. Zoology : for students and general readers . Zoology. 32 tion is then carried on by the help of the lip alone, which expands latterly until it completely overlies the particle. All this is done quite rapidly, in a few sec- onds, and then the food glides quickly into the depths of the body, and is enveloped in a digestive Fig. (UveUa).-Mtor Tuttie. yaguole, whilst the lip as- sumes its usual conical shape and ; (Clark.) All the monads have a contractile vesicle. In 3Ionas termo, Clark observes that it is " so large and conspicuous that its globular f
. Zoology : for students and general readers . Zoology. 32 tion is then carried on by the help of the lip alone, which expands latterly until it completely overlies the particle. All this is done quite rapidly, in a few sec- onds, and then the food glides quickly into the depths of the body, and is enveloped in a digestive Fig. (UveUa).-Mtor Tuttie. yaguole, whilst the lip as- sumes its usual conical shape and ; (Clark.) All the monads have a contractile vesicle. In 3Ionas termo, Clark observes that it is " so large and conspicuous that its globular form may be readily seen, even through the greatest diameter of the body ; and con- tracts so vigorously and abruptly, at the rate of six times a minute, that there seems to be a quite sensible shock over that side of the body in which it is em- ; The contractile vesicle is thought to represent the heart of the higher animals. The reproductive organ may possibly be represented in Monas termo by a "very conspicuous, bright, highly refracting, colorless oil-like globule which is enclosed in a clear vesicle" called the nucleus. This and other monads live either free or attached by a slender stalk. As an example of the compound or aggre- gated monads may be cited Uvella, prob- ably glaucoma of Ehrenberg. Other forms, as Codosiga, are fixed by a stalk to some obiect (Fig. 21, C. pukherrimus „. „, , ^ ^ . Clark). In this and allied forms the body pvicherrimns. b, the , -. -. ,, , ,1. same begiumng to Qnder- is surmounted by a collar or calyx out of go fission, two new Ha- which the flagellum projects. The Co- noarly^eepSfindiVidii" dosiga has been observed by Clark to un- "i»--AJter ciark. dergo fission, two independent monads resulting, within the space of forty Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
Size: 2101px × 1190px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
