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.) 



56(55) Without pores through the fundus. . Hyalosphenia cuneaia Stein 18 S7- 



Shell exceedingly transparent and greatly compressed, 

 Pseudopodia few in number, often but one. Habitat 

 is reported to be clear water. A rare species. Length 

 from 60 to 75 m- 



Fig. 299. Hyalosphenia cuneaia. Broad and narrow lateral 

 views, n, nucleus. X 3Cra. (After Leidy.) 



57 (52) Shell chitinous, more or less densely covered with foreign particles 



or formed elements 58 



58 (75) Shell primarily of foreign particles 59 



