94 
Maupasella nova Cepede 
we know very little of the structure and development of the spicule, which 
according to Mobius (1888, p. 104) stains well with osmic acid and safranin. 
(6) According to Fauret-Fremiet (1907, quoted by Cepede, 1910, p. 500) 
the endoplasm of Anoplophrya striata contains mitochondrial bodies. The 
existence of extranuclear chromatin was, on the other hand, mentioned by 
Cepede in Anoplophrya alluri and Herpetophrya astotna Siedlecki. The endo¬ 
plasm of M. nova undoubtedly contains diffused chromatin as it stains usually 
with basic stains. Very often the extranuclear chromatin is more condensed 
into two lateral bands parallel to the macronucleus (PL VI, figs. 8, 10, 11 and 
14). It is possible that the supplementary chromatic body is the result of a 
further stage of condensation of the extranuclear chromatin, produced under 
the influence of some change in the external conditions of life of the ciliate, 
in this case, in the alimentary canal of the host. 
I do not think that a similar supplementary chromatic body has yet been 
described in other ciliates, and I hope that further observations on similar 
abnormalities in other parasitic or free-living species will help to elucidate the 
origin and the nature of this structure. 
REFERENCES. 
Cepede, C. (1910). Recherches sur les Infusoires Astomes. Anatomie, Biologie, Ethologie 
parasitaire, Systematique. Arch, de ZooL Exper. el Gener. 5 e serie, in. 341-609, pis. 
IX-XVII. 
Leger, L. et Duboscq, O. (1904). Notes sur les Infusoires endoparasites. ii, Anoplophrya 
brasili Leger et Duboscq, parasite d 'Audouinia tentaculata. Arch, de Zool. Exper. et 
Gener. 4 e serie, ii. 337-343. 
Mobius (1888). Bruchstiicke einer Infusorienfauna der Kieler Bucht. Arch, fur Naturgescli. 
liv. 81-116. 
Schneider, A. (1892). Dimorphisme nucleaire dans le genre HopUtophrya. Tableites Zoo- 
logiques, n. 211-212, PI. XXXIV. 
EXPLANATION OF PLATE VI. 
MAUPASELLA NOVA CEPEDE. 
o.' supplementary chromatic body; M. macronucleus; m. micronucleus, a. scale of magnifica¬ 
tion for all the figures except fig. 18; b. scale for fig. 18. 
Figs. 1-9 and 15, 16. Different forms of the supplementary chromatic body in M. nova. 
Fig. 10. Elongated form of M. nova showing the chromatic body occupying the posterior portion 
of the ciliate. 
Figs. 11-14 and 17. Dividing stages of M. nova with the supplementary chromatic body localized 
in the posterior individual. 
Fig 18. Micronuclei of M. nova. 
