260 THE MARINE ALG^ OF SOUTH CAROLINA AND FLORIDA. 



17. Alsidium triangulares Ag. One or two fragments obtained from 

 deep water. {= Bryothamnium, Ag.) 



18. Acanthox)Tiora Thierii, Lmx. Givenme from Indian river Inlet, 

 Florida (Prof. Lewis, R. Gibbes). 



19. Acanthophora Delilei, Lmx. Key "West. Common. 



20. Chondria dasyphylla, Ag. Key West. Common, and some- 

 what variable. 



21. Chondria sedifoUa^ Harv. Common at Key West. This is 

 omitted from Prof. Tarlow's list. It is surely a distinct species from 

 C. dasyphylla. 



22. Chondria littoralis, Harv. Key West. Abundant. 



23. Chondria atropurpurea, Harv. Sullivan's Island, Charleston 

 (Prof. L. R. Gibbes). 



Besides these I found two Chondriae, one at Cedar Keys, the other 

 at Key West, single specimens of each that are hard to determine. 

 The latter approaches C. Baileyana, but is more slender. 



24. Digenia simplex^ Harv. Key West. Abundant, but almost 

 always covered with parasitical growth. The best specimens I ob- 

 tained from Cedar Keys, West Florida. 



25. Polysiphonia Havanensis, Mont. Key West. Mostly the form 

 P. Binneyi, Harv., which used to be considered a distinct species. 



26. Polysiphonia ferulacea, Ag. (= hreviarticulata, Harv.). The 

 commonest of the genus at Key West. Young specimens are fibrillose 

 at the tips of the branches, and consequently present a very different 

 appearance from the mature plant. 



27. Polysiphonia ramentacea, Harv. (=P. hirta, Ag.). Very rare at 

 Key West. Three specimens obtained. 



28. Polysiphonia hapalacantha^ Harv. Key West. Rare. 



29. Polysiphonia secunda, Mart. Key West. Principally parasi- 

 tical on Digenia simplex, Ag. Yery abundant. 



30. Polysiphonia variegata, Ag. Charleston, South Carolina. Abun- 

 dant and very fine, about ten inches long. Prof. Farlow makes no 

 mention of this in his list. 



31. Polysiphonia Pecten- Veneris, ^arv. One small specimen. Key 

 West. 



32. Polysiphonia hipinnata ?, Ag. A specimen I sent to Prof. J. G. 

 Agardh was thus named with a query ** an nov. sp. ?" P. hipinnata 

 has only been recorded so far from the west coast. The fragment I 

 found, and which is in the hands of Prof. Agardh, was not in fruit, so 

 far as I recollect.* 



33. Bostrychia calamistrata, Mont. Common at Key West. Only 

 on the north side of the island, on stems of mangroves. I did not 

 find a single specimen on the south side, which is by far the most 

 favourable for Algae in general. 



34. Bostrychia rivularis, Harv. Ashley River, Charleston. On 

 stems of Spartina glabra. 



35. JDasya {Compsoteia) Gihbesiiy Harv. Yery common at Key 



• Besides these I found two or three species of Polysiphonia at Key West, 

 which are not in a state to be determinable, but are diflferent from all thoae 

 enumerated. 



