Gastrocarpe(2.'] dumontia. 229 



1. GlNNANlA FURCELLATA, 3Iart. 



Hab. On rocks and shells in deep water. Annual. Sum- 

 mer. Eatlier rare. 



This fine plant may seem to resemble the dichotomous 

 varieties Qillalymenia ligulata, but the structure and frond 

 are different. Professor Harvey mentions a remarkable 

 feature of its structure that has been little attended to, 

 viz., an axis or internal rib somewhat like the midrib of a 

 Delesseria. This plant has been got in England and Ireland ; 

 but it had not been got in Scotland till the autumn of 1850, 

 when it was dredged in Arran by Mrs. Balfour, of Edin- 

 burgh, and gathered by her also at very low water on the 

 rocks betwixt Lamlash and Corriegills. Major Martin 

 likewise dredged it in Lamlash Bay. '^ 



Genus LXII. DUMONTIA, Lammir. 



Gen. Char. J^i-ond cylindrical, simple, or branched, membra- 

 naceous, tubular, gelatinous within, of a red or purplish-red 

 colour. Fructification, globules of seeds attached to the inner 

 surface of the membrane of the frond. — The name is in honour 

 of M. Dumont, a Trench naturalist. — Greville. 



1. DuMOXTiA riLiFOR^iis, GvevUle. (Plate X. fig. 40.) 

 Hab. Stones and rocks in the sea. Annual. Summer. 



