484 



REPORT ON ZOOLOGY, MDCCCXLIV. 



is found not only in the brain, but also in the medulla 

 oblongata and spinalis of the Sheep, and is, in fact, a para- 

 site peculiar to the medullary substance, in which, according 

 to its site, it produces sometimes the " sturdy " or " dizzy," 

 (Drehkrankheit), and sometimes the "Gnubber," or the "Tra- 

 berkrankheit." These three different forms of disease would 

 also be better named according to the situation of the 

 Ccenurus, viz. " Hydrocephalus hydatideus," " Hydrops 

 hydatideus medullse spinalis," or " medullse oblongatee." 



A Ccenurus has [however] been found by Mr. Rose 

 (London Med. Gazette, 1844, July, p. 525) also between 

 the lumbar muscles, as well as in the neck and back of 

 Rabbits. In one case he observed a large cyst in the sub- 

 cutaneous cellular tissue over the dorsal and lumbar mus- 

 cles, which was formed of three or four intercommunicating 

 compartments. The largest compartment of this cyst con- 

 tained two large hydatids, but besides these there were 

 several other smaller vesicles, some free, some attached ; 

 young, completely-formed hydatids projected externally on 

 the larger ones. 



Goodsir (Transactions Roy. Soc. of Edinburgh, vol. xv, 

 1844, p. 561) explains the development of Ccenurus cere- 

 bralis, and describes the ova concealed in the neck of 

 the Ccenurus -heads. In the figures that are given of these 

 supposed ova, in which Goodsir thinks that he has seen not 

 only egg-membrane, vitelline membrane, germinal vesicle, 

 and germinal spot, but also, even the division of the vitellus, 

 every unprejudiced observer will at once recognise the dis- 

 coid calcareous corpuscles. That Goodsir could not perceive 

 the way by which these ova escaped will readily be believed. 

 According to Bellingham (Annals Nat. Hist, xiv, p. 401), 

 both Coenurus cerebralis and Echinococcus hominis also occur 

 in Ireland. To the number of these Irish entozoa collected 

 by Bellingham, Thompson (ib. p. 439) has besides added 

 six others. 



Many observations have been made of late years respecting 

 the Echwococcns ; in consequence of which it is gratifying 



