STUDIES OX THE EOTOPArvASITIC TREMATODES OP .TATAX. 1 ] ^ 



nioiiihranc and consisrinci' of tall, ]irismatic cells, each with n small 

 Riirleus near the hase (IM. XVIII, tig. 2 ; IM. XIX, ti- 7). These 

 iiiicici nre sj)lieri<"il ami vcsicalar, hut stains well, and eaeli contains a 

 sinu'lt^ dot-like nucleolus. \n ('iiUcolijJc ihe l)ouiid:ii-ies of the cells are 

 disrinct ; hut in MonocDiijli' they lu'Coine indistincr towanls the free 

 surface of tlie cells. The protoplasm of the cell is tinelv granulär and 

 stains ;i heautiful pui'plish hlue with Ivleinenherg's haematoxvlin. 

 In the specimens n( MonocnfiiJt' examined hy me the free borders of the 

 cells remaine(l almost totally unstained and presented a somewhat 

 strino'V appearance, as if a layer had l)een artificially formed l)y the 

 sticking t(~>gether of closely aggregated tine cilia (PI. XVIII, fig. i^). 

 S t.- Il em}''' considers what I h-a\e regarded as the epithelium of the 

 ootvp as of the naruj'e of a connectiw tissue and calls it ••cuticle"; 

 and in support of his \ iew lu; mentions the fict that although the wall 

 of the ootvp shows a certain tendency towards its external side (^i. e. 

 the side turned towards rhe mesenchvma) to break up into irregular 

 ])risms, the lines of separ-ition do not correspond witli the distribution 

 of the nuclei. From his statements elsewhere I ^'iitlier that the author 

 (hx's not mean h\ '• luie certaine tendance à se dissocier en ])i'ismes 

 irr('L;"uliers " that lie has actiialh' ti'ied to se])a'rate these ])i'isms liv 

 maceration oi* oilier means, hut I l)elie\'e he is here speaking 

 <^f the lines which I ha\'e regardée] as cell-boundaries. If so, it is to 

 be observed that exen in the case of a true ei)ithelium the boundaries 

 do not always seem in cross-sections to correspond exactly Avith the 

 distribution «^f the luiclei, as actually for exnm])le, in tlio intestine of 

 'MotiocottiJc and Cidicotiih'. St.-Iîemy-' a<lmils that "■ il est vrai- 

 semlde (pie d;ins le jeiuie Age, il y axait là des cellules ;"' l)ut he thinks 

 "que cette fragmentation ne corres[)ond ])as à leurs limites.'" Tt is 



1). St.-Remy— /. c pp. 10, 2(5, 33. 

 2 ). /. c. p. 2r,. 



