T. H. hLKFHAM OS ANTHKhllHA. 297 



The male colls approach the surface of the gelatine more nearly 

 than in Dfilesfieria, and that surface a.ssumes a much more 

 regular level (Fig. 30j. (Deal, Oct. 1891, by Mr. Xeeve. 

 Previously collected at Berwick by Mr. E. A. Batters, Nov. 

 1889.; 



Bonne-maisonia asparagoides Ag., one of oar rarer algae, is also 

 very beautiful when fresh, but it seems impossible to preserve 

 this delicate plant without considerable change in the contents 

 of the cells of the thallus. But with regard to the anther-idia 

 the condition is very well maintained in a saturated solution of 

 sodium chloride. I have not met with plants wholly male, but 

 was fortunate in taking a considerable number where everyone 

 had those organs ori the upper portions, while the lower por- 

 tions bore cystocar-ps. (Swanage, Aug. 1890.) The antheridia, 

 like the cystocarps, are always opposite to a raraulus, and 

 frequently alternate with a procarp. Dr. Bomet states that 

 on the monoecious plants the antheridia are smaller than on the 

 plants wliolly male. In my specimens they reached 100 /j. in 

 height, with a maximum thickness of GO //.. They are obovoid, 

 but generally un.syrametrical, white, with a central axis of 

 small cells. The elongated male cells suiTOund this axis in a 

 unifoiTu thickness. The figure of Derbes and Solier (Meraoire 

 sur fiuelques 'points de la physiol/jgie des aUjv^s) does not exhibit 

 this char-acter very well ; I have therefore attempted to do so 

 (Fig. 31). 



By the kindness of Mr. E. A. Batters I am enabled to add to 

 these notes a dcscr-iption of the antheridia of Odo-rdiuilia dentata 

 Lyngb. They occupy similar positions to those of the cysto- 

 car-ps and tetraspores, and consist of tufts of paler leaflets near 

 the axils. The leaflets are 2-3 mm. long by 1-12 wide, and 

 are thus visible to the unassisted eye (Fig. 32;. Their for-m is 

 ovate, sometimes inequilateral, frequently bifid (Fig. 33; ; and 

 they are unifor-mly covered on both faces by the antheridial 

 layer, excepting on a narrow margin (Fig. 34). A transverse 

 section shows the leaflet thickened along the middle (Fig. 3o; ; 

 and the brownish, rather stout, male cells, which emit the 

 pollinoids, rise nearly to the surface, having only a thin gela- 

 tinous covering TFig. 3G). Kiitzing br-iefly mentions the leaf- 

 like " Kpermatoidia " [anther-idia] in Fhycoloyia gen^ralisj p. 109 

 (1843; ; and again in Species AUjarum, p. 84^5 ; but I know of 

 JouRy. Q. M. C, Series II., No 33. 21 



