N'avieulacea.l inffsorial animalcules. 357 



E0NOTIA Westermanni. = Epithemia Westermanni (Kiitz.) — Semi- 

 lanceolate, oval, with ten striae in l-1200th. It is of arichochre colour. 

 (In group 157.) Found witli the preceding. Length l-1150th. to 

 l-480th. 



E. Zebra. = Epithemia Zehra (Kiitz.) — Striated, semi-lanceolate, 

 oblong, with five transverse sti'iae in 1-1 200th. The strioe are seen 

 with difficulty except when the lorica is empty, or fossil. Length 

 1-1 840th. to l-570th. Found on fresh-water Algse, and fossil at 

 San Fiore, &c. 



E. granulata = Epithemia granulata (Kiitz.) — Striated, semi-lan- 

 ceolate ; elongate, slightly arcuate ; surface granular, beiug minutely 

 dotted iu the interspaces of the moniliform strige. Striae five in 

 1- 1200th. Length 1 -240th to 1-1 40th. Fossil in Germany, United 

 States. (P. 3. f. 165.) 



E. Faba = Epithemia Faba (Kiitz.) — Striated, semi-oval, Lq the 

 form of a bean j slightly arcuate ; apices obtuse, very little recurved, 

 StrisB moniliform (dotted), nine in l-1200th. Length 1-1 150th to 

 1 -570th. FossU. 



E. diodon. — Striated on the lateral surfaces, which are narrower 

 than the plane central surface ; apices obtuse, rounded and tapering ; 

 dorsum convex, obtusely bidentf^'e, with two obtuse ridges at its 

 centre. Length 1-5 70th. Fossil. 



E. triodon difiers from E. diodon, in having three dentations. 

 Length l-570th. Fossil. (P. 3. f. 164.) 



E. tetraodon. — Large ; dorsum very convex,and venter very concave; 

 constricted near each end, which is roimded ; dorsum with four large 

 rounded elevations; stria? strongly marked. Length 1-5 70th, 

 Living, Falaise ; fossil in Finland. 



E. pentodon, similar to E. diodon. — but dorsum with five ridges ; 

 ends attenuated, rounded. Fossil. 



E. Diadema. — Six dentations, ends rounded. Fossil. 



E. serr«.— Large, lunate, dorsum siuuose, with twelve to thirteen 

 indentations. Length 1 -280th. Fossil in Sweden and North America. 



E. gibba = Navicula gibba (Ehr.)_Striatcd, dilated at the middle, 

 and gibbous, oblong; ends dilated and rounded; striae nine ia l-1200th. 

 Length 1 -430th to 1-1 20th.- Living, Gravesend; fossQ, Isle of 

 France. (P. 15. f. 27.) 



