C. T. HUDSON ON THE ROTIFERS. 165 



of division followed the classification of Dujardin, who, though 

 an admirable critic, had done very little original work. 

 (2) Rotifer citrinus — having the property of reviving again after 

 being dried ; the process of covering themselves with a gelatinous 

 coating to resist drought, as explained by Mr. Hy. Davis — was 

 referred to. (3) Actinurus Neptunius — one of the rarer Philodines. 

 (4) Hydatina senta. (5) Some curious parasites found in the 

 stomach of Hydatina. (6) Notommata aurita — its method of 

 capturing and devouring Vorticellse described. (7) Trochosph&ra 

 cequatorialis — rare foreign form. (8) Pterodina valvata. (9) 

 Euchlanis triquetra. (10) Lacinularia socialis. Dr. Hudson 

 remarked that it had been formerly held by Professor Huxley that 

 Rotifers were the permanent forms of Echinoderm Larvse. He 

 need not trouble the meeting by following out the subject further 

 than to say that the Professor's argument partly depended on the 

 assumption that the Rotifers could be divided into a monoecious and 

 a dioecious group, and that Lacinularia socialis had been placed in 

 the former. It was probable that Professor Huxley had since seen 

 reason for modifying this conclusion, because male Rotifers had now 

 been discovered in all the great groups, with one exception ; and he 

 himself (Dr. H.) had had the good fortune to discover, among 

 several others, that of Lacinularia. As the Quekett Club was a 

 working society, these missing males might be looked for by the 

 members. They were those of the Philodines — common Rotifers 

 that might be found in every gutter — and yet no one had yet seen 

 and recognised their males. Suppose the Q.M.C. should take it in 

 hand! (11) The male of Lacinularia socialis. (12) A splancJma 

 (male and female). (13) (Ecistes. (14) A group of CEcistes 

 longicornis. (15) Limnias — specimen procured at Nausea. (16) 

 Limnias — peculiar form. (17) Limnias annulatus — rare species. 

 (18) Cephalosiphon — peculiarity mentioned of having its one large 

 antenna on the wrong side of the body. (19) Diagram of a plant — 

 Ranunculus aquatilis — to show the application of the method of 

 illustration to botanical subjects. (20) Portion of plant, with red 

 water mites ; also to show application of this method of illustration. 

 (21) Group — with Melicerta. (22) Melicerta ringens, in various 

 positions ; also small one commencing to make tube. (23) Meli- 

 certa tubicolaria — placed in a distinct genus by Ehrenberg. (24) 

 Floscularia campanulata — a most beautiful object upon a dark 

 ground. Its method of capturing its prey was described, an 



