3 6 
PACIFIC SCIENCE, VoL XXII, January 1968 
the dorsal side a little anterior to the ovarian 
isthmus; the incipient uterus proper is seen as 
a wide, laterally crenulated lumen reaching to 
the base of the cirrus pouch. No eggs observed. 
The presence of a large elliptical seminal re- 
ceptacle connected with the germiduct by a 
wide seminal duct, as shown in Fig. 7C and 
Fig. 7D, is one of the most important charac- 
teristics of this species. 
discussion: Because the original description 
of this species by Shipley and Hornell is inade- 
quate, no detailed comparison is possible be- 
tween Cephalobothrium aetobatidis from Cey- 
lon and the Hawaiian representative from the 
same host species, but from agreement in ex- 
ternal anatomy there is no doubt that both are 
identical. The statement by Shipley and Hornell 
that the terminal "sucker” is round, with thick- 
ened edges, and their figure of the scolex appear 
misleading, because the apical muscle pad lack- 
ing a suctorial lumen is by no means a true 
sucker, and the collar-like circular fold encir- 
cling the apical pad is not shown in their figure. 
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Linton, E. 1889. Notes on cestoid entozoa of 
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1889. Notes on entozoa of marine fishes 
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Nybelin, O. 1922. An atomisch sys tematische 
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Yamaguti, S. 1934. Studies on the helminth 
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