6 A CATALOGUE OF THE BRITISH MARINE A.L.G1E 



P. norvccjicum Gom. Coasts of Essex (Clacton) and Dorset 

 (Swanage), Probably not uncommon. 



Tribe II. VAGINARIE^ Gom. 

 Gen. 19. MICROCOLEUS Desinaz. 



M. chthonoplastes Thur. ( = A/, anguiformis). Coasts of Wales 

 (Dolgelly, Point of Ayr), Devon (Sidmouth), Cornwall (Looe), 

 Dorset (Studland), and Northumberland (Berwick, Holy Island) ; 

 Scotland (Firth of Clyde in several places, Montrose, Dunbar). 

 Not uncommon. 



M. tenerrimm Gom. Coast of Devon (Torquay). 



Gen. 20. HYDROCOLEUM Kii.tz. 



H. hjn(jbijaceum Kiitz. a f/enuina Gom. Coasts of Northumber- 

 land (Berwick), Dorset (Wey mouth), and Devon (Sidmouth). Rare. 

 /3 rupestre Kiitz. (Microcoleus nljrescens Thur.). Coasts of North- 

 umberland (Berwick) and Kent (Folkestone). Rare. 



II. fjlutinosum Gom. (= Oscillaria percursa ft marina Kiitz.). 

 Coast of Northumberland (Berwick). Rare. 



Gen. 21. SCHIZOTHRIX Kiitz. 



S. Cresswellii Harv. Coast of Devon (Sidmouth). Very rare. 



S. lardacea Gom. Coast of Devon (Paignton). Rare. 



8. vaginata Gom. Coast of Devon (Sidmouth) ; Scotland (Cuin- 



brae) . 



Subfamily II. HETEROCYSTE^: Hansg. 



Tribe 1. RIVULARIACE^ Rabenh. 

 Subtribe LEPTOCH/ETE^: Borzi. 



Gen. 22. AMPHITHRIX. 

 A. violacea Born. & Flab. Coast of Scotland (fide Rabenhorst). 



Subtribe MASTICHOTBIOHEJE Kiitz. 

 Gen. 23. CALOTHRIX Ag. 



C. confer oicola Ag. Common on the shores of England, Wales, 

 and S. Scotland ; Ireland ; Channel Islands. /? purpurea Born. & 

 Flah. Coasts of Norfolk (Yarmouth) and Sussex (Bognor). Rare. 

 y Zostericola Cm. Coast of Dorset (Weymouth, Swanage). 



C. consociata Born. & Flah. Coast of Norfolk (Cley). Rare. 



C. scopulomm Ag. Not uncommon on the coasts of England, 

 Scotland, and Ireland; Channel Islands (Guernsey). 



C. Contarenii Born. & Flah. Coast of Dorset (Weymouth). Rare. 



C. pulvinata Ag. (= C. hydnoides Harv., C. pannosa Harv., and 

 C. caspitula Harv.). Not uncommon on the shores of England, 

 Scotland, Ireland, and the Channel Islands. 



C. parasitica Thur. Coasts of Dorset (Portland, Swauage) and 

 Cornwall (Porth Cressa, Scilly). Rare. 



C. aruginea Thur. Coasts of Devon (Tor Abbey, Sidmouth), 

 Cornwall (Padstow), Dorset (Swanage), and Northumberland (Ber- 

 wick) ; Scotland (Earlsferry, Fife). Rare. 



