358 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Fig. 24. Longitudinal section, near median line, parallel to margin of strobile ; the uterine walls have 
been absorbed and the ova lie in masses ; the segmented appearance of the body is here 
shown to be only superficial. 
Fig. 25. Transverse section through cirrus bulb, highly magnified ; a, retractor muscles of cirrus. 
Fig. 26. Transverse section through beginning of vagina, showing the enlargement of that organ near 
the vaginal orifice into a seminal receptacle, highly magnified. 
Fig. 27. Transverse section of mature segment showing the different layers of the body. 
Plate CXIX. 
(Adult stage of Dihoihrium cordiceps Leidy, intestine 6f white pelican.) 
Fig. 28. Diagrammatic sketch of mature segment, showing relative position of genitalia, etc. 
Fig. 29. Ovum as seen in a thin section of a mature segment ; the knife has cut away, a part of the 
shell exposing the granular contents collected into spherical masses, highly magnified. 
Fig. 30. Diagram of female generative organs, from ventral side; v. d., vitelline duct. 
Fig. 31. Section of vagina, highly magnified, showing ciliated interior. 
Fig. 32. Portion of transverse section of segment, highly magnified ; Par., parenchyma of inner core 
of body. 
Fig. 33. Longitudinal median section, parallel to the margin, through cirrus bulb, uterus, vagina, etc. 
Fig. 34. Transverse section of head ; n, nerve ganglia, a row of which extends across the section from 
the inner margin of one marginal vessel to the other. The heavy stippling represents the 
cut ends of longitudinal muscles ; s. c., subcuticular longitudinal fibers particularly well 
developed in the hothria. 
