ENTOZOA. 



71 



30 



Bothr. latus. 



cally, by an anterior suctorious mouth, leading to a gullet, which 

 bifurcates m the neck to form the two Ion- 31 

 gitudinal canals. Eschricht could not detect the 

 transverse anastomosing canals. We shall be 

 justified, perhaps, by the analogy of a species 

 of Bothriocephalus from the Python*, in which 

 I succeeded in injecting with quicksilver both 

 the longitudinal and transverse canals, in con- 

 cluding that the anastomosing channels are pre- 

 sent at the posterior margins of the segments in 

 the Bothriocephalus of the human species. Sie- 

 bold states that the annular vessel by which the nutrient 

 canals commence in the rostellated TcBuice^ is not present 

 in the genus Bothriocephalus, nor in the unarmed Taenia 

 rostellata and Caryophyll<EUS mutabilis : in these tape- 

 worms four longitudinal vessels when they approach the 

 head begin to ramify and form there a rich network. This 

 arrangement is more favourable to the idea of nutrition 

 by cutaneous absorption, than by a hypothetical mouth 

 and bifurcating gullet. 



Innumerable and very minute nucleated cells are apparently disse- 

 minated through the tissue of the Bothriocephalus. Eschricht 

 points out their analogy to the blood-cells in the lower animals, but 

 could not perceive any ramified system of blood-vessels, superadded 

 to the longitudinal canals. 



At the deepest part of each segment there is a stratum of whitish 

 granules or glands (Jig' 32, «, «), composed of a cluster of minute 



blind sacculi, filled with opake fluid, 

 each group or gland being sus- 

 pended in a separate cell, the pedicle 

 of which is, without doubt, the duct 

 of the sacculated gland which 

 Eschi'icht regards as a testis, and 

 estimates at 400 in number at each 

 Bothr. latus. joint. Their ducts unite to form a 



network^ having the capsules of the gland in the interspaces. The 

 vas deferens (Jig. 32, b), is best seen on the dorsal aspect of the joint, 

 along the middle of which it runs in close transverse folds, pro- 

 gressively increasing in breadth, until it terminates in a pyriform 

 seminal receptacle or "bursa penis" (Jig. 32, c). From this bursa a 

 small lemniscus is protruded through the anterior of the two 



32 



Prep. 



No. 846. A. 

 F 4 



