218 Dr. Wallicli on the Amoebae. 



in the movements of the animal the endosarc appears to flow 

 within walls, more or less thick, formed by the ectosarc. With 

 the exhaustion of the endosarc from behind, the including 

 ectosarc contracts and melts away into the advancing portion 

 of the body."— (9^. cit. p. 38. 



" In the taking of food he " (Dr. Wallich) " supposes that 

 each portion when swallowed becomes enveloped with a film 

 of ectosarc, which forms a vesicle enclosing the food and 

 water-drop in the interior of the endosarc. As the food under- 

 goes digestion, and the water, altered in condition, is imbibed 

 from the vacuoles into the contiguous endosarc, the vesicles of 

 ectosarc which contained the food and water undergo resolu- 

 tion into endosarc." — Op. cit. pp. 43-4. 



" Amceba villosa. Amoeba, Wallich, Ann. & Mag. Nat. 

 Hist. 1863, vol. xi. pi. viii. p. 287. Amoeba villosa, Wallich, 

 ibid. p. 366, pi. ix. p. 434, pi. x. figs. 5-9. Duncan, Pop. 

 Sci. Rev. 1877, p. 217, pi. vi. figs. 38-40. 



" Size, to sirth of an inch (Wallich). 



"Amceba villosa, a large and remarkable species, described 

 by Dr. Wallich, was discovered by him in England." — Oj7. 

 cit. p. 63. 



" Dr. Wallich's remarks concerning the movements of 

 Amoeba villosa apply equally to those of the form under con- 

 sideration " (meaning Pelomyxa villosa, Leidy). " He 

 says that ' the rush of granules of the sarcode does 

 not follow upon a previous contractile efibrt exercised at the 

 posterior portion. As the animal progresses, occasionally 

 altering its course, there are periods during which perfect 

 quiescence is maintained by the granules ; and the rush or 

 flow of these seems to take place, as it were, to fill up the 

 vacuum engendered by the sudden projection of a portion of 

 the ectosarc." — Ann. & Mag. Nat. Hist. 1863, xi. p. 369 ; op. 

 cit. p. 75. 



^' Dr. Wallich describes a conspicuous nucleus and an 

 equally conspicuous contractile vesicle as present in Amoeba 

 villosa, having the same essential characters and holding the 

 same habitual positions as in Amoeba proteus. In the figures 

 accompanying Dr. Wallich's memoir the single large nucleus 

 and the large contractile vesicle, or, in its place, several smaller 

 ones, are the most striking features of the creature." — Op. cit. 

 p. 80. 



Peof. Maetin Duncan (" Studies among the Am(sbce "). 

 — " All that has been noticed in these studies will be found 

 somewhere or other, and I found it most interesting and in- 

 structive to study the work of Dr. Wallich in the Ann. & 

 Mag. Nat. Hist, for 1863. There tlie hairy Amoeba is 



