AMOEBOID PROTOZOA (SARCODINA) 



231 



131 (132) Spines lateral Euglypha brachiata Lcidy 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 

 <i::^3;SJ^Xlt;?Qf=r^ prolongations of some of the lateral plates. Habitat among 



\V^^^^^-«-<.i23>^ sphagnum. Length 104 to 128^- 



^»^ Fig. 336. Euglypha brachiata. X i8o. (After Leidy ) 



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



Euglypha alveolata 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. .\ common species in the 

 f^^^r^i^T^ 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 90 M. 



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



135 (134) Plates bordering aperture lobed. Euglypha compressa Carter 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 /i. 



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



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



Placocista Lcidy. 



Representative species Placocista spinosa Lcidy 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 n. 



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



137 (120) Aperture not terminal 138 



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



Plates rounded Trinema Dujardin . . 130 



139 (140) Oral extremity broad. 



Trinema camplanatiim Penard 1800. 



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

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

 30 to 40 n. 



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



140 (139) Oral extremity narrow 141 



