162 PRELIMINARY REPORT UPON THE 



C. refracta (Reflexed Cladophora). In rock-pools and on stones. Whitsand Bay. 



Annual. Spring and summer. 

 C. albida (Whitish Cladophora). In rock-pools, and on stones. Bovisand; Caw- 

 sand Bay. Annual. Spring and summer. 

 C. lanosa (Woolly Cladophora). On other algae. Bovisand ; Stoke Bay. Annual. 



Spring and summer. 

 C. uncialh (Inch Cladophora). On rocks partly embedded in sand. Bovisand. 



Annual. Spring and summer. 

 C. arcta (Straight Cladophora). On rocks. Hoe; Bovisand. Annual. Spring 



and summer. 

 C. glaucescens (Glaucous Cladophora). On rocks. Firestone Bay ; Hoe. Annual. 



Spring and summer. 

 C. rupestris (Rock-inhabiting Cladophora). On rocks, and in pools. Very general. 



Annual. Spring and summer. 

 C. Icetevirens (Pale green Cladophora). On rocks. Hoe ; Whitsand Bay. Annual. 



Spring and summer. 

 C.flexuosa (Flexuous Cladophora). On rocks. Mount Batten. Annual. Spring 



and summer. 

 Conferva tortuosa (Twisted Conferva). On rocks around the coast. Annual. 



Summer. 

 C. melagonium (Dark green Conferva). In rock-pools. Whitsand Bay. Annual. 



Summer. 

 C. mrea (Pale green Conferva). On sand-covered rocks. Whitsand Bay. Annual. 



Summer. 



Order XVI. TJlvacese. 



Enter omorpha intestinalis (Intestinal Enteromorpha). On rocks and stones, and in 



rock-pools on beaches. Annual. Summer. 

 E. compressa (Compressed Enteromorpha). On rocks and stones, and in rock-pools 



on beaches. Annual. Summer. 

 E. Linkiana (Link's Enteromorpha). On stones, in the sand. Mount Edgcumbe. 



Annual. Summer. 

 E. erecta (Erect Enteromorpha). On rocks in the sea. Annual. Summer. 

 Ulva latissima (Very broad Ulva). In rock-pools, and on rocks. Annual. 



Summer. 

 U. lactuca (Lettuce Ulva). On rocks. Cawsand Bay ; Bovisand. Annual. 



Summer. 

 U. Lima (Narrow Ulva). In rock-pools, and on rocks. Annual. Summer. 

 Porphyra laciniata (Laciniated Porphyra). On stones and rocks. Annual. 



Summer. 

 P. vulgaris (Common Porphyra). On stones and rocks. Annual. Summer. 

 Bangia fusco-purpurea (Brown-purple Bangia). On rocks. Summer. 

 B. ciliaris (Fringe-like Bangia). On rocks. Mount Batten. Summer. 



Order XVII. Oscillatoriacese. 



Rivularia nitida (Glossy Rivularia). On rocks. Bovisand. Annual. Summer. 



Calothrix confervicola (Conferva Calothrix). On Ceramiam rubrum. Mount Edg- 

 cumbe. Annual. Summer. 



Lyngbya majuscula (Large Lyngbya). Washed up from deep water. Mount Edg- 

 cumbe. 



The following additional names of species observed by Mr. Holmes in Plymouth 

 Sound have been kindly forwarded to me by that gentleman : 

 Mitophyllum venulosum. Torpoint mud bank in June. 

 Arthrocladia villosa. Firestone Bay only. 

 Sporochiiies pedunculata. Torpoint. 

 Gratelonpia dichotoma. Renny Rocks. 

 Nannaria Wiggii. Torpoint. 



