64 THE NAUTILUS. 
than under the boiling sun. The first stop was made at a point a 
few miles from the city, where the canal cut through the glacial 
clay or till. In asmall stream by the side of the Santa Fé tracks, 
the conchologists picked up Vivipara contectoides, Planorbis trivol- 
vis, Spherium stamineium and S, simile, the first named species being 
very abundant. 
The second stop was made just east of Summit, where the canal 
cut through blue till, in some places almost as hard as rock.’ In 
one corner of the canal at this locality the bank and ground was 
fairly paved with minute shells perfectly preserved and of a whitish 
or chalky color. From this spot we collected Bythinella nickl- 
niana, Amnicola limosa, A. lustrica, Cincinnatis cineinnatiensis, 
Planorbis truncatus !, P. campanulatus, P. deflectus and Valvata tri- 
carinata, the last two species being represented by thousands of in- 
dividuals. These mollusks are all referable to the Pleistocene 
deposits; P. truncatus was typical and very rare, as but one speci- 
men was found. From the Desplaines River Mr. Woodruff col- 
lected Alasmodonta complanata, A. deltoidea, Anodonta grandis, 
Lampsilis luteolus and Calyculina truncata, the later very large. 
At Willow Springs, which was the next station, I spent about 
three-quarters of an hour hunting for Anodonta imbecilis, but only 
succeeded in finding one half grown specimen. ‘This is the only 
locality, so far as known, for this species in the Chicago area, and 
we had entertained high hopes of finding a “ colony ” of them, but. 
such was not to be. The specimen collected was found in a soft, 
slimy, black mud, filled with broken bottles, tin cans, ete. Under 
an old bridge we found Succinea retusa very plentiful. 
A long stop was made at Lemont to enable the palaeontologists 
to examine the many piles of limestone, which had been blasted from 
the canal, in search of Niagara fossils. Only a few were found, and 
those were very imperfect. Some brachiopods, a few mollusks, in- 
cluding several large Cyrtolites amplicorne, and an occasional Crin- 
oid or trilobite was all that rewarded the geologists. The small boy 
got suddenly rich selling the common Niagara Calymene (C. niag- 
arensis) at from five to twenty-five cents each, according to quality. 
No recent mollusks were found. 
At Romeo, Dr. H. N. Lyon and myself walked half a mile north 
to the Desplaines River, and found a good collecting spot where the 
river ran over a bed of limestone arranged in ledges, and was quite 
1 See Leverett, Bull. 2, Geol. & N., 16Surv., Chi. Acad. Sci., p. 49. 
