Miscellaneous. 155 



This species has some resemblance to the Enchelis nebulosa of 

 Ehrenberg, which M. Gleichen observed in an infusion of barley. 



Fourth species. — Form oval ; no carapace ; vibrating cilia over the 

 whole surface of the body ; buccal orihce at one of the extremities ; 

 very rapid rotatory movements ; length yVth of a millimetre, breadth 

 g^yth. This species has a great analogy with the Leiicophrijs anodoiitm 

 of Ehrenberg, and which M. Midler observed in the water of the 

 Mytilus edulis *. 



The carapace, or transparent envelope of these animalcules allows 

 the alimentary molecules by which they are nourished, and which 

 render their bodies more or less opake, to be recognised in their in- 

 terior. 



The number of these animalcules is so considerable, that, in 5 

 centigrammes of alimentary matters taken from the first two sto- 

 machs of the sheep, for example, there are from fifteen to twenty of 

 different species and various sizes. Considering that all these ani- 

 malcules are principally composed of fibrin and albumen, we may 

 reckon that the weight of the fifteen to twenty of them existing 

 in every 5 centigrammes of stomachal liquid constitutes nearly the 

 fifth part of the total weight of the liquid in which they live. Now 

 sheep have, on an average, 3 to 5 kilogrammes of food in the first 

 and in the second stomach after an ordinary repast ; the total weight 

 of the animalcules contained in these two stomachs will therefore be 

 the fifth part, or from 600 to 1000 grammes. 



In the third, and especially in the fourth stomach, these animals 

 are dead, and are only to be recognised by the form of their cara- 

 pace, which is then quite empty and transparent. As to those ani- 

 malcules which possess no carapaces, not any trace of them can be 

 detected. 



In the small and in the large intestines we find only some frag- 

 ments of carapaces. 



2. The Horse has seven species of animalcules, in the caecum and 

 the dilated portion of the colon. 



First species. — Form elongated and conical at its anterior part ; 

 head rather indistinct ; the posterior part of the body terminated 

 abruptly ; without a tail ; carapace granulated ; two anterior mem- 

 bers short, articulated, mobile, terminated by natatory filaments ; 

 movements slow and resembling those of the tortoise ; length ith 

 of a millimetre, breadth x\jth. 



Second species. — Form elongated and somewhat flattened ; a di- 

 stinct head ; a granulated carai)ace ; body provided with four articu- 

 lated members on its lateral parts, two of which are anterior and two 

 posterior, all bearing fasciculi of natatory filaments ; circlet of vibra- 

 ting cilia at the posterior part of the body ; movements slow ; length 

 jjjth of a millimetre, breadth jfyth. 



Third species. — Form ovoid ; carapace granulated ; a bundle of vi- 

 brating cilia at the anterior and posterior parts, both on the right and 

 left of the body ; the movements are slow ; length ^^jth of a milli- 

 metre, breadth ri'^th. 



* Ehrenberg, loc. cit, p. 313. 



