346 81. POTAMACER. 
1135 (1186). Ruppia maritima, Linn. 
Provinces 1234-67-910111213141516-18. Native. 
Lat. 50—61. Cornwall, Wight, Kent. — Orkney, Shetland. 
Zones 12 3. Littoral. P. rostellata, Wight to Orkney. 
Census 15 29 43. Ireland 9. British type of distribution. 
Europe spa ita tur - ger fra cha net den got nor swe. 
Russia 6-432. West-asia. Western Siberia. 
Algeria. — America. Columbia. 
1136 (1137). Zannichellia palustris, Linn. 
Provinces 1 to 14--1718. Native. 
Lat. 50—60. Cornwall, Wight, Kent. — Sutherland, Orkney. 
Zones 128. Humber to 150 yards. 
Census 16 28 56. Ireland 9. British type of distribution. 
Europe all, except Lapland and Finmark. 
Russia 6-432. India. Siberia. 
Algeria. Canaries. — America. Columbia. 
1187. Zostera marina, Linn. 
Provinces 1234-67-9101112181415161718. Native. 
Lat. 50—61. Cornwall, Wight, Kent. — Orkney, Shetland. 
Zones 123. Littoral. 
Census 16 28 44. Ireland 9. British type of distribution. 
Europe all, except Finmark. 
Russia - 5 4 8 2. 
— Faroe. Icelaud. Greenland. America. Columbia. 
1137. Zostera nana, Roth. | 
Provinces 12-------- 11-13-1516 [18]. Native. 
Lat. 50—57. Dorset, Wight, Sussex. — Argyle, Forfar? 
Zones 1 2? Littoral. Localities overlooked ? 
Census 6 8 10. Ireland 1. English type of distribution. 
Europe - - - - - fra cha net den got. 
Russia - 5. 
Algeria. 
