194 INSECTS OF KERGUELEN. [CH. IV 



Ooly a single species of land shell has been so far 

 discovered ; this is Patula hookeri, a species closely allied 

 to Helix diance of S. Helena, to H. quadrata of Juan 

 Fernandez and to H. tessellata. 



Among insects there are on the other hand several 

 peculiar forms. The beetles are in every case without the 

 second pair of wings ; they comprise Ectemnorhinus viridis 

 and a few other species of that genus, Phytosus atriceps 

 and Cannonopsis. A moth with rudimentary wings has 

 been recorded, as well as the peculiar genus (peculiar to 

 the island) Embryonopsis halticella. The Diptera do not 

 show the same rudimentary character of the wings that is 

 met with among the Coleoptera; there are however six 

 peculiar genera with a species apiece and an introduced 

 form. 



The spiders of the island are represented by two 

 peculiar genera, Myro and Poecilophycis, of which the 

 latter is so aberrant that the Rev. O. Pickard-Cambridge 

 has felt it necessary to form an entirely new family for its 

 reception. Among the fresh-water invertebrates, which 

 are not very numerous, there are no peculiar genera; but 

 all the species are, so far as we know at present, peculiar ; 

 these comprise species of the two Crustacean groups 

 Cladocera and Copepoda, and an Enchytra3id (unidenti- 

 fied). One terrestrial Annelid has been found and 

 described by Lankester as an Acanthodrilus 1 (A. Tcergue- 

 lenensis) ; this is a species peculiar to the island, unless 

 the Acantliodrilus of the Crozets be the same ; but the 



1 Phil. Trans. Vol. 168, Extra Volume. 



