70 KANSAS ACADEMY OF SCIENCE. 
Surirella suevica. Synedra superba. 
Synedra crotonensis. Synedra ulna, var. longissima. 
Synedra danica. Synedra ulna, var. vitrea. 
Synedra familiaris. Total genera, 21; species, 108. 
Synedra pulchella. 
Many more might undoubtedly be discovered by devoting time to the more 
thorough examination of the slides, as I never sit down to them without finding 
something new. As sixty species is a fair average for the best gatherings, it will 
be seen that this at Gage’s pond was unusually good. 
A gathering made at Silver Lake, twelve miles west of Topeka, yielded much 
the same forms, except that in a half-inch mount of it only two Hpithemia gibba 
were observed, and with the following additions: 
Achnanthes hudsonis. Navicula confervacea, var. peregrina, 
Achnanthes exilis. Gritin. (fig. 17, pl. IIT). 
Achnanthes lanceolatum. Navicula lanceolatum. 
Cocconema cistula (a new variety). Navicula spherophorum. 
Cyclotella comta. Nitzschia dissipata. 
Cyclotella meneghiniana. Nitzschia hungarica. 
Cymatopleura apiculata. Nitzschia paradoxa. 
Enocyonema triangulum. Nitzschia sigmoidea. 
Fragellaria turgens. Nitzschia tryblionella, forma minor. 
Gomphonema affine, forma major. Nitzschia tryblionella, forma densus 
Gomphonema gracile. striate. 
Melosira crenulata. Nitzschia tryblionella, var. victoriz. 
Melosira varians. Pleurosigma eximium. 
Navicula ambigua. Pleurosigma hippocampus (?). 
Navicula ampliata. Pleurosigma delicatulum. 
Surirella intermedia. 
One additional genus, Cyc/otel/a, and twenty-nine species. 
DIATOMACE OF RENO COUNTY, KANSAS. 
( Read before the Academy, at Topeka, December 28, 1900.) 
Mr. S. G. Mead made a gathering last fall at Medora, Reno county, which he 
said he did not clean up well and he wished me to try it. On account of much 
flocculent matter, which seems to be a silicate which the diatoms grow in, also 
much fine sand of the same specific gravity as the diatoms, as well as the vast 
difference in the size and weight of the latter, some being among the largest and 
some among the smallest forms known, it was the most difficult material to deal 
with, by either subsidence or flowing, that I have ever met with; and the diffi- 
culties were much increased by there being so little of it to work upon—only a 
thin skin of black mud, about half a thimbleful, at the bottom of a tumbler. 
I however succeded in getting four or five fair slides, which conclusively 
proved it to be a very rich material, and that the forms of the western part of the 
state, as compared with the eastern, such as those of Gage’s pond and Silver 
Lake, were unexpectedly large and interesting. 
It had for some time been an opinion of mine, formed from a number of gath- 
erings made around Salina and McPherson, that the central and western parts of 
the state were decidedly poor, if not altogether deficient in large forms of any 
kind. Still, about the first thing seen after placing the Medora slides under the 
microscope was one of the very largest Nitzschia, long, and a little curved, per- 
haps spectabilis, or new (?), (see fig. 14, pl. II) and large enough to be easily re- 
