22 Mr. H. J. .Carter on Freshwater Rhizopoda 



add to it here, except that certain bodies in the sarcode, which I 

 supposed to be larger starch-granules, now appear to me to have 

 been cells analogous to, if not homologous with, the " repro- 

 ductive " ones described in Amoeba princeps, which will presently 

 be seen to exist also in Z>. compressa, n. sp. 



The type form (perhaps) of the test of D. pyriformis, with its 

 varieties — together with delineations of the animal, its nucleus 

 in a spheruliferous condition, also in the effete state after the 

 spherules have passed into the body, and, finally, their develop- 

 ment in the watch-glass — will be found in PI. I. figs. 1, 2, 3, & 4, 

 illustrative of all that has been described in the paper to which 

 I have alluded. It should be remembered, however, that, if 

 (in fig. 1) the animal part had been shaded sufficiently deep to 

 represent its normal green colour, it would be nearly black. 

 Both the faint yellowish tint and the form of D. oblonga, Ehr. 

 (tab. 9. fig. 3), seem identical with the generative stage of D. 

 pyriformis that I have termed " colourless." 



Bifflugia compressa, n. sp. PI. I. figs. 5 & 6. 



Test lagenoid, compressed, circular posteriorly, elongated into 

 a short neck, with even aperture anteriorly *; composed of hya- 

 line grains of quartz-sand held together by a gelatinous (albu- 

 minous ?) substance ; presenting a dark, undulating, collar-like 

 mark at the junction of the neck with the body of the test. 

 Animal composed of diaphane and sarcode, the latter charged 

 with "moleculse," "granules," portions of undigested food, 

 starch- granules, yellow oil-globules, and small brown cells, which 

 latter appear to impart to it its characteristic light-brown colour. 

 Granules minute, colourless. Nucleus probably posterior, but 

 not seen in situ ; vesiculse or contracting vesicles also probably 

 posterior and marginal, as in D. pyriformis. 



Hah. Heath-bog water. Abundant among conjugating con- 

 fervoid Algse and Desmidiese. Progressing with the oral aper- 

 ture downwards and the test erect. Locomotion and capture of 

 food performed by obtuse digital prolongations of the body slowly 

 projected from the aperture. The " brown cells " do not enter 

 the pseudopodia. 



Size. Length -aJyth, greatest breadth of broad side iT-oth, 

 aperture 3-5-2-0^^ greatest breadth of narrow side -^-J^th, aperture 

 rth of an inch, 



Loc. England; south coast of Devon, Budleigh-Salterton. 



Observations. They werefound in abundance about the middle of 

 September, in company with conjugating confervoid Algse, &c., as 



* Of course, where the test is covered with grains of sand, the outer 

 margin of the aperture must be rough ; but where these grains are absent or 

 scanty, the inner one is found to be smooth and even. 



4 15" 



