NAIADACES. 291 
P. Friesii Rupr. P. mucronatus Schrad. P. compressus Sm. 
Native. B. Canals, slow streams. Rather rare. P. June-July. 
First record, Glover, 1829. 
C. Canal near Kirk Hallam, and near Shipley Gate; Renishaw Canal. 
T2. Plentiful in the canal below Osmaston, and near Chaddesden and 
Spondon. 
T3. Canal near Egginton. 
P. pusillus Z. 
Native. B. Ponds, canals, ditches. Frequent. P. June-Aug. 
First record, N.H. Twtb., 1863. 
L. lLathkil Dale, above Alport; pools below Great Shacklow Wood, near 
Ashford. 
G1. Mill pool by Black Brook, Chinley. 
C. Pond at the Hague, Renishaw, Waterfall. Canal near Shipley Gate; 
Loscoe ; Killamarsh; Kirk Hallam; New Stanton; Hardwick; Pebley Pond, 
Barlborough. 
Tl. Osmaston Lake, Smith MSS.! Pond at Old Yeldersley ; Marston-or- 
Dove. 
T2. Canal at Chaddesden and Spondon; in R. Erewash, Sandiacre, the var. 
elongatus, f. Ar. Bennett. 
T3. Pool between Foremark Park and Repton Waste, Purchas, J.B. 
Walton, Nowers. Brook near Bull’s, Repton, Rept. F. d& F. Drakelow. 
P. pectinatus UL. 
Native. B. Rivers, canals, pools. Not uncommon. P. July-Aug. 
First record, Glove7, 1829. 
G2. Canal at Whatstandwell, B. dé: N., J.B. R. Derwent, above Allestree. 
C. R. Rother, near Renishaw, Waterfall. Canal near Chesterfield; Kirk 
Hallam ; Shipley Gate; Beighton; Killamarsh; Hardwick; New Stanton. 
Tl. In the Dove near Tutbury, and Marston; Osmaston Ponds, near 
Ashbourne. 
T2. Breadsall, Whittaker, Phyt. Canal, Borrowash, Painter, Natt. 
Thrumpton Ferry; Trent Lock; Sandiacre. 
T3. Melbourne Pool, Purchas, J.B. Canal near Willington, Gibbs. 
Calke, Bloram. Drakelow, Painter, J.B. Repton, Rept. F. d F. 
P. interruptus Ait. P. flabellatus Bab. 
Native. B. Canals, streams. Rare. P. July-Aug. 
First record, N.H. Tutb., 1863. 
C. Canal near Killamarsh. 
T2. Breadsall, Crewe d: Whittaker ? 
T3. R. Trent at Burton, N.H. Tutb. Willington; Drakelow, Hb. Mason! 
In the Trent by Walton Bridge, K. Trimmer in Nov. Flora. 
