Aulodetus and Paramorphic Shells. — (hii-k-c. '4'27 
One of the most important points to be determined in this 
vicinity is the altitude of the highest shore line on Washing- 
ton island and on the northern extremity of the peninsula 
south of the "door.'* These places are not readily accessible, 
and being under some necessity of economizing our time we 
were obliged to pass them by. If the plane of the beach as 
determined at Birch Creek, Sturgeon Bay, Kewaunee, and Two 
Rivers, be projected southward at the same inclination it will 
pass under the present level of the lake along the submerged 
terraces in front of Manitowoc and Sheboygan. By a com- 
parison with the shore line on the east coast, the beach on the 
west side, excluding the Marquette observation, appears to be 
as a whole about 20 to 30 feet lower in the same latitude. The 
terraces observed by Mr. Leverett farther south probably 
mark the shore of lake Michigan during the activity of the 
Chicago outlet. Those in the basin of the Fox river and 
Winnebago lake probably mark the margin of a glacial lake 
at the time of the retreat of the ice-sheet. It is at least cer- 
tain that those terraces are entirely above the level of the 
clearly defined beach here described. 
AMERICAN SPECIES OF AUTODETUS AND SOME 
PARAMORPHIC SHELLS FROM THE 
DEVONIAN. 
By John M. Clarke, Albany, N. Y. 
Autodetus is a term proposed by Lindstrom in INN4* for a 
small, attached and sinistrally coiled shell, abounding in the 
Silurian (=Upper Silurian) strata of the island of Gotland. 
Originally described from the faunas of Oesel, under the 
name Capulus colyptratus Schrenck.f the only known Euro- 
pean species had become quite generally recognized as a char- 
acteristic Silurian fossil. In the same year that Lindstrom 
introduced this generic term, Quenstedt proposed to designate 
the same shell by the generic term Anticalyptrwa* anil the 
citation of this name by Lindstrftm attests its publication be- 
fore the issuance of the latter's work. Though Lindstrom 
*( >n the Silurian Gastropoda and Pteropoda of Gotland, p. 185. 
fUebersichl des Schichtensyst. Liv. und Esthl., \>. 83, 1854. 
JHandb. der Petrefactenkunde, ::<l Ed., \>. 673. 
