MALK OKGANS OF GKNKHATION. 209 



of very fine vessels, which, upon opening the insect, was covered by the 

 dorsal portion of the posterior end of the intestinal canal. Upon closer 

 inspection I found that all these vessels were merely the branches of a 

 main stem that was furcated, which was the case also with each branch, 

 and I thus found eight successive furcations. The terminal ends I could 

 not distinctly perceive, but they are probably loose. In Lamia cedilis, 

 at least, where only one furcated vessel is found on each side, the 

 branches are free, but unequal, the exterior one being shorter, and the 

 interior longer, the stem emptying itself into the sperm duct (PI. XXX. 

 f. 11.) ; and it is the same in Callichroma moschatum. 



Where there are two pairs of appendages, they display the same 

 forms. In Ascalaphus Italicus they are, according to Hegetschweiler, 

 four unequal, pear-shaped bladders, which empty themselves into the 

 sperm duct : the smaller ones have besides a superior vascular 

 appendage. According to Posselt *, two pairs of vascular appendages 

 are found in Geotrupes stercorarius ; to Hegetschweiler, in Clerux 

 alvearius ; to Gade, in Tenebrio molitor ; and also in Blaps morlisaga, 

 Meloe and Lytta, in which they are short, but of unequal length, and 

 one pair empties itself upon the upper surface, and the other pair upon 

 the under surface, into the sperm bladder f. In Hydrophilus, there 

 are also two pairs of unequal appendages ; the inner ones are shorter 

 but broader, the exterior ones longer, and they furcate into two equal 

 branches : both empty themselves between the sperm ducts, the testes, 

 and the epidydimis, into the end of the common ductus ejaculatorius. 

 (PI. XXX. f. 10. b. b. and bb. bb.). 



In Notonecta glauca there are even four pairs of equal vascular 

 appendages; and in Buprestis mariana, according to Gade J, there 

 are two pairs of vesicular ones and two pairs of vascular ones together. 

 One pair of the first is very small, the other longer, clavate, and bent : 

 also one pair of the vessels is bag-shaped, and the other filiform and 

 tolerably long. All unite at one spot in the ductus ejaculatorius, into 

 which also the sperm ducts, but at some little distance further back- 

 wards, empty themselves. 



* Bcitrage zur Anatomic der Insekten, Pt. 1. f. 1G. 



f Brandt and Ratzeburg Arzeneithiere, vol. ii. 4 Pt. PI. XIX. f. 13. 



t Nova Acta Phys. Med., vol. xi. p. 331. 



