26 ARKIV FÖR ZOOLOGI. BAND 2. N:0 8. 



smaller and more acute in the male than in the female; in 

 S. crassicaiidatiis the lower side of some of the joints in the 

 palps differs much as to equipment with processes in the 

 sexes; in S. insignis n. sp. the palps of the male are about 

 three and a half times longer than those of the female. As 

 to size and colour the sexes differ at most only a little 

 from each other. 



1 Sperniatophores. — As far as we know, the act of co- 

 pulation has never been observed in any animal belonging to 

 the Uropygi. In a single, small but probably adult, female of 

 Schizomus latipes n. sp. we fonnd a large and very curious 

 thing firmly attached to the lower surface of abdomen, con- 

 cealing the genital apertnre and the adjacent portion of 

 second, third and fourth sternite. Seen from the side (Pl. 4., 

 fig. Ig) it resembles an oblong flattened sac with a freely 

 protruding bow. Seen from below (Pl. 4., fig. Ih) we per- 

 ceive two ovate flattened sacs placed symmetrically at a short 

 distance from each other parallel with the mesial line; from 

 the anterior end of each sac proceeds a thick thread forming 

 a bow directed inwards, backwards and downwards; its posterior 

 end is fused with the inner margin of the same sac a little in 

 front of its posterior margin. In the major portion of their 

 length these two bows lie so close that the}^ seem to be at 

 least pasted together, but by an investigation under the 

 dissecting microscope it was observed that the threads only 

 touch each other. The sacs ha ve everywhere a thick wall; 

 this wall and the bows are vitreous, looking rather as the 

 wall of a spermatophore in Copepoda; the contents of the 

 sacs has a light greyish tone, but no spermatozoa could be 

 discerned. Such sacs were found only on one specimen, and 

 this had been sent to us by Mr. E. Simon, but we did not 

 ask his permission to remove the sacs, fearing that it would 

 be impossible to see more on them after their removal than 

 we had already observed. We are unable to decide the 

 question whether these sacs are spermatophores or bodies of 

 other origin; but their regular symmetrical arrangement on 

 the place mentioned and the quality of their wall induce us 

 to guess that they might be spermatophores. In spite of the 

 meagre result we preferred to describe and figure these sacs 

 instead of passing them över in silence. 



