INVERTEBRATE FAUNA OF LAKE SUPERIOR. 699 



Siibcyliurtrical, thicker anteriorly, distinctly anniilated, composed of 

 about 42 segments. Lengtb, 6"""; diameter, about 0""".5. Cephalic lobe 

 short, conical, obtuse ; mouth large, semicircular. Ventral fascicles with 

 eight or nine setre anteriorly; five or six posteriorly. The set?e are 

 long, slender, acute, strongly curved; those on the inferior side of the 

 fascicles nearly twice as long as those of the upp2r side ; sette of the 

 lateral fascicles five or six, slender, nearly as long as those of the ventral 

 ones, and similar in form; dorsaj fascicles with four or five shorter, 

 stouter, and straighter, acute setfe. 



Six miles southeast of Passage Island, 47 fathoms ; on line from the 

 Slate Islands toward Staunard Rock, fourth haul, 159 fathoms. 



TUBIFEX PROFUNDICOLA Vcrrill. 



Americau Journal of Science, 3d series, vol. ii, p. 450, 1871 ; and Preliminary 

 Report on Dredging in Lake Superior, ]}. 1024, 1871. 



A rather stout species for the genus, about 25'""" to 35""" long, 1'"'".25 

 in diameter anteriorly", more slender posteriorly, (0'"'".5 in diameter.) Ce- 

 phalic lobe short, conical; one specimen apparently had two minute ocelli. 

 Mouth large, semicircular. Intestine moniliform, with two simple red 

 blood-vessels running along its whole length and uniting at the constric- 

 tions. In the first five or six segments, there are slender vessels of 

 nearly uniform size, which form lateral loops in each segment. Anus 

 terminal, wide, with about ten small lobes. Setoe in four fascicles upon 

 each segment. Those of the lateral fascicles three anteriorly, often but 

 two, short, slightly curved, mostly with minute forked and hooked tips ; 

 those of the ventral series in fascicles of four to six, three or four times 

 longer thau the upper ones, considerably bent, tbe ends minutely hooked 

 and forked. 



Neepigon Bay, 32 fathoms. 



BDELLODEA. 



Maceobdella DECORA Verrill. (p. 0G8.) 



Collected at Madeline Island by Mr. J. W. Milner. 

 AULAST0MU3I LACUSTEE Leidy. (p. 070.) 



Lake Superior, (Leidy.) 

 Semiscolex GrRANDis Verrill, var. maculom. (p. 672.) 



Collected at Madeline Island by Mr. J. AY. Milner. 

 Nephelis lateealis Verrill. (p. 675.) 



Collected with the last species at Madeline Island by Mr. IMilner, and 

 a young specimen was also dredged in 6 to 8 fathoms among the Slate 

 Islands. 



Nephelis FERVID a Verrill. (p. 676.) 



Dredged in 1871, in 8 to 13 fathoms, on the south side of Saint Ignace 

 Island ; also from stomach of Coreyonus qiiadrilateralls taken at Made- 

 line Island. 



