INVERTEBRATE FAUNA OF LAKE SUPERIOR. G91 



ing, with the addition of an inner bag of embroidery canvas, which was 

 found necessary to retain the exceedingly fine cUiyey mud encountered 

 at nearly every haul. 



The following list will show the localities at which dredgings were 

 made, the depth, and the composition of the bottom : 



Simmons' Harbor, on the north shore of the lake, about twelve and a 

 half miles north-northwest of Otter Island, August 9, 13 to 15 fathoms, 

 bottom of fine sand, with scattered tufts of a small alga of the genus 

 Clado2)hora. 



Five miles off Simmons' Harbor, August 11, 60 fathoms, soft bluish 

 clay. 



Among the Slate Ishmds, August 14, while at anchor, two hauls : 

 first, 12 to 14 fathoms, sand, with a little fine mud; second, from the 

 other end of the steamer, 6 to 8 fathoms, sand, gravel, and small stones, 

 with some mud. 



On a line from the Slate Islands toward Stannard Rock, August 15, 

 four hauls were made as follows : First, about eighteen miles south of 

 the W'cstern end of the islands, 105 fathoms, soft clay; second, about 

 thirty-five miles from the islands, 169 fathoms, the deepest point yet 

 found in the lake, very soft light-drab cla^^, with small pieces of rotten 

 wood ; third, about forty miles from the islands, 116 fathoms, bottom 

 same as in the last haul ; fourth, about fifty-seven miles from the 

 islands, 159 fathoms, very soft clay. 



On a line southeast from Passage Island, off the east end of He 

 E-oyale, August 18, hauls were made at five points : First, about sis 

 miles out, 47 fathoms, soft, reddish-clay and sand ; second, about fifteen 

 miles from Passage Island, 129 fathoms, soft clay; third, about twenty- 

 nine miles from the island, 127 fathoms, bottom same as last haul ; 

 fourth, about forty-three miles from the island, 134 fathoms, bottom as 

 in the last two hauls ; fifth, about fourteen miles north of Keweenaw 

 Point, 82 fathoms, two hauls, reddish clayey mud and sand. 



North of Copper Harbor, August 22, dredgings were made at three 

 different points: First, seventeen miles off, 148 fathoms, soft clay; 

 second, nearer the shore, 62 fathoms, soft, reddish mud and sand ; third, 

 within a quarter of a mile of the shore, 17 fathoms, sand. 



Off fifty miles, on a course northeast by east one-half north of Copper 

 Harbor, August 24, 116 fathoms, soft clay. 



In Neepigon Bay, due north of Saint Ignace station and half a mile 

 from the shore of Saint Ignace Island, August 28, 32 fathoms, very soft 

 clayey mud. 



In the cove at the eastern end of Saint Ignace Island, near Saint 

 Ignace station, August 29, 4 to 6 fathoms, sand, with some mud, bits of 

 wood, &c. 



About three miles south of the same cove, August 29, 73 fathoms, 

 soft clayey mud. 



In a small harbor on the south side of Saint Ignace Island, between 



