. Fresh-water biology. Freshwater biology. AMOEBOID PROTOZOA (SARCODINA) 223 48 (47) Shell of rod-like plates. 49 (so) Plates slender, elongate. 49 , Lecquereusia spiralis Ehrenberg 1840. The neck in this species is prominent and turned sharply to one side. The siliceous plates are cemented very closely to- gether, forming the shell. Sand and diatoms may sometimes be incorporated with the plates. Pseudopodia few, long and large. Habitat sphagnous swamps. Length 125 to 140 ji. So (49) Plates thick, short. Fig. 295. Lecquereusia spiralis. X 125. (After Penard.) . Lecquereusia epistomium Penard 1
. Fresh-water biology. Freshwater biology. AMOEBOID PROTOZOA (SARCODINA) 223 48 (47) Shell of rod-like plates. 49 (so) Plates slender, elongate. 49 , Lecquereusia spiralis Ehrenberg 1840. The neck in this species is prominent and turned sharply to one side. The siliceous plates are cemented very closely to- gether, forming the shell. Sand and diatoms may sometimes be incorporated with the plates. Pseudopodia few, long and large. Habitat sphagnous swamps. Length 125 to 140 ji. So (49) Plates thick, short. Fig. 295. Lecquereusia spiralis. X 125. (After Penard.) . Lecquereusia epistomium Penard 1893. In this species the neck is very sharply distinguished from the rounded shell and very abruptly turned to one side. The shell is clear, without foreign particles attached. Habitat sphagnous swamps. Length 125 ji. Fig. 296. Lecquereusia epistomium. X 150. (After Penard.) 51 (46) Shell not spiral. 52 52 (s7) Shell chitinous, transparent, structureless, with no foreign particles or formed elements attached. Hyalosphenia Stein . 53 53 (54) Surface of shell with undulations. Hyalosphenia elegans Leidy iS'!4. The shell is flask-shaped, compressed, brownish in color, transparent. Two minute pores, opposite each other, are in the base of the neck. Protoplasm colorless. Nucleus single. Pseudopodia few. Common in sphagnous swamps. Length from 90 to 100 n. Fig. 297. Hyalosphenia elegans. X 250. (After Penard.) 54 (53) Surface of shell without undulations SS 55 (56) With pores through the fundus. Hyalosphenia papilio Leidy 1873. Shell ovoid or pyriform, compressed, yellowish in color. Slight variation in size, shape and constitution shown in this species. Pro- toplasm not filling the shell but attached to the inner surface by pro- toplasmic processes. Endoplasm always containing chlorophyl. Pseudopodia often numerous. From two to six small pores about the border of the fundus. Common in sphagnous swamps. Length from no to 140 ju. Fig. 298. Hyalosphenia papilio. X 200. (After Leidy.) 5
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
