262 DISCOVERY REPORTS 



Family GRANTIIDAE 

 Genus Grantia, Fleming 

 Grantia cirrata (Jenkin), var. aurorae, Dendy. 



G. cirrata, var. aurorae, Dendy, 1918, p. 11, pi. I, figs, 4, 9. 

 Occurrence. St. 53 : Falkland Islands, 0-2 m.; St. WS 33 : South Georgia, 130 m. 

 Distribution. Off Gates Land. 



Grantia cirrata (Jenkin), var. tenuipilosa, n. 



Type of var. B.M. 28. 2. 15. 708. 



Occurrence. St. 53 : Falkland Islands, 0-2 m.; St. WS 85: Falkland Islands, 79 m. 



Remarks. The two specimens are very like the typical form in external appearance, 

 in the arrangement of the skeleton and in the size of the spicules. The only feature by 

 which this variety may be distinguished is the form of the long oxea echinating the sur- 

 face. These are usually 1-2 mm. in length but rarely exceed 0-012 mm. in diameter, and 

 are only slightly, though very irregularly, curved. 



The typical form of the species, together with the var. aurorae and the present variety, 

 are all very much alike except for the form of the dermal oxea, and it is probable that a 

 distinction into varieties is unnecessary. But until we can see for certain that the dermal 

 oxea are subject to considerable variations in size, I prefer to consider the present 

 specimens as constituting a separate variety of the species. 



Order TETRAXONIDA 

 Sub-order HOMOSCLEROPHORA 

 Family PLAKINIDAE 



Genus Plakina, Schulze 



Plakina monolopha, Schulze. 



P. monolopha, Schulze, 1880, p. 407, pi. xx, figs. 1-7, pi. xxii, figs. 22-29; GraefFe, 1882, p. 319; 

 SoUas, 1888, p. 278; Topsent, 1890, p. 231 ; Lendenfeld, 1894, p. 96, pi. iii, fig. 46; Topsent, 

 1896, p. 549, pl.xxi,figs. 1,2, pi. xxii, fig. 12; Thiele, 1898, p. 28, pi. v, fig. 13, pi. vii, fig. 11 ; 

 Lendenfeld, 1903, p. 120; id., 1907, p. 336; Topsent, 1925, p. 629; Burton, 1929, p. 414. 



Occurrence. St. 6: Tristan da Cunha, 80-140 m. 



Distribution. North Atlantic ; Mediterranean ; Japan ; Antarctic. 



Plakina trilopha, Schulze. 



P. trilopha, Schulze, 1880, p. 407, pi. xx, figs. 1-7; Placina trilopha, Sollas, 1888, p. 279; 

 Topsent, 1890, p. 232; Lendenfeld, 1894, p. 98, pi. iii, fig. 45, pi. iv, fig. 54; Topsent, 1896, 

 p. 555, pi. xxi, figs. 4-6 ; Lendenfeld, 1903, p. 121 ; Plakina trilopha, subsp. aiitarctica, id., 1907, 

 p. 333, pi. XXV, figs. 30-43; Placina trilopha, Babic, 1921, p. 17; id., 1922, p. 291; Plakina 

 trilopha, Burton, 1929, p. 414. 



