108 Wisconsin Academy of Sciences , Arts, and Letters. 
noted several apparently new forms, or, at least, variations from 
types hitherto described. 
I am indebted to Dr. D. B. Ward of Poughkeepsie, 1ST. Y., 
for the following list of species or forms recognized by him 
and for the micro-photographs from which the illustrations have 
been made. 
List of Species Recognized.—Actinocyclus Ralfsii, var. Arir 
zonae; Amphiprora pulchra (fragments) ; Amphora coffaefor- 
mis, var. protracta (Pant. II, 5 ) \ A. lineata; A. proteus (abun¬ 
dant) ; Denticula tenuis ; also, var. Mesolepta (Grun.) ; Epithe- 
mia gibba;* also, var. ventricosa ;* E. gihberula ;* E. incisal 
(Pant.) ; E. turgida;* Fragilaria virescens; Frustulia ( navic - 
ula) interposita; Gomphonem.a suhclavatum ;* ILantzschia am- 
phioxys, var. vivax; Ilaynaldella (antiqua), var. Arizonae; 
Ilyalodiscus scoticus; Mastogloia Braunii; M. elliptica, var. 
(A. 8. At., 185, 8) ; M. lanceolate; M. Smiihii; Melosira Bor- 
rerii; M. nummuloides; Navicida Bohemica;* N. divergens (f. 
minor A. S. ; N. elliptica; N. interrupted; N. formosa; N. limr 
osa ;* N. Macraeana (Pant.) ; N. peregrina; N. Sculpta ;* 
Nitzchia vitrea; Af. sp. ?, (ILantzschia f) Stouroneis aspera 
(very narrow var.) ; Surirella striatula. 
Dr. Ward writes: 
“I enclose a list of the forms as I identify them. The actino¬ 
cyclus which I formerly called A. Ralfsii v. Monicae is not ex¬ 
actly that form, but pretty close to it. It might be called A. 
Ralfsii v. Arizonae. 
“The Haynaldella differs slightly from Pantoesek’s original 
in having heavier markings and wanting a clear space in the 
center. I have never seen this form in American material be¬ 
fore. The small Mastogloia is found also in Utah fossil ma¬ 
terial, and is figured in Schmidt’s atlas (PI. 185-8) as a variety 
of M. elliptica —which I doubt. 
“There is a Nitzschia, or ILantzschia, which I cannot 
identify. 
* ■*.*#.'**’■** 
“You will find a good deal of variation in the Actinocyclus; 
but I believe it is all one species, as intermediate forms occur. 
This deposit is marine, although it contains a, few fresh-water 
forms, which I have noted in the list by an asterisk.” 
