Untitled

222 ORDER RHIZO-FLAGELLATA.anteriorly situated ; endoplast spherical, subcentral ; endoplasm transparent,colourless. Length of body 1-2000".HAB. Pond water.Deprived of its terminal flagellum, this species would seem closely to agree bothin aspect and size with the Amoeba lacerata of Dujardin. Like that form, the pseudopodiaare altogether irregular in shape, and present a laciniate or ragged outline.The movements of this animalcule in the water are tolerably active, itcreepingrapidly forwards over the surface of submerged objects by the continual rolling to thefront of the granular contents of the body-sarcode in a manner identical with whatobtains among the ordinary amoebae the ; long, whip-like flagellum is at the same timevigorously flourished in advance or thrust around in every direction, as thoughseeking for suitable food-substances. These latter when met with, are whippedbackwards by the action of the flagellum, and striking against some portion of theperiphery of the body, are at once engulfed by the soft yielding sarcode. On oneoccasion an example was observed dragging a Navicula almost equalling itself in sizeby an abnormal thread-like extension of one of its pseudopodia, as shown in theillustration given. The Protozoon figured and described by Biitschli under the titleof " eine geisseltragender Rhizopode,"* isapparently almost identical with this form ;but the pseudopodia, in accordance with his illustrations, are smaller and moreslender, and the flagellum, in comparison, is considerably longer.Mastigamceba monociliata, Carter, sp. PL. I. FIGS. 22 AND 23.Body amoeboid, variable in form; pseudopodal extensions irregularlylobate, the posterior extremity having a brush-like villous tuft, anteriorflagellum equalling the body in length. Dimensions unrecorded.HAB. Fresh water. Bombay, H. J. C.This species is briefly described by Mr. H. J. Carter f as a new species ofAmoeba, upon which he proposes to confer the title of Amoeba monodliata. FromMastigamoeba simplex, which it most nearly resembles, it may be distinguished bythe tuft of villi at the posterior extremity.Mastigamoeba ramulosa, S. K. PL. I. FIGS. 19 AND 20.Body when extended elongate-ovate, about one and a half times as longas broad ;the entire peripheral surface bearing subequal shortly branchedpseudopodic prolongations, neither these nor the general surface of thjbody having secondary hispid pseudopodia ; flagellum exceeding the bodyin length ; endoplast spherical, subcentral ;contractile vesicle posteriorlylocated. Length 1-400".HAB. Marsh water.This animalcule has as yet been met with by the author on one occasiononly, being then found in marsh-water from the neighbourhood of Le Marais,Jersey, associated with the Ciliate types Spirostomum ambiguum and Litonotus fasriata.The conspicuously branched character of the abundant pseudopodia serves to distinguishit readily from either of the preceding species, and communicates to it asa whole an aspect suggestive of a minute Nudibranch, such as Eolis or Dendronotus.Like these molluscs, the little animalcule, under any disturbing influence,* 'Zeit. Wiss. Zool.,' Bd. xxx. Heft 2, 1878. f 'Ann. Nat, Hist.,' Jan. 1864.