222 ORDER RHIZO-FLAGELLATA. 



anteriorly situated ; endoplast spherical, subcentral ; endoplasm trans- 

 parent, colourless. Length of body 1-2000". 

 Hab. — Pond water. 



Deprived of its terminal flagellum, this species would seem closely to agree both 

 in aspect and size with the Aviceha laceraia of Dujardin. Like that form, the pseudo- 

 podia are altogether irregular in shape, and present a laciniate or ragged out- 

 line. The movements of this animalcule in the water are tolerably active, it creeping 

 rapidly forwards over the surface of submerged objects by the continual rolling to the 

 front of the granular contents of" the body-sarcode in a manner identical with what 

 obtains among the ordinary amoebae ; the long, whip-like flagellum is at the same time 

 vigorously flourished in advance or thrust around in every direction, as though 

 seeking for suitable food-substances. These latter when met with, are whipped 

 backwards by the action of the flagellum, and striking against some portion of the 

 periphery of the body, are at once engulfed by the soft yielding sarcode. On one 

 occasion an example was observed dragging a Naviciila almost equalling itself in size 

 by an abnormal thread-like extension of one of its pseudopodia, as shown in the 

 illustration given. The Protozoon figured and described by Biitschli under the title 

 of " eine geisseltragender Rhizopode," * is apparently almost identical with this form ; 

 but the pseudopodia, in accordance with his illustrations, are smaller and more 

 slender, and the flagellum, in comparison, is considerably longer. 



Mastigamoeba monociliata, Carter, sp. Pl. I. Figs. 22 and 23. 



Body amoeboid, variable in form ; pseudopodal extensions irregularly 

 lobate, the posterior extremity having a brush-like villous tuft, anterior 

 flagellum 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 of 

 Aiiiceba, upon which he proposes to confer the title of Avuvba monociliata. From 

 Mastigaiiia'ba simplex, which it most nearly resembles, it may be distinguished by 

 the 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 long 

 as broad ; the entire peripheral surface bearing subequal shortly branched 

 pseudopodia prolongations, neither these nor the general surface of the 

 body having secondary hispid pseudopodia ; flagellum exceeding the body 

 in length ; endoplast spherical, subcentral ; contractile vesicle posteriorly 

 located. Length 1-400". 



Hab. — Marsh water. 



This animalcule has as yet been met with by the author on one occasion 

 only, being then found in marsh-water from the neighbourhood of Le INIarais, 

 Jersey, associated with the Ciliate types Spirosfoimim ambigiium and Liiojiotiis fasciata. 

 The conspicuously branched character of the abundant pseudopodia serves to dis- 

 tinguish it readily from either of the preceding species, and communicates to it as 

 a whole an aspect suggestive of a minute Nudibranch, such as Eolis or Dcndro- 

 iwtiis. Like these molluscs, the little animalcule, under any disturbing influence. 



'Zeit. Wiss. Zool.,' Bd. xxx. Heft 2, 1878. t 'Ann. Nat. Hist.,' Jan. 1S64. 



