ejdovsky.] 



