854 DESCBIPTIOK OF {^Polygastnca- 



elliptic, and apices, though prominent, are rather obtuse. Length 

 l-960th. 



Epithemta Musctdiis. — Dorsum elevated, apices somewhat acute, 

 strias convergent, ten to eleven in l-1200th; primary sides broadly 

 elliptic, subrotund, apices slightly prominent. Length 1 -420th. 

 Brackish water in the Baltic (P. 16, f. 18.) 



E. Westermanni = Eunotia Westermanni (Ehr.) — On secondary side 

 dorsum convex, apices gradually tapering, rather obtuse, not pro- 

 minent striae scarcely convergent in the centi'al portion, seven to eight 

 in l-1200th; on primary side elliptic. Length l-360th. 



E. Zebra = Eunotia Zebra (Ehr.) — Dorsum convex, apices very 

 obtuse ; transverse striae of the centre convergent, five to seven in 

 l-1200th ; primary side oblong. Length l-360th. 



£. Zelrina = Eunotia Zebrina (Ehr.) 



E. turgida = Eunotia turgida (Ehr.) 



E. Porcellus. — Large ; on secondary side, dorsum convex ; apices 

 truncate, reflected ; transverse striaj convergent, eleven in l-1200th ; 

 primary side linear, seven times longer than broad. Length 1 -240th 

 to l-216th. Eossil at San Eiore (P. 16, f. 12.) 



E. Alpestris. — Secondary side arcuate, narrow; apices rounded, 

 verj' slightly recurved ; transverse striae four to five in l-1200tli; 

 primaiy side unequal. Length two to three times greater than width. 

 (l-600th to l-324th. P. 16, f. 8.) Spring water, Tliun, Switzerland. 



E. ocellata = Eunotia ocellata (Ehr.) 



E. Argus = Eunotia argus (Ehi-.) 



E. gihberula = Eunotia gibber ula (Ehr.) 



E. Textricula = Eunotia Textricula (Ehr.) 



E. Saxonica. — Small, on secondary side dorsum convex, under side 

 concave, conti-acting gradually towards the ends, which are slightly 

 obtuse, rounded but not recurved ; transverse striae subconvergent, 

 six to seven in 1 -1 200th ; primary side oblong, rectangular. Length 

 1 -840th. Saxony and Italy. 



E. proboscidea. — Small ; on secondary side dorsum expanded, 

 rather concave below ; apices constricted, obtuse, remarkably re- 

 curved; transverse striae convergent, five to six in 1-1 200th ; primary 

 side oblong, rectangular, with obtuse angles. Length 1 -540th. Eossil, 

 Luncbf'""" 



