214 DESCRIPTION OF {Polyyastrica. 



striae in 1 -100th of a line. In the Uving state the striae 

 are seen with difficulty, but easily when the lorica is 

 empty. Found, living, among oscillatoria ; fossil at Santa 

 Fiora. Length 1-1 840th to l-570th. 



263. EuNOTiA granulata. The granulated Eunotia has 

 only been observed in a fossil state ; it is striated, and has 

 a semi-lanceolate elongated lorica, granulated upon the 

 surface, as seen at fig. 165. Striae five in 1- 100th of a 

 line. (Franzensbad.) Length l-240th to l-140th. 



264. Eunotia y«Z»«. The beam-like Eunotia is striated, 

 and has a semi-oval-shaped lorica, of the form of a beam. 

 Nine striae in 1-lOOth of a line. Found fossil in Sweden. 

 Length 1-1 150th to l-570th. 



265. Eunotia arcus. The bow- shaped Eunotia is 

 striated, and has its lorica constricted, near the ends, in 

 the form of a bow. Eleven striae in 1 -100th of a line. 

 Found fossil in Sweden. Length 1 -480th to 1 -280th. 



266. Eunotia diodon. The bidentated Eunotia is 

 striated, plane on the ventral side, and obtusely biden- 

 tated at the middle of the back. Found fossil in Sweden, 

 &c. Length 1-5 70th. 



This species and the five following closely resemble 

 each other, the only difference being in the number of 

 undulations or dentations on the dorsal surface, and the 

 name is derived from the prominences or dentations thus 

 produced; they are all fossil. Group 164 represents a 

 side and under view of E. triodon. 



267. Eunotia triodon, three dentations. Length 1-5 70th. 

 (Sweden.) 



268. Eunotia tetraodon.ioux dentations. Length l-570th. 

 (Finland.) 



