OF ARTS AND SCIENCES. 475 



that is really distinct from K. reiiiformis or not. Specimens of Kal- 

 lymenia are among the rarities of the Atlantic coast of America, and 

 the genus is known on the New England coast only from a single spe- 

 cimen collected near Boston by Mr. F. S. Collins. The Ungava Bay 

 specimens are large, and apparently belong to mature planfs ; but, in 

 the absence of a stipe and a set of younger specimens, the determination 

 may be questioned. 



Ptilota pectinata, Kjellm. 



Under this name, Kjellman, in his Algae of the Arctic Sea, includes 

 the Ptilota serrata of Agardh, and the P. plumosa var. serrata of 

 Kiitzing, as the type form of the species first described in Gunner's 

 Flora Norvegica as Fucus pectinatus. A large number of specimens 

 were collected at Ungava Bay, which are identical with the common 

 New England form. There were besides a small number of speci- 

 mens which may be referred to the variety integerrima, Kjellman, 

 loc. cit., Plate XV. fig. 1. 



Callithamnion Americanum, Harv. 

 Ungava Bay (Turner, no. 449, 770, and 820). 



Callithamnion Pylais^i, Mont. 

 Ungava Bay (Turner). Gulf of Cumberland (Kumlien). 



Callithamnion (Antithamnion) boreale, Kjellman, var. 

 CORALLiNA, Kjellman? 



A single specimen collected at Ungava Bay may perhaps be referred 

 to this species, but the material was not sufficient to enable me to speak 

 with confidence. 



Rhodochorton Rothii, Naeg. 

 In the account of the Algne of the Howgate Expedition this species 

 is reported from the Gulf of Cumberland. The specimen was sterile, 

 and the determination necessarily doubtful. 



DiPLODERMA miniatum, Kjellman. 

 The genus Diploderma of Kjellman includes the species of Por- 

 phyra whose fronds consist of a double layer of cells. Among the 

 rough-dried specimens from Ungava Bay was a large specimen which 

 can with very little doubt be referred to the present species. Natu- 

 rally, alg;e of this genus are much injured by resoaking ; but, in spite 

 of the unsatisfactory state of the specimens when mounted, a micro- 



