OF ARTS AND SCIENCES. 473 



land form, and apparently Riiprecht doubts whether it is distinct from 

 his Del. Baerii. By Agardh and Kjellmau the two are kept distinct. 

 Certainly one is not warranted in expressing a definite opinion from 

 an examination of the figures of Del. rostrata in L3 ngbye and the 

 Flora Danica, for they are too imperfect to be recognized with cer- 

 tainty. On the whole, I am inclined to regard all the specimens from 

 Ungava Bay as forms of a single species, because there are several 

 specimens which connect the two sets already described. So far as 

 they can be divided into two sets, I should consider them to belong 

 in part to Del. corymhosa, and in part to Del. Baerii, on the grounds 

 above stated, and the copious material from Ungava Bay warrants one 

 in asking whether the two species in question are really distinct. A 

 single specimen of what is here called Del. Baerii was found at Prince 

 Edward's Island, in a collection received from Mrs. A. L. Davis. 



Delesseria Jurgensii, J. G. Ag. 



Delesseria crassifolia, Eupr. 

 These two characteristic Algns of the North Pacific were found in 

 a collection from St. Paul's Island, Behring's Straits, received from 

 Prof. D. C. Eaton. 



Ehodtmenia palmata, Grev. 

 Ungava Bay (Turner 423 and 4870). Large specimens of the 

 typical form. Although this species has been recorded in several 

 works as occurring in the North Pacific, it is extremely doubtful 

 whether such is the fact. All the Pacific specimens referred to this 

 species which I have seen have proved, on microscopic examination, to 

 belong to CallophyUis, or other genera than Rhodymenia. 



RHODOrnYLLis veprecdla, J. G. Ag. (Fiicits dichotomus, Lepechin.) 



Ungava Bay (Turner, 447, 765, 809, and 4872), Annanactu Har- 

 bor. On rocks at low tide, October, 1877, and Ovifak, Greenland, 

 August, 1878 (Kunilien). 



Typical forms. The broadest specimens which I have ever seen 

 were collected on the coast of Massachusetts. 



Euthora cristata, J. G. Ag. 



Ungava Bay (Turner). Annanactu Harbor, on rocks at low tide 



(Kumlien). Common as is this species on the New England coast, 



our Arctic collectors have brought home but ^evf specimens. The 



single small specimen from Ungava Bay had cystocarpic fruit. Most 



