. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. AOANTHOCYSTIS SPINIFEEA. 55 Diameter of envelope 40 ju, to 60 /x; length of spines from one third to one half the diameter of the envelope. Habitat.—Moorland pools and vegetation in still water. Distribtitiov. — England. — Sheffield district, W. Yorks.; Derbyshire (-BroiOTi). Iekland.—? Wicklow (Archer). In the original description of this species by Greeff the included yellow bodies were considered to be charactei-istic; they were also observed by Archer, but. Fia. 190.—Acanthocystis spinifera. x 300. (A
. The British freshwater Rhizopoda and Heliozoa. Rhizopoda; Heliozoa; Freshwater animals. AOANTHOCYSTIS SPINIFEEA. 55 Diameter of envelope 40 ju, to 60 /x; length of spines from one third to one half the diameter of the envelope. Habitat.—Moorland pools and vegetation in still water. Distribtitiov. — England. — Sheffield district, W. Yorks.; Derbyshire (-BroiOTi). Iekland.—? Wicklow (Archer). In the original description of this species by Greeff the included yellow bodies were considered to be charactei-istic; they were also observed by Archer, but. Fia. 190.—Acanthocystis spinifera. x 300. (After Greeff.) Hertwig and Lesser did not find them, their place being taken by numerous " chlorophyll-green granules"; Archer also observed these and remarked that they occurred in " never the abundant quantity mostly characteristic of A. ; The yellow globules Archer considered to be of an oily nature and agreed with Hertwig arid Lesser in the supposition that their presence or absence was probably determined by the " varying degree of nutrition of the ; I'his no doubt is correct if, as seems probable, they serve as a reserve supply of food. The A. spinifera of Penard is a distinct species, but Penard's illustration and description of " J. pertijana Archer " show that he had probably this species under observation at the 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 not perfectly resemble the original Cash, James, 1839-1909; Hopkinson, John, 1844-1919. joint author; Wailes, George Herbert, 1862-. London, Printed for the Ray Scociety
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