166 



clear golden yellow colour, with a diffuse minium-red pigment on the back, forming- 

 slight ramifications on each side of the segments. Length of adult female 4 mm. 



Remarks.— -This species was established in the year 1879 by Mr. Budde- 

 Lund from some specimens found in a collection of Trichoniscus pusillus from 

 the neighbourhood of Copenhagen. The specific name is somewhat inappropriate, 

 since it is only S2i>ecimens that have been preserved in alcohol for some time that ex- 

 hibit a white colour, whereas the animal in a fresh state is distinguished by a very pro- 

 nounced golden yellow hue, changing to reddish orange. Mr. Budde-Lund has identified 

 the Trichoniscus Leycligi of Weber with the present species; but this seems to 

 me inadmissible, since Dr. Weber expressly indicates the colour of the living ani- 

 mal to be a pure white, and, moreover, absolutely denies the existence of eyes, 

 which in the present species are easily observable both in fresh and preserved 

 specimens. Nor does the habitus figure he gives of his form agree exactly with 

 the present species, and the detail-figures subsequently given by that author also 

 exhibit some well-marked differences, while yet showing the 2 species to be very 

 nearly allied. 



Occurrence. — I have met with this form in 3 different places in the 

 neighbourhood of Christiania, but in none of them in any abundance. In all 3 

 localities it was found on the lower side of stones deeply imbedded in the soft 

 ground. Its motions are very slow, and it is thereby markedly distinguished 

 from the species of the genus Trichoniscus, which are rather active animals. During 

 its slow creeping it winds its flexible body about in a most peculiar manner, and 

 may thus at first sight easily be mistaken for a little worm. 



Distribution. — Denmark. 



Gen. 3. HaplOphthalmUS, Schobl, 1860. 



Generic Characters. — Body oblong, moderately convex, sculptured dorsally with 

 more or less distinct longitudinal ribs. Oephalon with the front triangularly produced, 

 though scarcely defined from the epistome, lateral lobes rather large. Side-plates of 

 mesosome lamellarly expanded, discontiguous. Metasome not abruptly contracted 

 epimeral plates of the 2 anterior segments small, those of the 3 succeding ones well de- 

 veloped, laminar; last segment of a similar shape to that in the 2 preceding- 

 genera. Eyes very small, simple, subdorsal. Antennulse and antennas much as 



