108 MCMURRICH. 
EXPLANATION OF PLATE IX. 
Fic. 1. Surface view of the epithelium of the “midgut” of an adult Avma- 
dillidium. The drawing of this and of the other surface views is made with the 
objective focussed at a high level, so that the cells seem to be distinct from one 
another. (Zeiss, Obj. C., Oc. 2.) 
Fic. 2. Surface view of cell from “midgut” of Armadillidium. ch =optical 
section of the layer of chitin as it passes down between adjacent cells forming 
Carnoy’s “membrane secondaire”; 2 = nuclear membrane; 2#/ = nucleoli. 
(Leitz, Oil-imm. 5.) 
Fic. 3. Surface view of “ midgut ” epithelium from an Armadillidium which 
had fasted for 15 days. This figure shows the abundance of yellowish-green 
granules and also the arrangement of the nuclei which has called forth the theory 
as to their non-sexual conjugation. (Zeiss, C. 2.) 
Fic. 4. Surface view of two cells from the “midgut” of an Armadillidium 
which had fasted 10 days. Showing occurrence of vacuoles (v) and yellowish- 
green granules. The nuclei also show the clear zone of caryolymph within the 
membrane. 
Fic. 5. Section of two cells from adult Armadillidium. ch=\ayer of chiti- 
nous cuticle which remains unstained; ch’ that which stains with iron-lack hema- 
toxylin 4m = basement membrane; # = muscle tissue; VV = nucleus; 72/ = 
nucleolus; v= vacuole; sf= supporting fibres, one of which (s/’) is shown 
broken across. (Zeiss, D. 2.) : 
Fic. 6. Two cells from the “midgut ” epithelium of /dotea robusta, showing 
the appearance of intercellular bridges of protoplasm, the existence of two nuclei 
in what is apparently a single cell and the occurrence of intranuclear vacuoles. 
(Zeiss, D. 2.) 
Fic. 7. Epithelial cell from Armadillidium, showing a portion of the nucleus 
apparently fragmented off. (Zeiss, D. 2.) 
Fic. 8. Epithelial cells from Armadillidium, showing a nucleus which has 
undergone extensive fragmentation, some of the fragments having also wandered 
into an adjoining cell area. (Zeiss, D. 2.) 
Fic. 9. Nucleus of “midgut” cell of an Oviscus which had just left the brood 
pouch. (Leitz, Hom. Imm. 5.) 
Fic. to. Section of a nucleus of a “midgut” cell from an adult Ozzscus, 
showing the nuclear membrane zm and numerous nucleoli (#/) of various sizes. 
The chromatin is in the form of innumerable granules, and at the left side of the 
figure a little of the achromatic network is indicated. (Leitz, Hom. Imm. +5.) 
Fic. 11. Section of cell from the “ midgut ” epithelium of a specimen of Oxéscus 
4mm. in length. It shows the finely reticulate cytoplasm and the supportive 
fibres (sf) projecting up only a short distance from the basement membrane (477). 
The clear space around one end of the nucleus is probably an artifact, and the 
chitinous membrane has been torn away from the surface. (Leitz, Hom. Imm. 7.) 
Fic. 12. Section through one of the large blister-like vacuoles (v) which occur 
abundantly in the “ midgut” of Armadillidium. ch =chitinous membrane ; 6a = 
basement membrane; m#==muscle fibres cut across; /V=nucleus. 
