INVERTEBRATE FAUNA OF LAKE SUPERIOR. 699 



Subcylindrical, thicker anteriorl}', distiuctly annulated, composed of 

 about 42 segiueuls. Lengtb, C""'; diameter, about 0"™.5. Cepbalic lobe 

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

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

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

 fascicles nearly twice as long as those of the upper side ; setsa of the 

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

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

 stouter, and straighter, acute sette. 



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

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



TuBiFEX PEOFUNDICOLA Yerrill. 



American Journal of Science, 3(1 series, vol. ii, p. 450, 1871 ; and Preliminary 

 Report on Dredging in Lake Superior, p. 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. Setae in four fascicles upon 

 each segment. Those of the lateral fasciclos 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 than the upper ones, considerably bent, the ends minutely hooked 

 and forked. 



Neepigon Bay, 32 fathoms. 



BDELLODEA. 



Macrobdella decora Verrill. (p. 6CS.) 



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

 AuLASTOMUM LACUSTRE Leidy. (p. 670.) 



Lake Superior, (Leidy.) 

 Semiscolex grandis Verrill, var. maculosa, (p. G72.) 



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

 ~Nephelis lateralis Verrill. (p. 675.) 



Collected with the last species at Madeline Island by Mr. ]\rilner, and 

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

 Islands. 



oSTephelis fervida Verrill. (p. 676.)' 



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

 Island; also from stomach of Corcgonus qiiadr Hater aUs taken at Made- 

 line Island. 



