618 
ME. LUBBOCK ON THE GENEEATUCE OEGANS, AND 
chamber occurred only in one of the tubes, and the other one was of nearly equal 
diameter from the testis to the anterior spherical chamber. In one, however, two sides 
were symmetrical, as I have represented in Plate XVII. fig. 31, h. 
The spermatozoa are apparently produced indiscriminately in all parts of the testis. 
They are of an oval form, and are found in rounded masses (Plate XVII. fig. 32). 
I also found in some specimens cells containing filiform spermatozoa; but later in the 
autumn only the oval bodies were present. They are perhaps immature forms ; but 
against this view must be set the fact that the spermatheca of the female contained 
these bodies only. It is, however, very unlikely that they should be altogether difierent 
from the spermatozoa of the so nearly allied genus Ohisimn. 
The tracheae open through orifices at the sides of the second and third abdominal 
segments ; the spiracles lead into a short thick tube, from the end of which arise a 
great number of long thin tracheae, which pass, without giving off many branches, to 
the difierent internal organs. 
Ohisium. — I found, under a piece of wood, in September and October last, five speci- 
mens of Ohisium miisconim, only one of which was a female. It was caught on the 16th 
of October, and had no case of eggs, but the ovary contained eggs in course of develop- 
ment; and much resembled that of Chelifer. The egg-follicles contained sufiicient oil- 
globules to hide the Purkinjean vesicle, though it became visible on the application of 
pressure. The oil-globules were rather even in size, and much smaller than in Chelifer, 
not exceedmg ^ p^^ th of an inch in diameter. 
The testis resembles in form that of Chelifer ; but the spermatozoa are very dissimilar. 
Scattered about in the testis were rounded masses of small cells, which gradually modi- 
fied themselves into spermatozoa. These masses probably arose by the endogenous 
multiplication of small cells within a larger one. The rounded masses were of difierent 
shapes and sizes, and the development of the spermatozoa seemed to be quite independent 
of the size of the mass. The mature spermatozoa had a bright cylindrical head, about 
of an inch in length and very narrow, and a very delicate, scarcely perceptible 
tail (Plate XVII. figs. 33 a, 35). They were quite motionless. The testis also containod 
some oval bodies, resembling in shape those found in Chelifer ; their wall was not, how- 
ever, so distinct, and I did not satisfy myself that they were not merely detached speci- 
mens of the usual small cells. In one specimen I found a number of vesicles of difierent 
sizes, and containing small rod-like bodies (Plate XVII. fig. 34). It is possible, how- 
ever, that in this case I may have had before me some nearly allied species. The 
complemental glands are lobulated, and not spherical as in Chelifer. Each of the 
tubules, also, instead of ending in a crown of glands, terminates in a single, dark, 
club- or egg-shaped mass. 
Of 0. orthodactylmn I found eleven specimens on the under side of the log of wood 
which supplied me also with 0. muscorum. Six of them were males ; the form of the 
testis was like that of the preceding species, but I am not able to speak positively as to 
the spermatozoa. The development of the eggs appeared to be much like that in 
