20 Cincinnati Society of Natural History. 



Description of Plate I : 



Figure A. Lcpidocokiis ;a)/iesi^ showing the ridged row oj 

 plates and basal curvature. 



B. The same specimen, showing the flat row of plates and 

 central depression. 



C. The same specimen, dorsal view, showing zigzag manner 

 of joining of the two rows, and also the height of the ridge. 



D. Plate of the ridged row. 



E. Plate of the flat row. 



F. Dorso-ventral section, showing unequal sides of specimen. 

 Figure i. Cyclocystoides nitidits, nov. sp. 



Fig, 2. Merocriuiis ciirtis, Ulrich. 



Fig. 3*^^. Cyrtoceias teniiiseptiiiii, nov. sp. showing body- 

 chamber. 



T^b. Smaller specimen, with twenty septa. 



y. Section of 3a. 



Fig. ^a. Longitudinal section of Goiiiphoceras powersi.^ James 

 /. Showing septa and remains of siphuncle. 



\b. Transverse section, showing position and approximate 

 size of siphuncle. {For description of this species with figure, see 

 this Journal, Vol. VIII., p. 255.) 



CLARIFICATION OF THE PUBLIC WATER SUPPLY OF 

 CINCINNATI.* 



By C. R. Stuntz, 



Professor of Chemistry, Woodwar<H Higli School, Cincinnati. 



This paper embodies the following points : 



ist. A brief synopsis of the available material published per- 

 taining to the chemical clarification of water. 



2nd. A record of the experiments that were deemed neces- 

 sary to determine whether the public water supply of Cincinnati 

 can be practically and economically clarified by chemical agents. 



3rd. General deductions from the tests, and some compari- 

 sons of the water clarified by precipitation with that clarified by a 

 combination of precipitation and filtration. 



■•■■This paper is a report prepared by Prof. Stuntz, for the Board of Public 

 Works of Cincinnati. It was given in substance as a lecture before this So- 

 ciety on January 29, then read, by invitation, (by title) at the Society meeting 

 on February 2.— [Note by Editor.] 



