Smith and Verrill—Dredgings in Lake Superior. 449 
Planorbis parvus Say. Common in 8 to 18 fathoms on the 
south side of St. Ignace. 
Valvatu sincera (Say sp.). Abundant with the last species, 
in 8 to 13 fathoms, and also, in 4 to 6 fathoms, in the cove at 
the eastern end of the same island. 
Spherium sp. nov.? Among the Slate Islands, in 6 to 8 
fathoms. A single young specimen of another species of Sphe- 
— was found, in 8 to 13 fathoms, on the south side of St. 
gnace. 
Pisidium Virginicum Bourguignat. On the south side of St. 
Ignace, 8 to 13 fathoms. 
sidium abditum Haldeman. With the last species, in 8 to 
13 fathoms, and also, in 4 to 6 fathoms, in the cove at the 
eastern end of the same island. . 
wsidium compressum Prime. In the cove at the eastern end 
of St. Ignace, 4 to 6 fathoms. 
isidium sp. nov. A small, semi-translucent species, the same 
6 fathoms, and abundant among Cladophora, in 8 to 18 fathoms, 
on the south side of that island; among the Slate Islands, in 6 
to 8 and 12 to 14 fathoms; at 13 to 15 fathoms on a sandy © 
bottom in Simmon’s Harbor; near Copper Harbor, in 17 fathoms, 
clear sand; in 82 fathoms, very soft —- mud, in Neepigon 
Bay ; off Copper Harbor, in 62 fathoms, and north of Keweenaw 
Point, in 82 fathoms, soft reddish clayey mud and sand; an 
in all the deep dredging down to 159 fathoms. 
W opMs. 
Lumbricus lacustris Verrill, sp. nov. About 15 inches long, 
‘04 in diameter. Body round, distinctly annulated. Head 
short, conical, obtusely pointed. Sete spine-like, strongly 
curved, acute, arranged two by two, those of each pair close 
together. Color reddish brown. 
san 
lobes. Setae in four, fan-shaped fascicles on each segment, com- 
mencing at second segment behind the mouth. The two 
ventral fascicles are separated by a space equal to about pied 
the length of the sete, of which there are five or six In eac 
fascicle ; the sate are simple, acute, slightly curved, equal to 
