380 The American Geologist. December, looi 
TABLE SHOWING THE DISTRIBUTION OF SPECIES IN THE 
9 11 13 
15 17 
19 21 
23 
24 
29 31 
32 
73 
74 
75 
76 
77 
78 
79 
80 
81 
82 
83 
84 
85 
86 
87 
89 
90 
91 
92 
93 
94 
Platystrophia biforata (Schlotheim) . . . . 
Platystropliia biforata denata (I'ander) 
Platystrophia biforata laticosta (Meek) 
Plat y at rup Ilia bifonila lynx ( lOichwald) . 
HcbvricUa ocridi iilntis sinuata Ilall . . . 
Plictorthis plicutelUi Hall 
Plectorthis alia 
Plectorthis sp 
Retzia granuUfera (Meek) 
Trematis sp 
TKILOBITA. 
Calymene callicepliala Green 
Proetus sp. Indt 
Acidaspis ceralepta Meek 
Acidaspis sp 
Acidaspis sp . . . . ., 
Trinucleus conaentricus Eaton 
CIRRIPEDIA. 
Plumulites sp 
PELECyPODA. 
Anodontopsis sp 
Megambonia jamesi Meek 
GASTROPODA. 
Cyclora minuta Hall 
Cyrtolites irrornatus Hall 
Cyclonema bilix (Conrad) 
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THE CLEVELAND WATER SUPPLY TUNNEL. 
By S. J. PiKRCK, Cli vfianci, C)hio. 
Since 1896, the city of Cleveland, Ohio, has been engaged 
in constructing a new water-works tunnel under lake Erie, 
for the purpose of securing a sufficient and better supply of 
water. During the construction of this tunnel the geological 
features have been noted from time to time. These observa- 
tions, with the records of an older tunnel, are here presented 
to the American Geologtst. The object of this paper is 
to present the observations made and results shown, without 
in any way touching on theoretical ground. 
The Tunnel. 
The new tunnel commences on the east side of the river 
mouth about two and one half miles east of the Public 
Square, and extends in a northwest direction under the lake. 
Its length, from the shore to the permanent steel intake 
crib is 26,000 feet, — a trifle short of five miles. 
The bottom of the tunnel is 100 fpet below the lake level 
at the shore, and 1 10 feet below at the intake crib. This 
gives a slope of two feet per mile to lakeward. The depth 
