2 FITZGERALD : SHELLS OF HARROGATE AND DLSTRICT. 



Park and FuUwith Stream ; those in this stream have the 

 upper portion of the valves thickly incrusted with mud. 



P.fontinale (Drap.). — One of the commonest and most generally 

 distributed of the genus. Fullwith Stream ; Lake, Ripley 

 Park; Ditch nr. Hampsthwaite; Pond, Ribston Park; Pond, 

 between Nidd Bridge and Knaresborough ; Stone Rings 

 Quarry and Staveley Pond. Burnt Gates (F.T.W.) and 

 Hartwith (F.T.W.). This species has been found in a sub- 

 fossil state on the banks of the river Tutt at Staveley, in 1885. 



P. pusillum (Gmelin). — Generally distributed but not so com- 

 mon as the last named. Pond, Ribston Park ; Staveley Pond; 

 Lake, Ripley Park ; Crimple Stream ; and Pond, Copgrove 

 Park. Rennie Crags and Birstwith (F.T.W.). Found on 

 the banks of the Tutt similar to the last named. 



P. nitidum Jenyns. — Extremely local. Plentiful in Beck 

 near Ripley, (F.T.W. and F.R.F.). 



Unio margaritifer (L.). — This extremely local species occurs 

 sparingly in the river Nidd at Ripley. A specimen which 

 I gave to Mr. Standen, that gentleman said he thought 

 belonged to the var. roissyi. 



Anodonta cygnea (L.). — Fairly common in suitable localities. 

 River Nidd at Ripley ; numerous in the stagnant lake at 

 Plumpton the majority of which are much stunted in 

 growth ; a few in Staveley Pond. 



A. cygnea var. incrassata (Shepp.). — Occurs numerously in 

 the lake at Plumpton. 



A. cygnea var. rostrata Rossm. — Plentiful in Ripley Beck 

 (F.T.W.) and F.R.F.). 



A. anatina (L.). — Not so numerous as A. cygnea but occurs in 

 the same localities ; I have also found shells in the Crimple 

 Beck. 



A. anatina var. complanata Rossm. — This variety occurs 

 sparingly in the lake at Plumpton. 



Dreissena polymorpha (Pallas). — This species is not to be 

 found in any of the rivers etc., of the district, but they are 



J.C, vi., Jan., 18S9. 



