ENCOELIACEAE. 505 



lobeol or wrinkled cushions, sometimes as large as a man 's fist, on rocks just 

 below the low-water marks, as on White 's Island, in Hamilton Harbor, etc. 

 (Phyc. Bor.-Am. 2024.) 



Hydroclathrus cancellatus Bory, is somewhat similar to the above in color, 

 habit and distribution, but it has a perforate or net-like thallus. Spanish 

 Eock. (Phyc. Bor.-Am. 2078.) 



Scytosiphon Lomentaria (Lyngb.) J. Ag. is one of the few algae of the 

 North Atlantic that occur also in Bermuda. It has a hollow, unbranched, 

 cylindric or slightly flattened, brownish or olive-green thallus, often constricted 

 at intervals, and commonly 2-10 inches long, and r*-l inch in diameter. 

 (Shelly Bay, Hervey 'Phyc. Bor.-Am. 2079.) 



Rosenvingea intricata (J. Ag.) B0rg. has a tubular very irregularly 

 branched thallus. Single plants form flattened tangled olive-green mats 

 mostly 1 to 5 inches broad. The main branches attain a diameter of 1 or i 

 lines, this diameter being much reduced at the dichotomo-palmate extremities. 

 (Harris Bay, Hervey Phyc. Bor.-Am. 2173.) 



Family MESOGLOIACEAE. 



Castagnea Zosterae (Mohr?) Thuret (?) is a name that may be applied 

 with considerable doubt to a brownish gelatinous irregularly branched plant 

 that grows attached to leaves of the Turtle Grass (Thalassia testudinum) in 

 Castle Harbor and doubtless elsewhere in the Bermudas. It grows to be from 

 four to eight inches long, with its larger branches about ^ in. in diameter and 

 the smaller about ^ in. It is a larger, more copiously branched plant than 

 those from more northern waters to which the above name is currently applied. 

 There is doubt not only as to its specific identity, but even more as to the 

 legality of the nomenclature here provisionally adopted. It is probable that 

 a thorough-going revision of the Mesogloiaceae, accompanied by a critical 

 study of the type specimens on which various genera and species have been 

 based, may show that the legal generic name for this plant is Aegira, proposed 

 in 1825 by Elias Fries for the Linckia Zosterae of Lyngbye. The various 

 genera proposed later for members of this group seem to be distinguished 

 from each other by characters of uncertain value and constancy and it is 

 probable that one or more of the names Myrioeladia J. Ag., Cladosiphon 

 Kiitz., Castagnea Derb. & Sol., and Eudesme J. Ag. may be found to be generic 

 synonyms of Aegira. The Bermuda plant has been distributed in the Phyco- 

 theca Boreali-Americana (1879) as Castagnea mediterranea (Kiitz.) Bornet, 

 but it is a more slender, more freely branched, and more gelatinous plant than 

 the original Cladosiphon mediterraneus Kiitz. and has longer peripheral fila- 

 ments. Moreover, C. mediterraneus t is the monotype of Cladosiphon and the 

 current rules of nomenclature would forbid its transfer to the later-published 

 Castagnea. 



Family SPOROCHNACEAE. 



Sporochnus Bolleanus Mont, is found washed ashore on the South Beach. 

 It is a brownish freely branched plant a foot or more in height. The main 



