478 
Michigan Fish Comm. in 1894. The hosts are Coregonus nigripinnis, 
C. prognathus, C.artedi. Specimens from these same lots were diag- 
nosed and described by Benedict (1900) as Proteocephalus ocellatus Rud. 
Proteocephalus pinguis nov. spec.: — With characters of genus. 
Strobila short, slender. Max. length observed 90 mm by a breadth of 
1,24 mm. Neck slender, 3—7 mm long. First proglottids very short, 
older ones about quadrate, length rarely exceeding breadth. End pro- 
glottid present and functional. Segmentation not distinct. Head coni- 
cal but showing great variations in shape, breadth about 0,33 mm. 
Suckers deep, muscular, 0,095—0,105 mm in diameter. Fifth sucker 
muscular, functional, 0,05—0,075 mm in diameter. 
Genital pore near middle of proglottid margin, irregularly alter- 
nating. Testes ovoidal, 54—70 in number, forming a single layer. 
Cirrus straight, short. Cirrus-pouch 0,13—0,14 mm long, reaching 
1/;—1/, across proglottid breadth. 
Vagina anterior to cirrus-pouch, crossing inner end of latter. Ute- 
rus with 10—14 lateral pouches on either side and with 2—3 ventral 
pores. Embryos 0,016—0,018 mm in diameter. : 
This new species is based on specimens collected by Dr. H. B. 
Ward from Esox reticulatus, Sebago Lake, Me. and by Prof. T. L. 
Hankinson from Esox lucius, Walnut Lake, Mich. and by A. J. 
Coates from Esox lucius, Lake Geneva, Wis. 
Proteocephalus perplerus nov. spec.: — With characters of genus. 
Length 15,5 cm by max. breadth of 1,7 mm. Segmentation plain, 
angles of proglottids sharp and distinct. Ripe proglottids quadrate 
or longer than broad, others broader than long. Head globose, with 
four deep furrows, frequently with small papilla at apex. Head 0,6 to 
0,7 mm broad by 0,42—0,51 mm long. Suckers four, 0,34—0,46 mm 
long by 0,25—0,27 mm broad, with deep cavities. No fifth sucker. 
Neck broad, thick, 0,5 mm long. 
Genital pore lateral, at end of first fourth or half of proglottid, 
irregularly alternate. Cirrus-pouch 0,30—0,344 mm long, reaching 
1, —1/, across proglottid breadth. Ductus ejaculatorius coiled. Pro- 
truded cirrus 0,60 mm long. Testes 135—155, in one layer. 
Vagina anterior to cirrus-pouch, never crossing same. Beginning 
region dilated. Dilatation terminated at inner end by sphincter vaginae. 
Vagina ciliated. Vitellaria voluminous, follicles large, some of them 
forming a group along posterior margin of proglottid. Uterus with 
20—25 lateral pouches on either side and with 2—4 ventral pores. 
Embryos 0,013-——0,014 >< 0,014— 0,016 mm, second egg-membrane 
0,019—0,030 mm, outer membrane 0,024— 0,036 mm in diameter. 
