V. 



Earthworms and Oceanic Islands. 



IT is impossible in the present state of our knowledge to write any- 

 thing like an exhaustive article with the above heading ; but we 

 are in possession of a certain number of facts which have never, 

 so far as I am aware, been put together in a connected form. It may 

 be of some little interest to do this, as the group of earthworms is one 

 which is in many ways the most suitable for use in attacking the 

 problems of geographical distribution. It will be convenient, perhaps, 

 to commence with an enumeration of the bare facts seriatim, and to 

 follow this with a general comparison of them. We shall, therefore, 

 take those truly oceanic islands from which earthworms have been 

 brought one by one. 



The Bermudas. Onychochata windlei, Pontodrilus bermudensis, 



Perichaeta bermudensis. 

 Teneriffe. Microscolex modestus, Allurus tetraedrus. 

 The Azores. Allobophora eiseni, A. nordenskioldi, A. trape- 



zoides, A. chlorotica, A. putris, Perichaeta indica. 

 St. Helena. Eudrilus eugeniae, (Lumbricus helenae, L. josephinse, 



L. hortensiae, Perichaeta sanctae-helenae). 

 Madeira. (Lumbricus vineti.) 

 Fernando Noronha. Pontoscolex corethrurus. 

 South Georgia. Acanthodrilus georgianus. 

 Marion Island. Acanthodrilus kerguelarum. 

 Kerguelen. Acanthodrilus kerguelarum. 

 Mauritius. P. mauritiana, Per(cha , ta robusta, (P. mauritii). 

 Rodriguez. (Perichaeta rodericensis.) 

 Seychelles. Megascolex armatus. 

 Marquesas. Megascolex albidi/s. 

 Upolu. Perichata upoluensis. 

 Tahiti. Perichceta grubei, P. novarcp, (Lumbricus tahitanus, Phere- 



tima montana). 

 Pelew. Fletcherodrilus unicus. 

 Fiji. Dichogaster damonis, Perichaeta vitiensis, (P. subquadrangu- 



laris). 

 Hawaii. Perichceta h away ana, Pontoscolex hawaiensis, (P. corticis, 

 Hypogaeon havaicus). Limnodrilus sp. 



Tonga. (Lumbricus tongaensis.) 



K 2 



