438 THOS. H. MONTGOMERY jr., 
of parenchym (Vas.S) of a fibrous nature (the parenchym in the form 
of long spindle-shaped cells), quite similar to those which form the 
sheath of the eye. 
Literature on the body cavities, mesenteries, and 
parenchym. Vırnor (1874, 1887, and other papers) considers the 
“parenchyme” to be an embryonic mesodermal tissue filling the whole 
“blastocoele”; that it becomes absorbed in the development of the 
ovaries and testes and so decreases in amount during the development. 
In another paper (1891) he considers the parenchym to constitute an 
alimentary reserve; that all the adult body cavities are formed by 
“régression” of the parenchym; and that “Il n’existe chez les Gordius 
adultes ni coelome, ni rien que l’on puisse assimiler aux mésentères 
des vers coelomates”. VEJDovskY (1886, 1888, 1894), on the con- 
trary, holds that the parenchym, “Zellkörper”, is not an embryonic 
reserve tissue but reaches its greatest development in the adult; that 
in the immature condition the body cavity (“Cölom”) is large, and 
lined by a “splanchnisches” and “somatisches” epithelium, as in An- 
nelida. He is the discoverer of the “Rückencanal”, and describes and 
compares the mesenteries with those of Annelida. Under the name 
“Cölom” he understands what I have called the “lateral body cavities”. 
All the facts he reviews as a basis for these comparisons I need not 
mention here, since they are based mainly upon the embryonic changes, 
‚and my paper deals essentially with the adult anatomy. VEJDOVSKY 
regards the “Zellgewebe” not as a connected whole, but as consisting 
of densely crowded “Lymphoidzellen”, on the basis of an experiment, 
where on isolation of these cells they appeared amoeboid; in other 
words, he did not find any dense intercellular substance, but regards 
them as free cells, and hence opposes the usage of the term ‘“paren- 
chym”. According to him, the “Ovarien” in this growth push the 
splanchnic against the somatic peritoneum, so that at first they do 
not lie within the “Cölom”; but that the ova later come to occupy 
a virtually intracoelomic position, by reason of the disappearance of 
the splanchnic layer. 
von Linstow (1889) also uses the term “Zellkörper” for the 
parenchym and finds the cells to be arranged in “segmented” trans- 
verse rows; this segmentation he regards as a point of similarity 
with the Annelida, disregarding the fact that these animals have no 
such tissue in their organisation. The “Leibeshöhle” he limits to the 
periintestinal cavity, considering all the other cavities as part of the 
reproductive systems, 
