TAYLOR : MOLLUSCA BETWEEN" ASHTON-UNDER-LYNE AND OLDHAM. 53 



S. ovale (Jeffr.)— In the collection of Mr. E. Collier, of Man- 

 chester, is a fine set marked " Hollinwood canal," and Mr. R. 

 Standen has taken it in this locality, but never any specimens so 

 large as Mr. Collier's. 



S. lacustre (Mull.) — Common in most ponds and ditches in the 

 district, odd specimens of the var. brochoniana occurring at Parkbridge. 

 Some years ago I took a few specimens of a form I took to be var. 

 rotundata from the Bardsley Canal. 



Pisidium amnicum (Mull.) — A few good examples from the 

 Fairbottoms end of the canal, and one specimen from the canal 

 beyond Bardsley Bridge. 



P. fontinale (Drap.) — Not uncommon in a pit at Parkbridge ; 

 occurs in myriads in the pool in Oldham Park. The beautiful var. 

 henslowana may be taken commonly at the Fairbottoms end of the 

 canal. 



P. pusillum (Gm.)— Very fine specimens of this species maybe 

 taken on Fitton Hill, where it is abundant in every pond and ditch ; 

 at Parkbridge and Bardsley the var. obtusalis is very common. 



P. milium (Held.). — Well distributed at Bardsley, Fitton Hill, and 

 Parkbridge, at the latter place it is clean and fine. 



Anodonta cygnea (L.)— Very abundant in the canal at Bardsley, 

 and in pits at Parkbridge. 



A. anatina (L ) — One specimen from the Crime Lake, and another 

 from the canal near the pumping station. 



Dreissensia polymorpha (Pall.)— Not uncommon in the canal 

 adhering to the walls and old boats, and occasionally to the valves 

 of Anodonta cygnea. 



MR. J. T. MARSHALL'S CRITICISMS : AN ANSWER. 

 By G. W. CHASTER. 



(Read before the Society, Jan. 12th, 1898). 



In this Journal for January, 1897 (vol. 8, p. 348), Mr. Marshall 

 severely criticised my remarks upon his supposed new species, 

 Scintilla eddystonia. His comments cannot pass unanswered, and I 

 will deal with them seriatim. 



My error in substituting Scacchia for Scintilla was a mere lapsus 

 calami for which I ask my readers' indulgence. 



Mr. Marshall misquotes my comparison of the shell with Scacchia 

 elliptica, a comparison wholly correct in its original form. 



