Dr. A. Krohn on the Male Generative Organs 0/ Phalangium. 149 



XVIII. — On the Male Generative Organs of Phalangium. 

 By Dr. A. Krohn*. 



From dissections which I have very recently made, it appears 

 that the notions of Treviranus and Tulk as to the male sexual 

 apparatus of Phalangium still generally adopted require to be 

 essentially modified. The principal question here is as to the 

 still unexplained signification of a gland-like organ furnished 

 with two efferent ducts, which is situated in the abdomen upon 

 the lower wall of the alimentary tube, occurs only in the male, 

 and appears, as Treviranus asserts, to have some connexion with 

 the other parts of generation. 



My investigations have proved that the above-mentioned organ 

 is the testis ; so that the pair of glands consisting of ramified 

 lobes or cseca situated in the anterior part of the abdomen, to 

 which Treviranus and Tulk ascribe the function of preparing 

 the seminal fluid, have quite a different destination. 



When the abdomen is opened from the ventral surface, the 

 testis falls out, and appears, after the removal of the adherent 

 fatty body, as a sausage- shaped greatly curved organ f of a dull 

 white colour, bridged over by the two retractor muscles of the 

 penis (fig., a). From the extremity of each of its horns (which 



The male generative apparatus of the second species of Phalangium men- 

 tioned in the text, without the accessory glands. Its component parts are 

 removed from their natural position in order to show their connexion. 



a. The Testis, b b. Vasa efferentia. c. Coil of the vas deferens. 

 d. Dilated portion of the vas deferens, e. Sheath of the penis, with 

 the penis (/) within it. g g. Retractors of the penis. 



are directed forwards, and do not reach to the part where the 

 two breathing-orifices or stigmata occur on the outer surface 



* Translated by W. S. Dallas, F.L.S., &c, from Wiegmann's Archiv, 

 1865, pp. 41-48. 



t" The sigmoid or zigzag form ascribed to this organ by Treviranus and 

 Tulk is probably only a consequence of injury or displacement during 

 dissection. 



