286 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



1G. C. divaricata, AG. Wood's Hole, Orient, Greenport. Very cora,- 

 . mon all summer in warm, shallow bays. To the eye this would 

 appear to include two species. The young and growing parts 

 are solid and very tortuous, and resemble, when dried, a Meso- 

 gloia. As the plant grows older the stem often becomes hollow, 

 and many of the branches fall off, giving the plant a coarse 

 appearance. 



17. Leathesia tuber if ormis, S. F. Gray. Washed ashore on Buzzard's 



Bay and Orient Point, but not seen growing. 



18. Elachista fucicola, Fries. Wood's Hole. Parasitic on Fuci. 



ECTOCARPAOE^E. 



19. Cladostephus verticiUatns, Ag. Orient, Gay Head. Very common 



toward No Mans Land. 



20. C. spongiosum, AG. Newport. 



21. Sphacelaria cirrhosa, AG. Common at Wood's Hole and Wee- 



peeket Islands, Greenport, Orient. 



22. Myriotrichia filif 'or mis, Griff. On Chorda lomentaria. Point Ju- 



dith, (S. T. Olney.) The only recorded case of this plant being 

 found in America is that of Mr. Hooper, mentioned in the ap- 

 pendix to Harvey's Nereis, who found it in Penobscot Bay on 

 Dictyosiphon. In Europe it is almost always found on Chorda 

 lomentaria. 



23. Eetoearpus littoralis, Lyngb. Everywhere common on Fucus. 



24. E.fasciculatiis, Harv. Gay Head and Nobska. 



25. E. Durkeei. Harv. Gay Head. 



25.* E. viridis, Harv. Wood's Hole, {fide D. C. Eaton.) 



EHODOSPERMEJS. 



Rhodomelace^e. 



26. Chondria (Chondriopsis, Ag. ;) dosyphylla, AG. Common on stones 



and the larger algae at low-water mark. Wood's Hole, Orient. 

 C. dasyphylla, var. sedifolia. Not noticed by Harvey north of Key 

 West, but not uncommon at Wood's Hole. 



27. C. Baileyana, Harv. Very common, and with the last. Agardh 



refers this with a query to his Chondriopsis striolata of the 

 Adriatic. I have compared my specimens with one of G. strio- 

 lata from Agardh in the herbarium at Cambridge, and it seems 

 to be the same, but further comparison is needed. 



28. C. Uttoralis, AG. Wood's Hole. Not at all common ,• a species 



easily recognized when seen, but difficult to describe. Not no- 

 ticed by Harvey north of Key West. 



29. Bhodomela subfusca, Ag. Gay Head, Vineyard Sound. 



30. Polysiphonia urceolata, Grev. Government Wharf, Wood's Hole, 



Orient Point. Var. formosa. Orient, Nantucket. 



