BUMINANTIA 333 



suffering from tapeworm no precautions are taken to prevent cattle 

 from having access to the expelled proglottides of Ttenia medio- 

 canellata. The subject has already been dealt with in the first part 

 of this work, and also in my ' Manual/ quoted in the bibliography. 

 The mutton measle is described under the heading of T&nia 

 tenella. In like manner I must refer to the ' Manual' for a detailed 

 account of the gid hydatid (Coenurus cerebralis}. How many kinds 

 of Coenuri exist it is impossible to say, but I am of opinion that 

 the various polycephalous bladder-worms found by Rose, Baillet, 

 and Alston in rabbits, by myself in a lemur and in a squirrel, 

 and by Engelmeyer in the liver of a cat, are referable to tape- 

 worms specifically distinct from the Taenia coenurus of the dog. 

 It was in 1833 that Mr C. B. Rose, formerly of Swaffham, 

 Norfolk, discovered an undoubted example of polycephalous 

 hydatid in the rabbit, the parasite in question bearing a very 

 close resemblance to Gcenurus cerebralis. As the accuracy of 

 Rose's determination respecting the characters of the hydatid 

 has been called in question, I again invite attention to the 

 original description as recorded in the ' London Medical Gazette ' 

 for November 9th, 1833. At page 206, vol. xiii, of that perio- 

 dical, after describing the common Ccenurus cerebralis of the 

 sheep, Rose writes : te This (i.e. C. cerebralis) is the only 

 species of Coenurus noticed by authors, but I have met with 

 another. It infests the rabbit, and I have found it situated 

 between the muscles of the loins. It is also met with in the 

 neck and back. This hydatid grows rapidly, and multiplies 

 prodigiously, and being seated near the surface it soon projects, 

 and sometimes forms a tumour of considerable magnitude. 

 When the warrener meets with a rabbit thus affected, he punc- 

 tures the tumour, squeezes out the fluid, and sends the animal 

 to market with its brethren. I possess a specimen of this 

 species in a pregnant state. The earliest visible state of gesta- 

 tion is a minute spot, more transparent than the surrounding 

 coats of the parent; this enlarges till it projects from the 

 parietes of the maternal vesicle. It continues to enlarge until 

 it becomes a perfect hydatid, attached by a slender peduncle 

 only ; even whilst small, other young are seen sprouting from 

 it, and so on in a series of three or four. My specimen 

 exhibits them in every stage of growth, from a minute point to 

 a vesicle the size of a hen's egg. As I can see no difference 

 in structure between this hydatid and the last-mentioned (i.e. 

 Coenurus cerebralis), I am unwilling to consider it a different 



