COCHLIOPODIUM. 29 



the narrower pole and a variable number of spines diverg- 

 ing from the opposite pole and sides ; in the lateral view 

 it is cap-shaped like Difflugia constricta, but more de- 

 pressed ; base rests on a level at its anterior two-thirds, 

 and is inverted as in ArceUa. The spines range from 

 one to nine, or they may be absent (var. ecornis}. Length, 

 Sfyeto 26/*; breadth, 72/z to 220// ; height, 36// to 80/*; 

 mouth, 28// to 100/* ; length of spines, 20/* to 60/z. 



Hob. Common with Arcella vulgaris, among floating 

 confervas, or adherent to aquatic plants. 



GENUS XIII. COCHLIOPODIUM. 



SYN. : Amoeba, Auerbach ; Amp hi zone lla, Archer ; Cochliopodium, 

 H. and L. 



Animal minute, provided with a flexible, chitinoid 

 shell, thinning away to the broadly expansive mouth, and 

 exhibiting a minutely cancellated structure. Sarcode 

 intimately adherent to every part of the interior of the 

 shell, pale, granular, mingled with variable proportions 

 of highly refractive corpuscles, often crystals and other 

 elements, together with a large central nucleus, and one 

 or more contractile vesicles. Pseudopods delicate, hya- 

 line, conical, pointed, sometimes forked. 



bilimbosum, SYN. : Amceba bilimbosum, ac- 

 tinphora, Auerbach ; Amceba zonalis, Leidy ; Cochliopodium pellucidum, 

 H. and L., Schulze. 



Body when at rest spheroid or ovoid ; by transmitted 

 light, viewed from above, appearing usually as a trans- 

 lucent, granular, protoplasmic mass, with coarser, darkly 

 outlined granules, closely invested by a transparent, color- 



