260 SEA MOSSES. 



single pair of ramuli, at each joint, while C. cru- 

 ciatum, frequently has two. The color of this species 

 is like that of C. Pylaisai, a. bright red. 



Mrs. Davis and Mrs. Bray find it in abundance at 

 Niles Beach, Magnolia, during April and May. Profs. 

 Verrill and Eaton found it common, growing on 

 Ptilota plumosa, at Dog Island, Maine, and on mussel 

 shells among the wharves at Eastport, during August 

 and September. 



Callithamnion cruciatum, Ag. 



This species grows only on the south side of 

 Cape Cod, and is certainly somewhat scarce. It 

 grows in deep water, on muddy rocks, in globose 

 tufts, an inch or more high, of a bright red color ; 

 filaments, like most of the genus, very slender. The 

 frond divides or forks not widely, the lower divi- 

 sions are far apart, the upper close together. The 

 branches themselves fork one or more times. 



The ramuli, which are set in one or two pairs upon 

 the upper end of each of the cells in the filaments, 

 are mostly long and branched, one-twelfth of an inch 

 long. They stand out almost perpendicular to the 

 the axis of the filament. 



The one point which distinguishes the mounted 

 plant so that it can hardly fail of easy recognition, is 



