140 Descriptions of Preparations. 



appendage of the head^ and the constant intercalation of new 

 segrnents formed in the same way between the head and the 

 earlier formed segments. See also Van Beneden^ Memoire 

 sur les Vers Intestinaux, 1858, pp. 235-251; and for an 

 account of similar processes observed in the Polj'chaetaj see 

 Huxley, Edinburgh New Phil. Journ., Jan. 1855; Ehlers, 

 Die Borstenwurmer, Bd. i. 207 seqq., ibiqtie citata ; and for 

 the Oligochaeta, see Lankester, Linn. Soc. Trans, xxvi., 

 Quart. Journ. Microsc. Science, 1869. 



For a special history of this Tapeworm, Caennrus Cerelralis s. 

 Cuniculi, see Van Beneden, I. c, pp. 146-148; Cobbold, I.e., 

 p. 116; Gamgee, Fifth Report of the Medical Officer of the 

 Privy Council, 1862, pp. 234-237; Thudichum, Seventh Re- 

 port of the Medical Officer of the Privy Council, ] 865, p. 335; 

 Numan, Verhandelingen der eerste Klasse van het Koninklijk. 

 Nederlandsche Instituut, 1850. where many figures, micro- 

 scopic and other, are given of this animal. 



For the classificatory relations of the Platyelminthes and the Hiru- 

 dineae, see Grube, Die Familien der Anneliden, 1851, pp. 3-8 ; 

 Schneider, Monographic der Nematoden, i(S66, p. 329; Leuc- 

 kart, Die Menschlichen Parasiten, pp. 156, 157 ; Claparede, 

 Bibliotheque Universelle, tom. xxii. Bull. Sci., pp. '^^6-'^^^, 

 1S65; Ann. and Mag. Nat. Hist. Ser. iii. xvii., 1866, p. 100; 

 and M. de Quatrefages, p. 108; Claparede, vol. xx., 1867, 

 p. 337 ; Van Beneden, Turbellaries, p. 48, i860. 



For the structure of the integument in the Platyelminthes, see 

 Leuckart, I. c, pp. 459, 645 ; Schneider, I. c, ■t^'^'^. 



For their 'parenchymatous^ or ' stertlminthous' character, see 

 Leuckart, l. c, pp. 157, 666, 713; and for the presence in 

 the pseud-haemal vessels of true corpusculated blood, such as 

 is ordinarily found only in the perivisceral cavity, see Leuc- 

 kart, I. c, p. 670; and Dyster, Linn. Soc. Trans., xxii., p. 254, 

 1858. 



