Bacillaria.] THE INFUSORIA. 237 



two ova plates, two globular glands, and self-division, are 

 observed. In organization it approaches Cocconema. 



351. GLOCONEMA paradoxum (Glojonema, Ag.) The 

 wonderful Gloconema has a semi-ovate, curved, striated 

 lorica, inclosed in hyaline tubes, which are simple, or rarely 

 branched. Ehrenberg remarks, " I found this species very 

 abundantly amongst Mytilus polymorphus, upon Conferva 

 rivularis, and saw both simple and branched threads ; the 

 little bodies, or corpuscles, being seldom arranged in two 

 rows, but mostly in one. It is a very remarkable circum- 

 stance that I very often found two different sorts of these 

 Navicula-like bodies in the same tube ; one was a very 

 delicate and straight kind, evidently a Naunema ; the other 

 was the large curved kind. Even to the present moment, 

 I cannot explain this phenomenon, for both sorts were in 

 considerable quantities, and quite free, and therefore it 

 is difficult to suppose one a parasite." Size 1 -2300th to 

 l-860th. 



Genus LXXVII. SCHIZONEMA. The rayed little ship 

 Animalcules have a double envelope ; inner one siliceous, 

 Navicula-shaped ; the external gelatinous, resembling 

 Naunema, but the tubes are connected together in a 

 bundle-like manner, not branched, though they appear so 

 when spread out. 



352. SCHIZONEMA (?) Agardhi. Agardh's Schizonema. 

 Lorica very narrow, acute at both ends, placed in a single 

 series ; the enveloping tubes are filiform, and enlarged in 

 those places where the siliceous lorica are lodged, as seen 

 in fig. 208, which represents a bundle of these tubes 

 magnified 300 diameters. Found on Acus, in the North 

 Sea. Length of lorica 1-7 20th. 



