BIOLOGY. 69 
Cymatopleura elliptica. 
Cymatopleura solea (both long and 
short). 
Cymbella gastroides. 
Cymbella stomatophora. 
Cymbella turgidula. 
Denticula elegans. 
Denticula tenuis. 
Denticula thermailis. 
Diatoma tenue. 
Encyonema lunula. 
Encyonema turgidum. 
Epithemia gibba. 
Epithemia gibba, var. ventricosum. 
Epithemia sorex, short form. 
Eunotia gracilis. 
Eunotia lunaris. 
Eunotia lunula. 
Fragellaria intermedia. 
Fragellaria mutabilis. 
Gomphonema abbreviatum. 
Gomphonema affine. 
Gomphonema affinis. 
Gomphonema angustatum. 
Gomphonema angustatum, var. inter- 
media. 
Gomphonema angustatum, var. pro- 
ducta, Grtin. 
Gomphonema commutatum. 
Gomphonema constrictum. 
Gomphonema gracile, forma parva. 
Gomphonema lagenula Kg. 
Gomphonema mexicanum Griin. 
Gomphonema obtusatum. 
Gomphonema olivaceum. 
Gomphonema parvulum. 
Gomphonema parvulum, var. subcapi- 
tata. 
Melosira lyrata, var. (?). 
Meridion circulare. 
Navicula acrospheria, var. (?). 
Navicula arenaria Donk. 
Navicula bacilliformis. 
Navicula biceps Ehr. 
Navicula brebissoni. 
Navicula cuspidata. 
Navicula decurrens (Pinn.) 
Navicula divergens, forma minor. 
Navicula elliptica, var. oblongella (fig. 
24, pl. IIL). 
Navicula flanatica. 
Navicula gibba ( Pinn.) 
Navicula hemiptera. 
Navicula interrupta. 
Navicula lanceolata. 
Navicula lanceolata, var. much smaller. 
Navicula mesolepta. 
Navicula nodosa, var. 
Navicula (No. 15, Schmidt’s Atlas, pl. 
44), 
Navicula (No. 44, Schmidt’s Atlas, pl. 
45). 
Navicula (No. 45, Schmidt’s Atlas, pl. 
44), 
Navicula (No. 55, Schmidt’s Atlas, pl. 
7, with some reserve). 
Navicula oculata. 
Navicula oblonga. 
Navicula peregrina. 
Navicula producta. 
Navicula pseudobacillum. 
Navicula radians. 
Navicula radiosa. 
Navicula radiosa, var. acuta. 
Navicula retusa. 
Navicula rhyncocephala. 
Navicula rostellata. 
Navicula (small, elliptical, coarsely 
marked, fig. 10, pl. II). 
Navicula schumanniana. 
Navicula stauroneiformis. 
Navicula stauroptera. 
Navicula stomatophora Grtin. 
Navicula subinflata (fig. 23, pl. III). 
Navicula tabellaria Grtin. 
Navicula trinodis. 
Navicula ventricosa, forma minuta. 
Navicula viridis ( Pinn.) 
Navicula viridula Kg., forma minor. 
Nitzschia frustulum. 
Nitzschia sigma. 
Nitzschia (small, 
markings). 
Pleurosigma spencerii. 
Stauroneis anceps. 
Stauroneis phoenicenteron. 
Stauroneis (unknown, small). 
Surirella apiculata. 
Surirella molleriana. 
Surirella ovata. 
Surirella ovata, var. 
Surirella panduriformis. 
unknown, coarse 
