ENTOZOA. by 



bedded is beset with numerous minute nucleated cells. These, doubt- 

 less, take an important share, by their assimilative and reproductive 

 powers, in the general nutrition of the body. The subcutaneous 

 tissue is also characterised by the minute, clear and colourless cal- 

 careous bodies which are common in the cystic entozoa. There are 

 also globules of oil. 



The TaeniaB are androgynous, and each joint contains a compli- 

 cated male and female apparatus equal to the production of thousands 

 of impregnated ova. The ova are developed in a large, branched 

 ovarium {fig. 28, c\ occupying almost the whole space included by 

 the nutrient canals, at least in the posterior segments, where it is 

 very conspicuous from the amber colour of the more mature ova. 

 The oviduct is continued from near the middle of the dendritic ovary 

 to the marginal papilla, where it terminates by a small orifice, some- 

 times produced into a vulva, posterior to the pore of the male organs. 

 The parts of the male apparatus which have at present been recog- 

 nised consist of a small pyriform vesicle {fig- 28, h\ situated near 

 the middle of the posterior margin of the segment ; this, however, is 

 most probably only a seminal vesicle, and not the testis. The vas 

 deferens is continued from the vesicle with slight undulations, to the 

 middle of the segment, where it bends upon itself at a right angle, 

 and terminates at the generative pore {^fig- 28, a), from which the 

 lemniscus, or rudimental penis, projects. The ova may be fecundated 

 by intromission of the lemniscus into the vulva before they escape. 



The segments containing the mature ova are most commonly 

 detached and separately expelled. The development and metamor- 

 phoses of the embryo Tjeniag have not yet been completely traced out. 

 But much has recently been done, especially by the sharp-sighted 

 and clear-minded Siebold, to whose most valuable observations on 

 this subject we shall return, after the description of the generative 

 organs in the Bothriocephalus latus. 



For a knowledge of the minute anatomy of this species of human 

 tapeworm {figs. 29, and 30), we are indebted to the admirable skill 

 and patience of Professor Eschricht, of Copenhagen, whose work* 

 on the subject has received the prize of the Academy of Sciences, 

 at Berlin. His observations were made on a specimen of the worm 

 which, after various remedies, was dislodged from one of his patients.f 



* LXIV. 



f In Denmark, as in Holland, the Tcenia solium is the common tapeworm ; but 

 the case in question occurred in a female aged twenty-three, born at St. Petersburg, 

 of Russian parents, Avho had spent almost all her childhood and youth at Copen- 

 hagen, with, however, occasional sojourns of three or four months' duration in 

 Russia. The usual symptoms of tapeworm, with occasional ejection of fragments 



F 3 



