168 DESCRIPTION OF [Polygastrica. 



the body, numerous, or each one cleft into several parts, 

 so as to give it the appearance of being many. The body 

 is enveloped in a pitcher-like lorica, sometimes globular, 

 and at others oblong or spiral in form. The lorica of this 

 genus being opaque, except that of D. enchelys, little of 

 the internal organization of these creatures is known ; in 

 the D. enchelys numerous digestive cells have been seen. 

 In the D. proteiformis and D. acuminata, the lorica is 

 covered with grains of sand, similar to that of the caddis- 

 worm. In D. oblonga and D. enchelys, the shell is 

 smooth. 



152. DIFFLUGIA proteiformis. The varying Difflugia. 

 Lorica ovate and subglobose, as represented in figs. 89, 90, 

 and 91 : it is roughly coated with minute grains of sand, 

 and is either of a blackish or greenish colour. The trans- 

 parent processes vary in number from one to ten. 

 In fig. 89, six are protruded. M. Le Clerc mentions 

 their having spiral corrugations on the lorica, which Ehren- 

 berg does not appear to have seen. Found among oscil- 

 latoria, &c. Size 1 -240th. 



153. DIFFLUGIA oblonga. The oblong Difflugia. Shell 

 oblong, with the back rounded, smooth, and of a brownish 

 colour. The transparent processes fewer and stouter than 

 those of the preceding species. Found among oscilla- 

 toria, &c. Length 1 -200th. 



154. DIFFLUGIA acuminata. The pointed Difflugia. 

 Shell oblong and rough, being covered with minute grains 

 of sand, posterior pointed ; processes transparent. Length 

 l-70th. 



155. DIFFLUGIA enchelys. The flask- shaped Difflugia. 

 Shell oval ; colourless ; transparent and smooth, rounded 



