V. CRYPTONEMIACE^. 183 



secondary branches taper to a fine point, and are muriculated on all sides with very 

 minute, broadly subulate or conical, simple or slightly bifid spines. The frond is 

 formed of a simple, jointed axial filament of large diameter, with internodes con- 

 taining endochrorae and about thrice as long as broad, coated externally by a thin 

 stratum of minute cellules, from which radiate to all sides numerous, dichotomous, 

 mouiliform, horizontal filaments, whose apices, strongly soldered together, unite to 

 form the periphery. The substance is firmly cartilaginous, rigid when diy. Colour 

 a very dark-red brown. ConcejJtades spherical, sessile on the ramuli. 



Dr. Ruprecht's Acanthocladia hamulosa is in all respects identical with my Gigar- 

 t'lna muricata, first described in the Botany of Beechey's Voyage. His A. miiricata 

 is more slender and less regularly muricated than most of my specimens, but I do 

 not consider it specifically different. I have not seen any specimens of Agardh's 

 E. vernicata. 



Plate XXVII. B. Fig. 1. Tuft of Endocladia muricata, the natural size. Fig. 2, 



part of a frond with conceptacles ; Jig. 3, apex of one of the muricated branches ; 



Jig. 4, transverse section of the stem ; Jig. 5, longitudinal section of the same ; Jig. 



6, vertical section of a conceptacle ; the latter figures more or less highly magnijied. 



XIII. GLOIOPELTIS. /. Ag. 



" Frond cylindrical, tubular, lubricous, cartilaginous, dichotomous and branched, 

 composed of two strata ; a monosiphouous, articulated, flexuous, axial filament runs 

 through the empty tube, and throws ofi" at alternate sides, di-tri-chotomous, corym- 

 boso-fastigiate, moniliform, horizontal filaments, which (united by a loose gelatine), 

 form the peripheric stratum. Conceptacles hemispherical, containing within a peri- 

 carp finally opening by a pore, numerous luxly aggregated nucleoli separated by 

 barren filaments running from an axial placenta to the pericarp. Tetraspores 

 oblong, cruciate, scattered among the moniliform, peripheric filaments." /. Ag. 



Two species, with neither of which am I acquainted, constitute the present genus ; 

 one of them (the Fucus tenax, Turn. Hist. t. 125) a native of the Chinese seas, and 

 used extensively in the arts of China and Japan ; the other a minute plant from 

 the Northern Pacific, which I give beloAV as being probably a native of Russian 

 America. 



1. Gloiopeltis /«rmta, J. Ag. ; "dwarf, tufted; fronds rising from a minute 

 crust, erect, filiform, attenuated at both ends, simple or sparingly forked." J. Ag. 

 Sp. Alg. 2, p. 235. Dumontia furcata, Post, and Rupr. Illustr. p. IV- Kiitz. Sp. 

 %.J0. 719. 



