AMOEBOID PROTOZOA (SARCODINA) 



231 



(132) Spines lateral . Euglypha hrachiata Leidy 1878. 



This species may be known by the straight shell, elongate 

 and cylindrical. Plates oval, imbricating in a regular manner. 

 From four to six large, long spines are developed, representing 

 prolongations of some of the lateral plates. Habitat among 

 sphagnum. Length 104 to 128 /i. 



Fig. 336. Euglypha hrachiata. X 180. (After Leidy ) 



132 (131) Spines usually absent, scattered when present. 



Euglypha aheolata Dujardin 1841. 



Shell ovoid, elongated, very slightly compressed if any. Plates 

 round or oval, imbricating, presenting a regular hexagonal design. 

 Nucleus large, spherical; contractile vacuoles two in number. 

 Pseudopodia numerous, long and straight. A common species in the 

 ooze of ponds, among algae and mosses. Length 45 to 100 n. 

 Fig. 337. Euglypha alveolata. X 375. (Original, from a prepared mount.) 



133 (126) Aperture oval 134 



134 (135) Plates bordering aperture denticulate. 



Euglypha ciliata Ehrenberg 1848. 

 Shell compressed, elongate-oval. Plates oval or round, imbricated. 

 Needle-like spines are produced from the entire surface or in a line 

 around the lateral border of the shell. Habitat sphagnum. Length 

 40 to go n. 



Fig. 338. Euglypha ciliata, X 250. (After Penard.) 



13s (134) Plates bordering aperture lobed. Euglypha compressa Caxttt 1864. 



Shell greatly compressed, formed of elliptical plates, imbricating 

 and presenting a hexagonal design. Numerous spines, fusiform in 

 shape, are produced from the lateral border of the shell. Habitat 

 sphagnum. Length 70 to 132 ju. 



Fig. 339. Euglypha compressa. X 225. (After Leidy.) 



136 (121) Margin of aperture not dentate. Shell oval, compressed. 



Placocista Leidy. 

 Representative species. . . . Placocista spinosa Leidy 1874. 



This species may be known by the long, awl-shaped spines 

 which are movably articulated in a line about the lateral border 

 of the shell. Plates oval, imbricating in a regular manner. Habi- 

 tat sphagnum. Length 100 to 136 11. 



Fig. 340. Placocista spinosa, X 170. (After Leidy.) 



137 (120) Aperture not terminal 138 



138 (143) Shell elongate-oval, usually compressed; aperture subterminal. 



Plates rounded Trinema Dujardin . . 139 



139 (140) Oral extremity broad. . . Trinema camplanatum Penard 1890. 



This species is short and broad, the anterior end usually as broad 

 as the posterior extremity. Aperture oval. Habitat mosses. Length 

 30 to 40 ^. 



Fig. 341. Trinema camplanatum, X 500. (After Penard.) 



140 (139) Oral extremity narrow 141 



