Bacillaria.] THE INFUSORIA. 231 



spots, the seminal glands of Ehrenberg, are seen. The 

 self-division is longitudinal and ventral, the parts dividing 

 themselves before the restoration of the original form, 

 which, in some specimens, is never restored, the portions 

 remaining like bows, or semi-lunar-shaped pieces. After 

 division both the halves gape, and take an apparently 

 oblique position in regard to the stalk ; those bodies which 

 are separated from their stalks have a free movement. 



329. COCCONEMA Boeckii. Boeck's Cocconema has a 

 large lanceolate lorica, acute at the extremities, striated, 

 and attached to a branched pedicle. Ehrenberg states he 

 has not seen a central opening, but that there is a ventral 

 one near each end. Found in sea- water. Striae twenty-six 

 to 1-lOOth of a line. Length l-430th to l-210th. 



330. COCCONEMA lanceolatum. Lorica semi-lanceolate, 

 striated ; ends obtuse, attached to a branched pedicle, in 

 which they differ from Eunotia turgida (260), and also in 

 the presence of a central opening in the lorica, as shewn 

 in group 195. The first figure is a dorsal, the other a 

 lateral view; 194 is a remorse group, moderately mag- 

 nified. Found in fresh water. Length 1-2 10th to 

 l-120th. 



331. COCCONEMA cistula. The casket Cocconema. 

 Lorica small, semi-ovate, striated ; pedicle branched, cen- 

 tral openings distinct, terminal ones obscure. Free spe- 

 cimens resemble Eunotia faba (264) ; the young are semi- 

 luniform. Figures 196, 197, and 198, represent three 

 specimens of this species. Found, living, on aquatic 

 plants, and fossil at Cassel, Santi Fiora, and Jastraba, in 

 Hungary. Length l-430th to 1-1 150th. 



332. COCCONEMA cymbiforme (Frustulia, Kiitzing). The 



