OF ARTS AND SCIENCES. 863 



silica, from which it is easily distinguished by its ramification, which is 

 more like a Microcladia. 



132. PoLYSiPHONiA. NiGRESCKNS, Grev. East and west coasts. 



133. PoLYsiPHONiA VEUTiciLLATA, Harv. California. 



134. PoLYsiPHONiA FASTiGiATA, Grev. New York northward. 



135. BosTUYCHiA MoNTAGNEi, Harv. Key West. 



136. BosTRYCHiA CALAMIST15ATA, Mout. Key West. 



137. BosTRYCHiA RivuLARis, Harv. Isle of Shoals, N.H., to 

 Florida. 



138. BosTRYCHiA TuOMEYi, Harv. Florida. 



*139. BosTRYcniA Moritziana, Mout. Florida, Dr. E. Palmer ; 

 Guiana and AVest Indies. 



140. Dasya Gibbesii, Harv. Key West. 



141. Dasya elegans, Ag. Key West. 



142. Dasya ramosissijia, Harv. Key "West. 



143. Dasya Harveyi, Ash mead. Key "West. 



144. Dasya mollis, Harv. Key West. 



145. Dasya mucronata, Harv. Key W^est. 



146. Dasya Wurdemanni, Bailey. Key West. 



*147. Dasya callithamxion, Harv. San Diego, Cal., Mr. D. 

 Cleveland. — Differs from D, Wurdemanni, in showing on cross-sections 

 only four cells surrounding a central cell. 



148. Dasya Tumaxowiczi, Gatty. Key West. 



149. Dasya lopiioclados, Mont. Key West. 



150. Dasya plumosa, Bail. & Harv. West coast. 



Dasya coccinea, Ag., a common European species, is said to have 

 been found on the coast of Maine. 



LAURENCIACE^. 



151. Laurencia pinnatifida, Lmx. California. 



152. Laurencia virgata, Ag. California. 



153. Laurencia obtusa, Lmx. Florida, California. 



154. Laurencia implicata, Ag. Key West. 



155. Laurencia cervicornis, Harv. Key West. Not referred 

 to by Agardh in his Spec. Alg. 



156. Laurencia gemmifera, Harv. Florida. 



157. Laurencia papillosa, *Grev. Florida. 



*158. Laurencia paniculata, Ag. Key West, Dr. E. Palmer. 

 159. Champia parvula, Harv. Long Island Sound. Common. — 

 Northern limit f 



