DENDKOCOMETES PARADOXUS. 359 



23. R. Sand. — ' Etude inoiiof,'rapliique sur le groupe des Infusoires teuta- 



culiferes,' Brussels, 1901. 



24. A. Schneider. — ' Fragments sur les Infusoires. Tablettes zoologiques,' 



vol. i. 



25. H. J. Webber.— " Xenia," ' U.S. Dept. of Agriculture,' Bulletin 22. 



26. E. B. Wilson. — 'The Cell in Development and Inheritance,' 2iid edition, 



1900. 



27. A. Wrzesniowski. — " Beitrage zur Naturgescliichte der Infusorien," 



Z. f. w. Z., vol. xxix, 1S77, p. 255. 



EXPLANATION OF PLATES 17 & 18, 



Illustrating Mr. Sydney J. Hicksou's paper on'^Dendro- 

 cometes paradoxus." 



PLATE 17. 



The figures in this plate, with the exception of 1, 2, and 5, are constructed 

 from a series of drawings of the actual sections of the Dendrocometes. The 

 niicronuclei do not all occur in the same plane as represented, and it is very 

 rarely that the whole of the meganucleus can be seen in one section. The 

 structures have been represented as nearly as possible in their true relative 

 positions. Throughout, M. refers to the meganucleus ; ni., tlie micronuclei ; A., 

 the arms; P., the conjugating process; L. M., limiting membrane. The number 

 at the end of the description of each figure refers to the i)ermanent preparation 

 from which the figure was drawn, Tliese preparations are preserved in the 

 Zoological Laboratory at the Owens College, and may be inspected by qualified 

 zoologists. 



Fig. 1. — Two individuals of Dendrocometes about to conjugate. Each one 

 is protruding a conjugating process (P. P.) and these ultimately meet. In these 

 two individuals the arms are of approximately the same size and degree of 

 branching. Whole mount, No. 14. 



Fig. 2. — Two individuals which have just joined together in conjugation 

 (Stage A). One of them (to the right) has one short arm and two very 

 rudimentary arms (A. 2, A. 3). The other has one large branched arm and two 

 shorter simple arms (see p. 328). The micronuclei are very small, and the 

 meganuclei have undergone very little change (see j). 331). Whole mount. 

 No. 29. 



