371] ANOPLOCEPHALIDJE—DOUTHITT 21 



scolex. In frontal section this bar shows as a projecting tip in the 

 median line. In some specimens however the bar and arches are not 

 recognizable. The grooves never extend to the tip. The suckers open 

 obliquely forward, at an angle of about 45 degrees from the axis of the 

 strobila. The cuticula surrounding the orifice may be a simple fold or 

 there may be as many as four folds of varying prominence. 



The genital anlagen are represented by deeply staining cells even 

 before strobilization is evident. The organs begin to take on recogniza- 

 ble form about the 45th proglottid, and eggs begin to pass into the 

 uterus about the 75th. The genital pore is on the right margin, two- 

 thirds of the length of the proglottid from the anterior end and con- 

 siderably nearer the dorsal than the ventral surface. In some speci- 

 mens it is everted during sexual activity. The cirrus pouch is 200/x 

 long by 75/x wide, and pear-shaped. It extends well across the excretory 

 ducts, dorsad of them. The cirrus is not spiny. Part of the vesicula 

 seminalis occupies the median end ; outside the pouch the vesicula bends 

 upon itself twice, enlarging greatly at its inner end. From here the 

 vas deferens takes a somewhat convoluted course across the proglottid. 

 The testes shrink and apparently break down very early so that indi- 

 vidual recognition is difficult. The number varies from 60 to 85; they 

 are about 65fi long antero-posteriorly and usually somewhat smaller in 

 other dimensions. They occur in the side away from the pore, extend- 

 ing from the median line to the nerve trunk and from ten to twenty lie 

 outside the excretory ducts. They extend forward to slightly beyond 

 the uterus and in the central part of their field entirely through the 

 medullary portion. In expanded specimens it is clear beyond doubt 

 that they are to be considered distal in occurrence, rather than proximal. 

 The vaginal pore is on the ventral surface of the cloaca. The vagina 

 lies ventral of the cirrus pouch, and at its median end usually some- 

 what posterior to it. Its walls are glandular. Just within the excretory 

 canals is the receptaculum seminalis, which is at first clearly divisible 

 into a small lateral and a larger median portion, both of which are 

 about globular in form. Within the circle of the vitelline gland the 

 receptaculum becomes a short, thickwalled tube, which joins the oviduct. 



The ovary lies mostly to the pore side of the median line. It 

 consists of a bar in front of the vitelline gland, turning distad beneath 

 the median end of the latter, with lobes radiating in all directions in 

 the longitudinal plane except directly backwards. The oviduct arises 

 from beneath the median end of the vitelline gland mediad of the cen- 

 tral axis of the ovary. It takes a fairly definite, sinuous course laterad, 

 then proximad, to join the vagina. The common duct takes an irregular 

 course to where it passes into the shell gland. The vitelline gland is a 



