342 DISCOVERY REPORTS 



these young colonies has eight zooecia, and the frontal avicularia are all small and 

 directed frontally. 



2. Notoplites watersi (Kluge). 



Scrupocellaria watersi Kluge, 1914, p. 607, pi. xxviii, fig. 2. 



Scrupocellaria antarctica (part) Waters, 1904, p. 25. 



Notoplites watersi Harmer, 1923, p. 353. 

 Station distribution. Not represented in the Discovery collections. 



Geographical distribution. Bellingshausen Sea (Waters); Wilhelm II Land (Kluge); Oates 

 Land (Terra Nova) ; Ross Sea (National Antarctic Expedition). 



The bifurcation of Notoplites watersi is of the normal type for the genus, as sus- 

 pected by Harmer. Internal spines are present (see p. 339). 



The angular outline of the branches of N. antarcticus and the straighter appearance 

 of those of N. watersi, which are shown in Kluge 's figures, but not mentioned in his 

 comparison, are sufficiently marked to make it possible to sort a mixture of the two 

 species without magnification. The relation of this species to N. antarcticus resembles 

 in some ways that of N. vanhoffeni to N. drygalskii, as may be seen from the key, and in 

 each pair one species is widely distributed in the Antarctic region including South 

 Georgia, and the other has been found much less abundantly and only in the far south 

 (see p. 479), where, however, all four species may be found together (e.g. at St. TN 194 

 off Oates Land). 



3. Notoplites drygalskii (Kluge). Plate VI, fig. 6; Figs. 9 A-C, 11 A. 



Scrupocellaria drygalskii Kluge, 1914, p. 609, pi. xxvii, fig. 5. 



Notoplites drygalskii Harmer, 1923, p. 352; Livingstone, 1928, p. 25 (synonymy). 



Menipea funiculata Thornely, 1924, p. 6. 



Station distribution. Antarctic: Weddell Quadrant, Sts. 27, 42, 123, 140, 144, 148, 152, 175, 

 177, 181, 187, 363, 366, 371, 1872, WS 25, WS 27, WS 33 ; Victoria Quadrant, Sts. 1652, 1658, 1660. 



Geographical distribution. South Georgia; South Sandwich Islands; near Elephant Island; 

 South Shetland Islands ; Palmer Archipelago (Discovery) ; Adelie Land ; Queen Mary Land (Living- 

 stone); Wilhelm II Land (Kluge); Oates Land (Terra Nova); Ross Sea (National Antarctic Expedi- 

 tion; Terra Nova; Discovery). 



As mentioned above Notoplites drygalskii and N. vanhoffeni are related, but clearly 

 distinct, species. In N. vanhoffeni the aperture is narrowed behind the orifice by a 

 projection of the border on each side (Figs. 10 A, B); the scutum has a straight trans- 

 verse distal border and the operculum is placed symmetrically in the frame so formed. 

 In N. drygalskii the aperture is not contracted, the outer border bearing little or no 

 projection, the operculum is obliquely placed and the edge of the scutum is corre- 

 spondingly oblique (Fig. 9 A), but the operculum is not so closely framed. The obliquity 

 is especially pronounced in non-fertile zooecia (Figs. 9 A, B). The difference in inclina- 

 tion of the frontal avicularia is constant. The marginal avicularium is more distally 

 placed in N. drygalskii (cf. Figs. 9 A-C, 10 A, B, and Kluge 's pi. xxvii, figs. 5, 6). The 

 ovicells in N. drygalskii are immersed in the distal zooecium (Fig. 9 B). Those of 



