228 DESCRIPTION OF [Polygaslrica. 



upon live water plants, especially in spring. Length of 

 wand 1-1 150th to l-860th. 



3l7 GOMPHONEMA acuminatum. The pointed Gompho- 

 nema is striated, and has elongated wedge-shaped corpus- 

 cles. The head-like anterior portion of the lorica ter- 

 minates in a sharp crest or point; within the body, 

 numerous digestive cells are visible. Found living and 

 fossil. Length 1 - 860th ; sometimes from 1-1 720th to 

 1 -430th. 



318. GoMPUO*XEMAminutissimum(Grevil\e). The curved 

 Gomphonema is smooth (?) wedge-shaped, and curved ; 

 club-shaped laterally. Length, without stalk, I -860th; 

 seldom 1 -430th : cluster l-72nd. 



319. GOMPHONEMA clavatum. The club-shaped Gom- 

 phonema is smooth, short, and cuneiform. Found living 

 and fossil. Length 1- 720th : cluster 1-1 20th 



320. GOMPHONEMA rotundatum. The rounded Gompho- 

 nema is smooth (?) short and obovate laterally. Found 

 upon the roots of lemna. Length of body 1 -240th. 



321. GOMPHONEMA discolor. The colourless Gompho- 

 nema is smooth (?) slightly excised at the truncated end. 

 Length l-600th. 



322. GOMPHONEMA (?) olivaceum. The olive-brown 

 Gomphonema is smooth (?) oval on the lateral surface, and 

 having dense crystalline short pedicles, and forming a 

 gelatinous -like mass. Found upon Potamogeton. Length 

 1- 2300th. 



Genus LXIX. ECHINELLA. The palm Animalcules 

 are Bacillaria with simple siliceous lorica, attached to a 

 pedicle. The body is longer than it is broad, wedge- 

 shaped, and developed, by longitudinal self-division, in 



