OP ARTS AND SCIENCES. 471 



form, which I can with difficulty distinguish from some of the New 

 England forms usually placed iu Rhodumela suhj'usca, Ag., were 

 found at Kikkerton Island by Kumlien. 



Delesseria sinuosa, Lamour. 

 Evidently as common in the Arctic Ocean as on the coasts of Europe 

 and New England, and represented by a very large number of speci- 

 mens collected by the present expedition. 



Delesseria Montagnei, Kjellman. 

 The present name was adopted by Kjellman in his Alga? of tlie 

 Arctic Sea, in order to distinguish Del. denticulata, Montague, from 

 Harvey's species of the same name. A large number of specimens, 

 which can be referred without doubt to Del. denticulata, Mont., 

 were collected at Ungava Bay. They are sufficiently distinguished at 

 siglit from Del. alata by the serrated margin of the fronds. Besides, 

 the lateral veins are with a lens generally easilj^ seen in the broader 

 parts of the fronds, thus agreeing with the description given by Kiit- 

 zing in the Tabulae Phycologicas. With regard to the relationship of 

 the alga from Ungava Bay to Del. spinulosa, Rupr., a species found 

 in the Pacific, I am unable to express any opinion, as in none of the 

 North Pacific collections which I have examined is there any form 

 resembling the present species. 



Delesseria alata, Lamour. 

 A number of specimens which seem without doubt to belong to this 

 species were collected at Ungava Bay. They resemble closely the 

 broader form of the species found on the British coast. A few small 

 specimens resembling rather the common narrow foim of the New 

 England coast than the type, were found on Plilota serrata, collected 

 by Kumlien. Delesseria angnstissima, Griff., a species certainly 

 closely related to Del. alata, must be very rare on the American 

 coast, if it occurs at all. A single specimen, collected several years 

 ago at Cape Ann, by INIrs. Lusk. and referred by me to Del. angustis- 

 smr/, has cystocarpic fruit. Unfortunately the specimen was somewhat 

 water-worn when collected, and, on that account, the determination is 

 somewhat uncertain. 



Delesseria Baerii, Rupr. 

 Delesseria cory.mbosa, J. G. Ag. 

 The members of the subgenus Cri/ptnneura are, with one excep- 

 tion, very difficult to distinguish. This arises in part from the small 



