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the proglottid breadth. Cirrus short, heavy. Ductus ejaculatorius not 
coiled. 
Vagina anterior or posterior to cirrus-pouch. Sphincter vaginae 
heavy. Uterus with 40—60 lateral out-pocketings on either side and 
with 2—8 ventral pores. Eggs with three membranes. Outer one 
ellipsoidal or spherical. Embryos 0,015—0,016 mm in diameter. 
In Ancistrodon piscivorus. Locality unknown. Material from bottle 
14854 U. S. Bureau of Animal Industry. 
Ophiotaenia trimeresuri (Parona): — This species was first des- 
cribed by Parona (1898) as Taenia trimeresuri. Lühe (1899) examined 
Parona’s specimens and placed them in the genus Zchthyotaenia. An 
examination of the original specimens which Dr. H. B. Ward secured 
from Professor Parona has convinced the writer that the species belongs 
in the genus Ophiotaenia. 
The chief features of the species are: — Characters of genus. 
‘ Testes 100—108 in number, situated in two fields anterior to ovary, 
never posterior to same. Mass of coils of vas deferens not large. Duc- 
tus ejaculatorius much coiled. Cirrus muscular, when protruded swollen 
at the base in which are numerous coils of ductus ejaculatorius. Cirrus- 
pouch large, reaching !/,—?/; across proglottid breadth. 
Vagina anterior or posterior to cirrus-pouch, not crossing same. 
Lobes of ovary flattened, elongate, narrow. Vitelline follicles small. 
Uterus with 20—30 lateral pouches on either side. No ripe eggs ob- 
served. In Trimeresurus formosus, Mentawei. 
Other little and well known species which belong to this genus are: 
From Snakes, 
O. marenzelleri (Barrois) from Ancistrodon piscivorus, 
O. nattereri (Parona) - Coluber sp., 
O. calmettei (Barrois) - Bothrops lanceolatus, 
O. racemosa (Rudolphi) - Coluber sp., 
O. punica (Cholodkovsky) - dog? (probably from asnake), 
O. lactea (Leidy) (sp. inq.) - Nerodia sipedon, 
O. pigmentata (v. Linstow) - Psammodynastes pulverulen- 
tus. 
From Amphibia, 
O. filaroides (La Rue) from Ambiystoma tigrinum, 
O. lönmbergü (Fuhrmann) - Necturus maculatus. 
Ichthyotaenia cryptobothrium v. Linstow from Chrysopelea ornata, 
a tree snake, does not belong here but is a species of Oüchoristica and 
should be known as Oöchoristica cryptobothrium (v. Linstow) La Rue. 
The species of Ichthyotaenia from the Varanidae belong to the genus 
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