380 NAIADACEj^E. IPotamoffeton.. 



P. Friesii Eupr. 



Districts — II. VI. VII. VIII. IX. 



Lat. 62°-53i°. South and West, chiefly. 



Lowland. Lakes, ponds, and ditches ; very rare. 



II. Youghal bog, Cork, 1896; Phillips Sf R.W. S.—Yl. Pond 

 near Foynes, Co. Limerick : Stewart i8go. Lough Derg : Linton 

 1886. — VII. Lough Ennel, and at Lord Longford's landing stage,. 

 Lough Derevaragh : Linton i8q6. — VIII. Eoundstone, Gralway ; 

 Linton 1886. — IX. In Claremorris Lake and adjoining ditches^ 

 Mayo : Mwrshall i8g6. 



14. P. pusillus Linn. — Small Pond-weed. 



Districts I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 51^°-55i°. Thi-oughout Ireland. Type, British. 



Pools, ditches, lakes, &c. ; frequent. Fl. June-July. 



Sea-level in N. Antrim and in Kerry. To 1150 ft. ia DoTmi 

 and to 1600 ft. in Keny {Sort). 



15. P. pectlnatus Linn. — Fennel-leaved Pond-weed. 



Districts I. II. III. IV. V. VI. VII. VIII. IX. X. XI. XII. 



Lat. 51i°-55i. Throughout Ireland. Type, British. 



Lowland. Ditches, pools, streams, and lakes, especially near 

 the sea ; frequent. Fl. June-July. 



P.flabellatus Bab. 



P. inierruptus Kit. 



Districts I. II. — IV. V. — VII. — IX. — — — 

 Lat. 51J°-54i°- Southern half of Ireland, chiefly. Local and rai-e. 

 I. Castlegregory Lake, &c., Kerry : R. W. 8. i88g. Clonakilty ; 

 and — II. Near Toughal : AUin's Corlc. Plentiful at Ballycotton 

 ( Gm-roll) ; in the river Puncheon near Permoy, Cork {T. Chandlee) ; 

 in the Suir near Clonmel {Moore) : Cyl.—IY. Ditches on the south 

 side of "Wexford Harbour, and frequent about Macmine Junction ; 

 Eosslare ; Churchtown and Courtown, Wexford : Marshall i8gb ^ 

 i8g8.—Y. In the canal near Straflan, Kildare {J. Douglas) : Cyh.— 

 VII. and IX. In the Shannon near Athlone : B. Sf V. 188'j. — 

 IX. Glencar Lake, Sligo : B.SfV. 1883. 



