18 Mr. H. J. Carter on Spongilla fragilis, Leidy, and 



mirabilis, Retzer, is identical with the Epliydatia amphizona 

 described by me cannot be decided from Retzer's description 

 and sketchy figures; a comparison of the types described by 

 Retzer is very desirable. 



p.g. — After I had completed the manuscript of these 

 remarks I received from Dr. Anton Wierzejski, of Cracow, 

 some preparations of the freshwater sponges occurring in 

 Galicia, among which, to my surprise, I also found Spongilla 

 fragilis, Leidy. We must await Dr. Wierzej ski's mono- 

 graph of the Spongillid fauna, which is shortly to appear, for 

 details as to the peculiarities of this freshwater sponge, which 

 is evidently very characteristic of the Palasarctic and Nearctic 

 regions. 



III. — Note on Spongilla fragilis, Leidy, and a neiv Species of 

 Spongilla /row Nova Scotia. By H. J. Caetee, F.R.S. &c. 



With reference to the " P.S." to Prof. F. Vejdovsky's 

 1 Observations ' [supra), I would here remark that Mr. Stuart 

 O. Ridley, F.L.S., of the British Museum, has lately sent me 

 a specimen of Spongilla fragilis, Leidy, as I have described 

 it under the name of S. Lordii, Bk. ('Annals,' Feb. 1881, 

 vol. vii. p. 89), which he discovered in the river Wye, about 

 ten miles above Hereford, England, in August last, growing 

 over the internal surface of a valve of Unio mar gariti ferns. 

 This is the first time that this species of freshwater sponge 

 has been recognized in England. The prolonged aperture of 

 the chitinous coat is not turned to one side, but simply vertical, 

 as in S. Lordii, with a delicate film (for the specimen is dry) 

 of sarcode stretched across its mouth. 



On the 8th August last, too, I received from A. H. MacKay, 

 B.A., B.Sc v of the Pictou Academy, Pictou, a similar speci- 

 men growing over a small branch of wood, together with the 

 variety called " segregata " by Mr. Edward Potts, of Phila- 

 delphia, which Mr. MacKay had found in Macintosh Lake, 

 Nova Scotia. 



Further, on the 26th August following I received another 

 collection of freshwater sponges, obtained by Mr. MacKay 

 from the lakes near Pictou, in Nova Scotia, among which are 

 good-sized specimens of the following : — 



