94 DR. T. S. COBBOLD ON CYSTIC ENTOZOA, [Mar. 12, 



being attached to the mesenteric folds of the peritonenm. All five 

 bear a close resemblance to one another, but they differ very mate- 

 rially from the Cysticercus infesting the ^Ethiopian "VVart Hog. 

 Those attached to the mesentery were also encysted ; but in these 

 instances the envelope appeared to be merely a production of the 

 peritoneal membrane itself, and not an abnormal product, such as 

 had clearly resulted from inflammatory action, both in the case of 

 the liver-cyst and in the fibrous capsule of Cysticercus ex Phaco- 

 chcero cethiopico. Tlie Cysticerci of the Red River Hog, when with- 

 drawn from their enveloping membranes, exhibited a more or less 

 oval or elliptic outline, as may be seen in the example selected for 

 illustration (fig. 3). This drawing shows only the neck (6), body 

 (c), and enormously developed caudal vesicle {d). The head, being 

 inverted and enclosed within the upper part of the neck, could only 

 be found after a prolonged dissection and unfolding of the partSi 

 When this was done, and the head placed under an inch objective, 

 it was found to display the usual four sucking disks, and a double 

 coronet of hooks, as represented in the accompanying illustration 

 (fig. 4). The margin of the neck is bordered by a double contour, 

 the parenchymatous substance being everywhere studded with a mul- 

 titude of calcareous corpuscles, which are not limited to the neck itself, 

 but are also present in the head. To these bodies I shall again have 

 occasion to allude, whilst I revert in the mean time to the body and 

 caudal vesicle of our Cysticercus. The former is about half an inch 

 long, and somewhat distended by the presence of soft, irregular bundles 

 of tissue in its interior. This tissue occurs in the form of shreds or 

 rope-like coils {e, fig. 3), which become finely attenuated below, and 

 depend loosely into the cavity of the caudal vesicle. Histologically, 

 they merely consist of a fine granular matter, and therefore they are 

 not referable to any specialized structure or set of organs. Neither 

 the body nor the vesicle exhibits the transverse striae seen in the Cysti- 

 cercus from the Wart Hog ; but, in addition to a few irregular surface- 

 foldings, the lining membrane of the vesicle gives off here and there 

 some extremely delicate thread-like filaments (/), having the same 

 structural character as those bundles of granular parenchyma found 

 within the body. A little circular spot marks their origin ; and from 

 this they hang floating in the fluid contents of the vesicle. 



I have investigated the so-called calcareous corpuscles of this Scolex 

 or Cysticerciis ex Pota7nochoero j)emciJlato with very great care; but 

 I did not detect any of them within the walls of the caudal vesicle. 

 They are extraordinarily abundant within the head and neck, and 

 by their highly refracting properties impart to the tissues, when 

 Anewed by transmitted light, a dark pigment-like hue, almost obli- 

 terating the limiting membranes of the inverted head. They are 

 more numerous than I have indicated in the accompanying drawing 

 (fig. 4), but their relative disposition and size are accurately repre- 

 sented. Their form is commonly that of spherical, or oval, flattened 

 disks (fig. 5/j c, e) ; but not unfrequently they are elongated, oc- 

 casionally thicker at one end than the other (a, d), and sometimes 

 reniform (b) . All are bordered by an opake margin ; and they often 



