476 
Uterus with 6—12 lateral pouches on either side. Embryos 0,0212 to 
0,0265 mm in length, second egg-membrane 0,037—0,04 mm in diameter. 
This species long thought to be the same as 7. ocellata Rud. is 
really very different. The description is based on material obtained by 
Dr. H. B. Ward from Prof. Max Braun. The host is Acerina cernua 
Linn., locality Königsberg, Prussia. 
P. dubius nov. spec.: — With characters of genus. Cestodes small, 
40 mm long x 0,8—1,2 mm broad. Segmentation not clear. About 
100 proglottids. Head small, 0,127—0,212 mm broad, well set off 
from neck. Four suckers 0,069—0,08 mm in diameter, fifth 0,026 to 
0,037 mm. Neck slender, 1,8—3,5 mm long. First proglottids broader 
than long, 0,20 mm prow <0) 05 mm long, mature ones quadrate or 
longer than pedal ripe ones qu broader than long or longer than 
broad, 1,19 mm long x 0,68 mm broad to 0,68 mm long x 1,02 mm 
broad. End proglottid triangular, small, functional. 
Genital pore marginal, at end of first half of proglottid, irregularly 
alternating. No genital papilla. Testes in two layers, 55—60 in num- 
ber. Cirrus-pouch slender, 0,265—0,425 mm long, reaching about half 
across proglottid. Cirrus ont and slender when protruded, straight 
when within cirrus-pouch. 
Vagina anterior to cirrus-pouch, crossing ante of latter. Vitel- 
laria sparse. Uterus with 7—14 lateral pouches on either side and with 
1-—2 ventral pores. Embryos 0,032 mm in diameter. 
This species was first described by Zschokke (1884) as Taenia 
filicollis Rud. The preceding description, however, is based on speci- 
mens which Dr. H. B. Ward secured from Professor Parona. The 
host is Perca fluviatilis Linn., locality, Lake Geneva or Lake Lucerne. 
Proteocephalus fallax nov. spec.: — With characters of the genus. 
Cestodes small, up to 100 mm long by 1,2 mm broad. Head globose, 
0,15—0,2 mm broad by 0,105—0,15 mm thick, well set off from neck. 
Suckers 0,064—0,085 mm in diameter. Fifth sucker functional, 
0,058 mm in diameter. Neck slender 2—6 mm long. First proglottids 
quadrate or longer than broad. Mature proglottids quadrate or broader 
than long, 0,34—0,46 mm broad by 0,34 mm long. Ripe proglottids 
longer than broad, rarely measuring as much as 1,19 mm broad by 
1,36 mm long. Segmentation not clear. 
Genital pore irregularly alternating, near middle of lateral margin 
of proglottid. Testes 30—35, in one layer. Cirrus-pouch 0,196 to 
0,255 mm long in mature, and 0,37—0,42 mm long in ripe proglottids. 
Vagina anterior to cirrus-pouch. Vitellaria sparse. Uterus with 
6—8 lateral pouches on either side and with 2—3 ventral pores. Em- 
