54 



vesicle is large (1, 2, 4, 6", and more), frequently enor- 

 mous (sometimes attaining, in animals, the size of a 

 child's head), of extreme thinness, and is remarkable 

 for the concentric wrinkles visible externally, and 

 which are crossed by fine longitudinal striae, giving it 

 a chequered appearance (Kuchenmeister). The body 

 is from 14 to 30 mil. and more in length, and from 5 

 to 10 mil. in breadth, broad and cylindrical; the neck 

 is from 8 to 15 mil. long. 



Even in the forin of the scolex, this parasite is rare ; 

 so that, by some modern authors, it has either been 

 stricken out of the list, or else considered as a doubt- 

 ful Helminth. Eschricht, of Denmark, quotes in all 

 five cases of the occurrence of this parasite in the 

 human body; one reported by Kolpin, one by Treut- 

 ler, one by Zeder, and two by Schleissner. They 

 occurred in Iceland. Kuchenmeister, however, con- 

 tends that but one of the cases reported (Schleiss- 

 ner's) was that of true C. tenuicollis, while the others 

 were the young of other species. " This is a mistake 

 which can easily be made, inasmuch as, when the 

 enveloping cyst is unopened, there is sometimes hardly 

 any external difference between the Echinococeus and 

 the C. tenuicollis, especially when the latter is in the 

 liver." 



3. Oysticercus acanthotrias (PL III. fig. 6). For 

 the description of this parasite we are indebted to Dr. 

 Weinland, who found it in the collection of the Soci- 

 ety of Medical Improvement, of Boston, Mass. It was 

 supposed to have been a cysticercus cellulosse, and 

 was obtained from the body of a white woman, set. 50, 



