GENUS BODO. 257 



According to Professor Leidy, this species occurs often in numbers which must 

 be estimated by millions, within the intestinal canal of the above-named Myriapod, 

 its companion in such rubitat being the ciliate animalcule Njdotherus velox. 



Bodo colubrorum, Hammerschmidt. 



Body hyaline, ovato-lanceolate ; anterior flagellum longer than the body, 

 the caudal filament of about equal length. Length 1-3450" to 1-2880". 

 HAB. Cloaca of the common snake, Tropidonotus natrix, 



Bodo lymnaei, Stiebel sp PL. XIV. FIGS. 9-11. 



Body hyaline, changeable in shape, more usually pyriform ; caudal 

 filament equalling the body in length, anterior flagellum scarcely as long. 

 Length 1-1200". HAB. Viscera of the pond-snail, Lymnaus stagnalis. 



Although first referred to the present genus by Diesing, this form was previously 

 described by Stiebel, Karsch, and Ecker as a species of Cercomonas, The pheno- 

 mena of encystment of this type have been recorded at some length by the last-named 

 authority.* On examining the dead and opaque eggs of the mollusc above named, 

 many of them were found to be densely packed with minute cysts having a diameter 

 of from 1-500" to 1-350" ; these bursting, gave birth to swarms of monadiform germs, 

 which speedily acquired the form and dimensions of the parent zooids. While thus 

 observing the development of the motile zooids from the indurated encystments, 

 Ecker does not appear to have witnessed the production of these cysts by the adult 

 animalcules. Taking into consideration the disparity in size between the motile 

 zooids and the cysts, there are, nevertheless, substantial grounds for anticipating 

 that these comparatively large sporocysts are produced through the coalescence of a 

 considerable number of monadiform units. Ecker' s representation of a character- 

 istic cyst with the liberated germs is reproduced at PI. XIV. Fig. ir. 



Bodo melolonthse, Leidy. 



Body spherical, caudal filament equal in length to the diameter of the 

 body. HAB. Intestine of the American cockchafers, Melolontha quercina 

 and M. brunnea. 



Bodo muscarum, Leidy. 



Body elongate, caudal filament four or five times longer than the body, 

 often enclosing a nucleus-like structure. Length 1-2160". 



HAB. Occurring in immense quantities within the intestine of the 

 common house-fly, Musca domestica. 



This species is probably identical with the Ctrcomonas musca-domestiea, as figured 

 by Stein, and here referred to the new genus Herpetomonas. 



Bodo maximus, Schmarda. PL. XIV. FIGS. 4-6. 



Body elongate-pyriform or clavate, rounded anteriorly, attenuate and 

 pointed posteriorly, from two to three or four times as long as broad ; caudal 



* A. Ecker, "Zur Entwicklungsgeschichte der Infusorien,'' ' Zeitschrift fur Wissenschaftliche 

 Zoologie,' Bd. Hi., 1851. 



S 



