THE INTESTINAL PROTOZOA OF FROGS AND TOADS. 231 
tinguished from his other genus Monocercomonas (Tri- 
chomonas of others) by the one character ‘a coda bifida.” 
He divided the genus Dicercomonas into two sub-genera, 
Monomorphusand Dimorphus, of which the definition is, 
to say the least, scanty. Monomorphus is distinguished 
as “si presenta sotto una sol forma.” ‘The only species is 
Dicercomonas (Monomorphus) ranarum, with “ Hexa- 
mita ranarum, Duj.”! 
given as a synonym. The name 
Dimorphus was given to D. muris, and subsequently 
eliminated as Megastoma entericum (Grassi, 1881). 
Saville Kent, 1880, re-described Hexamita intestinalis 
Duj. from his own observations. His account is in many ways 
inaccurate, and he persists in the statement that there are six 
flagella: “The exact number, character, and point of inser- 
tion may be readily substantiated . . . ” I feel convinced 
that he really saw the 8-flagellate organism. He enume- 
rates further both Ehrenberg’s Bodo forms, but made no 
observations himself upon them. He suggests, however, 
that Monas intestinalis Dujardin is a synonym for Bodo 
intestinalis. This appears to me highly improbable. 
Grassi re-described the organism under consideration in 
1882. He was unable to determine the number of flagella, 
and apparently relinquished the name Monomorphus. For 
he adheres to the name Dicercomonas intestinalis Duj., 
giving Hexamita intestinalis Duj. as only synonym. 
In the same year Kunstler (1882) described—though very 
briefly—a flagellated organism from tadpoles, which appears 
to me to have been probably our 8-flagellate organism. 
The flagella were not accurately investigated. Kunstler, in 
spite of his insufficient observations, introduced the new 
name Giardia agilis for this animal. 
Biitschhi, 1884, retains the genus Hexamitus? (Duj. emend. 
Biit.). 
‘ A mistake for Hexamita intestinalis Duj. 
* Giving Chetomonas Ehrbg. and Heteromita pusilla Perty 
as possible synonyms for Hexamitus. Neither of these appears to me 
to have anything to do with the form under consideration. 
VOL. 53, PART 2.—NEW SERIES. V7 
