348 B. G. Eaton — Algoi from Eastport, Maine. 



38. Ptilota elegans, Bonnemaison. 



Tide-pools ou Campobello Island, at Herring Cove. Little Green 

 Island near Grand Manan, 3Ir. Isham. 



39. Callithamnion Americanum, Harvey. 



40. Callithamnion Pylaisaei, Montague. 



41. Callithamnion floccosum, Agardh. 



These three species of Callithamnion were found parasitic on 

 Ptilota serrata at Dog Island by Mr. Prudden, and Nos. 40 and 41 

 were found growing on muscle-shells among the wharves by Prof. 

 Verrill. 



42. Callithamnion Rothii, 'Ljngbje. 



Growing in the piles of the wharves near low-water-mark, and on 

 the rocks at Dog Island and Grand Manan, exposed at low-water, 

 Prof. Verrill and Mr. Prudden. 



43. Porphyra vulgaris, Agardh. 



Very common between tide-marks, growing chiefly on other algae, 

 particularly on Poh/si2)honia fastigiata. 



44. Euteromorpha intestinalis, Link. 



Not so common as the next ; found in a tide-pool near high-water- 

 mark, on Campobello Island. 



45. Enteromorpha compressa, GrevUie. 



Very common about the docks, etc., growing as high up as the tide 

 ever reaches. 



46. Enteromorpha ? 



Floating in a large entangled mass in Cobscook Bay. — Fronds very 

 pale-green, unbranched, flliform, tubular, varying in width, when 

 compressed, from .001 inch to .03 inch ; cells sub-quadrate or oblong, 

 .0003 to .0005 inch in diameter, about eight rows in the slenderest 

 fronds. I cannot identify this with any pu1>lished species, but in the 

 present state of my knowledge of the genus I am unwilling to give it 

 a new name. The cells are much more regularly four-sided than in 

 E. coni^jressa. 



47. Ulva latissima, l. 

 Very common. 



48. Cladophora arcta, Diiiwyn. 



Abundant on rocks and piles of wharves near low-water-mark. 

 Older plants, with the filaments much matted together ( C centralis, 



