256 ORDER FLAGELLATA-PANTOSTOMATA. 



species from the rectum of the American toad, Bufo americanus. The Monas 

 intcstinalis of Dujardin, discovered among the excrement of Triton palmipes, is 

 apparently also synonymous with this type. 



Bo do ranarum, Ehr. 



Body colourless, transparent, subovate, about twice as long as broad, 

 pointed at each extremity, but more so posteriorly; caudal filament shorter 

 than the body. Length 1-1440". 



HAB. Intestinal mucus of various frogs and toads. 



The habitat of this species being identical with the preceding, suggests the 

 possibility of its being merely a transitional condition of it. Its specific distinc- 

 tion is at the same time recognized by Perty, Schmarda, and Diesing. 



Bodo hominis, Davaine sp. 



Body pyriform, anterior flagellum much longer than the body ; caudal 

 filament rigid, nearly equalling it in length. Length 1-2500". 



HAB. The human intestine, found associated wit: f he foecal evacuations 

 of cholera patients and in typhoidal affections ; in the latter instance the 

 animalcules are usually of smaller size ; occasionally also abundantly in 

 the gelatinous excreta of infants. 



This type is identical with the Cercomonas hominis of Davaine referred to in 

 Leuckart's ' Menschlichen Parasiten,' Bd. i. p. 143, 1863. 



Bodo helicis, Leidy sp. PL. XIV. FIGS. 12 AND 13. 



Body exceedingly plastic and changeable in form, elongate-ellipsoid, 

 fusiform, or ovate ; caudal filament equal to or exceeding the body in length ; 

 anterior flagellum short; parenchyma colourless, finely granular, enclosing 

 an anterior and posterior vesicula, representing probably the imperfectly 

 observed endoplast and contractile vesicle. Length 1-1500" to 1-1200". 



HAB. Copulatory tubes of various land-snails, Helicidce. 



This species was originally described under the generic title of Cryptobia and 

 Cryptoicus by Professor Leidy, but has since been referred to Ehrenberg's genus 

 Bodo by Diesing. Among the numerous examples represented in the woodcut 

 accompanying Professor Leidy's original description, several of the animalcules, as 

 shown at Fig. 13, exhibit lateral protuberances with enclosed particles, which have 

 apparently been engulphed laterally in the same manner that food-substances are 

 ingested by the genera Oikomonas, Spiimdla, and other Pantostomata. 



Bodo julidis, Leidy. PL. XIV. FIGS. 1-3. 



Body changeable in form, globose, oval, or pyriform ; caudal filament 

 twice the length of the body, capable of active movements and frequently 

 twisted at its extremity in a loop-like manner ; parenchyma translucent 

 greenish, slightly granular, enclosing one or two large spherical vacuoles, 

 and numerous minute ones. Diameter 1-3000". 



HAB. The large intestine of Julus marginatus. 



