8o 



THE LOBOSA 



Lithamoeba, Lankester 1 (Fig. 13). Body discoid, pseudopodia lobular 

 and hernia-like. A distinct pellicle covering the body, which ruptures 

 for the protrusion of the pseudopodia. Freshwater. Maximum 125 /z. 



Dinamoeba, Leidy. Pseudopodia long, conical, and acute. Body 

 enveloped in a delicate hyaline jelly bristling with minute spicules. 

 Bogs of New Jersey. 60-160 /z. 



The following genera were described by Frenzel (8, 9) from fresh 

 water in the Argentine Republic : Chromattlla, Stylamoeba, Saltonella, 

 and Eikenia. 



Centrochlamys, Claparede and Lachmann. The body covered with a 

 thin, membranous, disc-shaped test through which the pseudopodia pro- 



Fio. 13. 



Lithamoeba discus, Lank. A, quiescent; B, throwing out pseudopodia. c.v, contractile 

 vacuole, overlying which the vacuolated protoplasm is seen ; cone, concretions insoluble in 

 dilute IIC1 and dilute KHO, but soluble in strong HC1 ; /, food particles ; n, nucleus. (After 

 Lankester.) 



trude. No definite pylome. A single nucleus and several contractile 

 vacuoles. Freshwater. 40-45 p. 



Amphizonella, Greeff. Probably closely related to Centrochlamys. The 

 body is usually invested by a supple membrane which, under some circum- 

 stances, is itself surrounded by a transparent mucilaginous envelope. 

 The pseudopodia are pushed through these membranes and withdrawn 

 again without leaving any definite aperture. It has not been deter- 

 mined whether the position on the test through which the pseudopodia 

 protrude is definitely fixed or varies. These two last-named genera 

 are undoubtedly closely allied to Corycia, Cochliopodium, and other 

 Thecamoebida. 



Hyalodiscus, Hertwig and Lesser. The ectoplasm usually very thick, 

 and sometimes exhibiting radiating lines. A creeping movement with- 

 out pseudopodia frequently occurs. One or more inconspicuous nuclei. 

 Freshwater. 40-60 /z. 



Trichosphaerium, Schneider. The structure and life- history of this 

 genus has been fully described by Schaudinn (26). The body is in- 

 vested by a gelatinous test perforated by many pores for the protrusion 



1 Lankester, Q. J. Micr. Set. xix., 1879, p. 484. 



