172 



Transactions of tlie Society. 



Trochosphsera sequatorialis ; & male, T. 

 Megalotrocha hullata (n. sp.) T. 

 Gonochilus vohox. 

 Philodina citrina. 

 Eotifer vulgaris. 



„ tardus. 

 Actinurus Neptunius. 

 Asplanchna Brightu:ellu. 



„ Ehheshornii. 



Polyarthra platyptera. 

 Triarthra longiseta. 

 Notops clamdatns. 

 Nutommata centrura. 

 Copeus pachyurus. 

 Furcularia longiseta. 

 Diglena hiraphis. 

 Mastigocerca stylata. 

 Rattulus lunaris. 



Coeloprts tenuior. 

 Dmocharis pocillum. 



„ triremis (n. sp.) "W. 



Scaridium longicaudum. 



„ eudactylotum. 



Diplois Damesise. 

 Euchlanis triquetra (var.). 

 Cathypna luna. 

 Monostyla lunaris. 

 Colurus amhlytelus. ^ 

 Metopidia solidns. 

 Pterodina patina. 

 Brachionus Baker i. 

 Orthurus militaris. 



„ apertus (n. sp.) T. 



Anurs&a aculeata. 



„ cochlearis. 



Pedalion mirum. 



Who would ever have imagined that in a sea-girt continent, at 

 •the opposite side of the globe, in a land whose fauna and flora are so 

 strange as those of Australia, we should find that forty-five out of 

 fifty-two recorded species were British, and that, of the remaining 

 seven, one (Floscularia Millsii) had a habitat in the United States ? 



The United States, too, Jamaica, and Ceylon, all reproduce the 

 same phenomenon, though on a reduced scale, so that the question at 

 once arises, how could these minute creatures, who are inhabitants of 

 lakes, ponds, ditches, and sea-shore pools, contrive to spread them- 

 selves so widely over the earth ? Take, for instance, the case of 

 Asjolanchna Ebhesbornii, which till quite lately had but one known 

 habitat, viz. a small duck-pond in a vicarage garden in Wiltshire. 

 The very same animal has been found by Mr. Whitelegge in the 

 Botanical Gardens at Sydney, New South Wales. No doubt in time 

 it will be found elsewhere also ; but how, or when, did it pass from 

 the one spot to the other ? 



That extraordinary spherical Eotiferon, too, TroehospJisera sequa- 

 torialis, discovered by Dr. C. Semper in the Philippine Islands, had, 

 for the last thirty years, no other known habitat ; yet both sexes have 

 been found, quite lately, by Mr. Gunson Thorpe, in the Fern-island 

 pond of the Botanical Gardens of Brisbane. 



Again, there is the strange Floscule F. Millsii, a Eotiferon appa- 

 rently linking together the genera Floscularia and Stephanoceros, 

 and which has been found almost simultaneously by Mr. Whitelegge 

 at Sydney and Dr. Kellicott at Ontario; the possibility of its 

 journeying between two such points seems quite as hopeless as that 

 of Asplanchna Ebheshornii's passing from New South Wales to 

 Wiltshire. 



And such cases are numerous. How did Hydatina senta and 

 Brachionus pala get to New Zealand? or Notops brachionus, and 

 Rotifer vulgaris to the top of Adam's Peak and the Pampas of La 

 Plata ? Again, there is Pedalio7i mirum ; since I first found it in a 

 pond at the top of Nightingale Valley at Clifton, it has been met 

 with in four or five other places in England, including a warm-water 



