30 PROCEEDINGS OP THE NATIONAL MUSEUM vol.70 



preceding proglottides. The strobiles are throughout their length 

 thick and robust. The genital pores are unilateral, the cirrus, so far 

 as could be made out, is rather short and smooth; the inner two- 

 thirds, or more, of the cirrus-pouch is cylindrical and acts as a 

 seminal vesicle. It is connected by a slender vas deferens with an 

 elongated and capacious inner seminal vesicle. The testes are three 

 in number, relatively large and lie near together in the median 

 region. In sections of younger portions of the strobile the two 

 anti-poral testes touch each other, and the poral testis lies very close 

 to its anti-poral neighbor. Sections made farther back, where the 

 female genitalia are developing, show a greater space between the 

 poral and the nearer anti-poral testis, but the testes remain com- 

 paratively close together. The ovary is relatively small and lobed; 

 the vitelline gland still smaller, compact, and situated on the ventral 

 side of the ovary. The vagina is seen in transverse sections to lie 

 along the ventral side of the cirrus-pouch. For a short distance 

 it is thick- walled then it becomes thin-walled and slender for a dis- 

 tance approximately equal to the length of the cirrus-pouch, when it 

 expands into an elongated, more or less sinuous seminal receptacle. 

 The cirrus-pouch and vagina pass dorsally to the excretory vessels. 

 The excretory vessels lie close together, the ventral much larger 

 than the dorsal, and both are thtown into close spirals. The uterus, 

 as seen in transverse sections, appears to be tubular, and probably 

 lobed. Portions of it appear in the mid dorsal region extending 

 lateral to the excretory vessels nearly to the lateral limits of the 

 medullary area, and in the medullary area on the anti-poral side of 

 the ovary. The uterus in these sections does not contain ova, but 

 is filled with germ cells intermixed with yolk granules. There are 

 two layers of longitudinal muscle fascicles. The outer layer is con- 

 tinuous, the inner interrupted, and represented by about 8 dorsal 

 and 8 ventral fascicles in the median region, and by one or two 

 fascicles, dorsal and ventral, in the vicinity of the excretory vessels. 

 The strobiles are too thick for satisfactory study as whole mounts. 

 In thick frontal sections of adult proglottides the small, lobed 

 ovaries, and compact vitelline glands along the median line, the 

 capacious seminal vesicles and seminal receptacles on the poral side 

 of the median line, and the close spirals of the ventral excretory ves- 

 sels are the most conspicuous objects. Both the seminal vesicles and 

 seminal receptacles were filled with spermatozoa. The testes, while 

 plainly seen, are not so conspicuous as the ovary and seminal vessels. 

 Maximum length of strobile 128 mm. ; maximum breadth 2 mm. 



The above description was based on material from Oidemia per- 

 spicillata. Following are notes on strobiles, scoleces missing, from 

 Glaucionetta clangula americana. 



