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that the "testes are formed by a cluster of elongated . . . csecal tubes;" 

 and this opinion has been generally adopted, though from the structure 

 and contents of these tubes it is evident that they are rather to be 

 regarded as accessory glands. Leydig found among these tubes one 

 longer than the rest, and described this, which is in fact the ductus 

 ejaculatorius, as the true testis. The true testis, however, had been 

 misunderstood, but not overlooked. It is described by Treviranus, 

 Tulk, Leydig, and others, and being present only in the male sex, 

 was supposed by all to be a portion of the generative organs, though 

 they were not able to trace its connexion with the penis. It is a 

 large V-shaped tube, which lies transversely across the abdomen ; at 

 each end it dwindles into a very fine tube, which passes, on each 

 side, round the tracheal trunks close to the spiracles, and then 

 the two approaching one another, unite in the centre of the body and 

 fall into the long winding ductus ejaculatorius. Thus it will be seen 

 that the generative organs of the male Phalangidse are formed on 

 exactly the same type as those of the females. 



In Chelifer and Obisium the ovary is a simple tube, on each side 

 of which the egg-follicles are produced. In each specimen there are 

 two sets of eggs in very different stages of development, and it would 

 appear that thirty or forty come to maturity at once. In the early 

 part of the autumn I found four or five specimens, with an egg-capsule 

 attached to the underside of the abdomen. These egg- capsules, how- 

 ever, only contained seventeen or eighteen eggs. Moreover, in these 

 specimens I found neither a testis nor an ordinary ovary, but a large 

 body consisting of about thirty follicles opening into a common cavity, 

 and full of oil-globules. The eggs in the egg-capsule were in several 

 cases undergoing segmentation. 



The males of Chelifer appear to be about as numerous as the 

 females. The testis consists of a median and two lateral tubes, which 

 are united together by three transverse branches. It is therefore 

 much like that of the true Scorpions. The spermatozoa in Obisium 

 have a small head and a long tail, while those of Chelifer are oval 

 bodies. These oval bodies may be immature forms only, but I never 

 found any further stage of development in the spermatheca of the 

 female. 



The ovary of Petrobius consists of seven short egg-tubes ; each of 

 which in September contained three eggs, with more or less darkened 



