209 



any other genus. A somewhat similar form occurs in the fossil 

 deposit at Ananino, Russia. 

 Cestodisciis ovalis, Grev. 



For the recording of this species we are indebted to Dr. D. 

 B. Ward, of Poughkeepsie. 



ChcEtoceros {didymiis, Ehr?) (Plate XCIL, Fig. 6). 

 Cyclotella opercidata, Kiitz. 

 Discoplea physoplea, Ehr. 

 Epithemia gibba (Ehr.), Kiitz. Rare. 



EUNOTIA Americana, Kain and Schultze, n. sp. 



Valve arcuate ; dorsal ridge convex and constricted into 

 broadly rounded ends. Striation exceptionally fine. (Plate 



XCIIL, Fig. I). - . 



EtipodiscHS radiatus, Bailey, var. antiqua, J. D. Cox. 



While this species bears a general resemblance to Eupodiscus 

 radiatus, the cellules are not radiate nor of equal size, but are 

 much smaller towards the mar<jin. General Cox has noted the 

 same form in the Richmond deposits, and instead of considerin 

 It a distinct species, he prefers to consider it merely a variety. 





Hemiaiihis affi 



I serpentina, Ehr. var. (Plate XCII, Figs. 5 and 5a). 

 Hyalodiscus Icsvzs, Ehr. 

 Liradiscus niinutits^ Grev. 



We are indebted to Dr. Ward for a beautiful photograph of 

 this species found in the deposit 



Navicula De Wittiana, Kain and Schultze, n. sp. 



Valve broadly lanceolate; median hne stout; strias costate, 

 convergent at the middle oi the valve and radiate towards the 

 apices; intermediate free space broad. (Plate XCIIL, Fig. 5). 

 Navicula Lewisiana, Grev. 

 Navicula Lyra, Ehr. 



The type form and several varieties are frequent 

 Navicula {Pinnularici) macilenta, Ehr. 

 Plagiogramma Gregorianum, Grev, 

 Rhaphoneis gcmmifcra, Ehr. 

 Sceptroneis gemmata, Grun. 

 Sltctodiscus Kitlonianus, Grev. 

 Terpsinoe intermedia, Grun. var. (Plate XCIIL, Figs. 2 and 2a), 



Rare. 



