BY AVILLIAM A. HASWELL. 341 



own, very delicate and ti-ansparent, made up of several layers — the 

 mouth opening on the outer surface of the tube of the Cerianthus. 

 The Cerianthus tubes sometimes come up empty, as we should 

 naturally expect — the anemone having dropped out ; but a suffi- 

 cient number of occupied tubes are found to show that under 

 ordinary circumstances a living Cerianthus occupies the interior 

 of the tube, and a community of Phorones live in its wall. This 

 species of Phoronis is never found anywhere else ; and the species 

 of Cerianthus is very rarely found without the Phorones. 



1 had long since observed two kinds of Actinotrocha on the surface 

 of Port Jackson, differing considerably not only in size but in other 

 respects ; but the second adult form was only found recently. It 

 was dredged some weeks ago in considerable abundance in the 

 same locality as that inhabited by the large species, growing 

 thickly over empty mussel shells. This second species is no 

 larger than the European kinds, being only about a half to three- 

 quarters of an inch in length. The tubes are membranaceous, 

 tough and flexible, almost hyaline, closely twisted together. On 

 a comparison with the descriptions of the European species I can 

 find hardly any point of any importance to distinguish the Port 

 Jackson form from P. psammophila of Cori from Messina ; the 

 number of tentacles is greater (about 100), and there are no sand- 

 grains affixed to the tubes ; but these are perhaps not constant 

 diffiirences. 



II. An Alloioccele Turbellarian inhabiting the underground 

 waters of Canterbury, New Zealand. 

 The Alloioccele Turbellaria hitherto known are all, with only 

 two exceptions, inhabitants of the sea. The exceptions are 

 Plagiostoma Lemani, Forel et Duplessis, and Monotus meso- 

 pharynx, Diesing — the former found at depths of 2 to 300 metres 

 in various of the Swiss lakes, the latter — the position of which is, 

 however, very doubtful — at the Cape of Good Hope.* I'he occur- 

 rence, therefore, of a fresh- water representative of this group in 

 New Zealand is of considerable interest. 



(1) Von Graff, " Monographie der Turbellarien," I. Rhabdoccelida,. 



