74 KANSAS ACADEMY OF SCIENCE. 
found at Medora is as follows, so far as recognized; there is some doubt in the 
case of a few of them, indicated by an interrogation point (?): 
Achnanthes biasolettiana Grtin. 
Achnanthes exigua. 
Achnanthes hudsonis. 
Achnanthes lanceolata. 
Achnanthes minutissima Kg., forma 
curta. 
Achnanthes trinodis. 
Cocconema cymbiforme. 
Cymbella amphicephala. 
Cymbella anglica. 
Cymbella naviculiformis. 
Cymbella (No. 52 of Schmidt’s No. 9, 
not named). 
Cymbella pusilla of Grtinow. 
Denticula tenuis. 
Encyonema (large, like Schmidt’s At- 
las, pl. 71, fig. 18). 
Encyonema lunula. 
Encyonema (No. 61 of Schmidt’s At- 
las, pl. 10). 
Encyonema ventricosum. 
Epithemia gibba. 
Epithemia gibba, var. ventricosum. 
Epithemia gibberula. 
Fragellaria elliptica, forma minor. 
Fragellaria intermedia. 
Fragellaria mutabilis. 
Gomphonema affine. 
Gomphonema angustatum. 
Gomphonema auritum A. Braun. 
Gomphonema clavatum. 
Gomphonema insigne. 
Gomphonema lagenula. 
Gomphonema monatum, var. subcla- 
vatum. 
Gomphonema sarcophagum. 
Meridion circulare. 
Navicula acrospheria. 
Navicula affinis. 
Navicula alternans. 
Navicula amphirhynchus Ebr. 
Navicula ampliata. 
Navicula arenaria Donk. 
Navicula bacillum. 
Navicula bacillum, forma minor. 
Navicula bicapitata Lag., var. hybrida 
(fied, pls ED). 
Navicula borealis, (type form). 
Navicula borealis, var. (No. 16 of 
Schmidt's Atlas, fig. 45.) 
Navicula borealis, var. 
more coarsely marked). 
Navicula brebissoni. 
Navicula columnaris. 
Navicula commutata. 
Navicula confervacea Kg., var. hun- 
garica (fig. 5, pl. II). 
Navicula conspicua. 
Navicula cryptocephala. 
Navicula cuspidata. 
Navicula dicephala W. S. 
Navicula dicephala W. S., forma 
minor, Griin. 
Navicula dilatata. 
Navicula dirhynchus. 
Navicula dubia Greg. 
Navicula elliptica. 
Navicula elliptica, var. minuta Griin. 
(fig. 4, pl. II). 
Navicula firma Kg. 
Navicula firma, var. subampliata. 
Navicula fontinalis Grtin. 
Navicula gibba ( Pinn.) 
Navicula inflata. 
Navicula interrupta (Pinn.) 
Navicula lanceolata Kg. 
Navicula leptogongyla Kg. 
Navicula linearis. 
Navicula macra, var. ? (fig. 8, pl. II). 
Navicula major ( Pinn.), ex re Grtin. 
Navicula mesostyla (Pinn.) Ehr. 
Navicula nobilis Ehr., var. (No. 3 of 
Schmidt’s Atlas, pl. 43). 
Navicula (No. 22 of Sch., pl. 49, not 
named). 
Navicula (No. 40 of Sch., pl. 49, not 
named). 
Navicula (No. 44 of Sch., pl. 44, not 
named). 
Navicula ( No. 47 of Sch., pl. 50, not 
named). 
Navicula (No. 75 of Sch., pl. 45, not 
named ). 
Navicula obtusata W. S. 
Navicula producta W. S. 
Navicula pseudobacillum. 
Navicula pupula (?). 
Navicula rhynchocephala. 
Navicula rupestris ( Pinn.) Hautsch. 
Navicula stauroparva. 
(larger and 
