273 
Gomphonema montanum subclavatum Grun. Fr. Neb. Rather 
common. W. 
Gomphonema parvulum (Kuetz.) Rabenh. -Fr.Neb. Not very 
common. M. T. 
Gomphonema Turris Ehr. Fr. Neb. Common. M. 
Gomphonema Vibrio Ehr. Fr. Foss. Rare. M. Common. G. 
Hantzschia Amphioxys (Ehr.) Grun. Fr. and subm. Neb. 
Common. W.M.. Var. mayor Grun. M1. 
Melosira distans (Ehr.) Kuetz. Fr. Foss. Neb. Very com- 
mon. M.L.G. W. 
Meridion circulare (Grev.) Ag. The specimens evidently 
belong to Meridion constrictum Ralfs, but that is probably only a 
form of MV. circulare. Fr. Foss. Neb. Rare. M. 
Navicula ambigua Ehr. Fr. Neb. The specimens are all in 
“resting” condition, described by Van Heurck (Syn. 100) as 
formacraticula. No specimens in normal condition were found: L. 
Navicula bacilliformis Grun. Fr. Neb. Rare. M. L. 
Navlicula cuspidata Kuetz. Fr. Neb. This species occurs 
both in normal and “ resting’ condition. Not very common. 
W. M. L. 
Navicula dicephala Ehr. Fr. Foss. Neb. Rare. M. 
Navicula elliptica Kuetz. Fr. and subm. Foss. Neb. Rather 
common. M. Mr. 
Navicula Gigas (Ehr.) Kuetz. Fr. Not common. M. 
Navicula Hungarica Grun. Fr.and subm. Rare. L. 
Navicula Iridis Ehr. Fr. Neb. Varieties affinis (Ehr.) V. 
H., amphigomphus (Ehr.) V. H., and amphirhynchus (Ehr.) De Toni 
Occur with the species. The specimens of the type are all rather 
Small.  W. M.-1. To Nee: amphigomphus is the only form that 
De Toni, |. c., cites as fossil. 2 
Navicula Legumen Ehr. Fr. Neb. Rare. M1. 
Navicula limosa Kuetz. Fr. Neb. The specimens vary from 
the type, being as long as 95 p, and scarcely inflated at the apices. 
Common. G. 
Navicula nobilis (Ehr.) Kuetz. Fr. Foss. Rather common. M. 
Navicnla oblonga Kuetz. Fr. Foss. Neb. Rather common. 
Navicula parva (Ehr.). Fr. Neb. Not very common. M. © 
