The Somatic Nuclei of Certain Cestodes. 
ß y 
ß. T. Young 
With plates V and VI. 
In a recent paper, Young (1908), I have called attention to the 
probable de novo or spontaneous origin of nnclei and their physiological, 
rather than morpliological character in Taenia serrata and its larva, 
Cysticercus pisiformis. 
These conclusions are supported by a further study of several Ces- 
todes, the results of which are presented in the following paper. 
The species employed were: Moniezia planissima, Thysanosoma 
actinoides, Taenia er assicollis, Taenia serrata, Anoplocephala sp. 1 ), Crosso- 
bothrium laciniatum Khynchobothrium bulbifer, Coenurus serialis, Tetra- 
rhynchus crenacolle and two unidentified larvae from Evotomys gapperi 
galei and Cynoscion regalis, thus including species from the Taeniidae, 
Phyllobothriidae and Rhynchobothriidae. 
The following table gives the methods of fixation and staining of 
each species. For the sake of brevitv I shall indicate the different fixa- 
tives employed by letters, and the stains by Roman numerals. The first 
column of the table gives the name of the species, the second column the 
method of fixation, and the third column the stain. The following are 
the fixatives employed: — 
A) Equal parts of Chloroform, glacial acetic acid and saturated 
alcoholic solution of mercuric cliloride. 
B) Flemming’s strong chrom-aceto-osmic mixture. 
C) Saturated solution of picric acid in 5% formalin. 
D) Graf’s chrom-oxalic acid. 
') This material was obtained from Evotomys gappen galei, Microtus pennsyl- 
vanicus modestus and Peromyscus sp. Specific determinations are at present impossible. 
