i88 DISCOVERY REPORTS 



507. Eponides sidebottomi, sp.n. (Plate VIII, figs. 33-35). 

 Two stations: WS 205, 403. 



Test small, hyaline, biconvex, dorsal side exhibiting 2-3 convolutions with five 

 chambers in the final convolution. Sutures flush and nearly straight. Peripheral edge 

 rounded. Ventral side exhibiting only the five chambers of the final convolution; 

 sutures oblique, slightly recurved. Umbilicus solid and flush. Aperture a small curved 

 slit on the inner edge of the apertural face. 



Breadth 0-23 mm.; thickness 0-15 mm. 



Four specimens at St. WS 403 and one at St. WS 205, depths 3721-4207 m. The 

 most interesting feature about this otherwise rather obscure little form was the presence 

 on one of the specimens of a large inflated " balloon " or accessory chamber, nearly as 

 large as the organism itself, identical with that figured by Sidebottom (S. 1918, FECA, 

 p. 261, pi. vi, figs. 27-29) on an organism which he ascribed to Rotalia soldanit, with 

 hesitation. The balloon in my specimen was so extremely thin and fragile that it col- 

 lapsed in mounting. 



Sidebottom's organism was certainly not Rotalia soldanii but an Eponides. It is not 

 the same as the Discovery form, having nine chambers to the convolution, but in other 

 respects is very similar. The purport of the " balloon " chamber in two different organ- 

 isms is obscure. It may be compared with the similar structure found occasionally in 

 Polymorphina williamsoni Terquem, and figured in the Falklands report (F 285, pi. xii, 

 fig. 28). I have named the Discovery species after the first observer of the " balloon". 



Genus Epistomina, Terquem, 1883 



508. Epistomina elegans (d'Orbigny) (F 385) (SG 321). 

 Two stations: WS 469, 505. 



One very small specimen was found at St. WS 469 in the Scotia Sea (3959 m.), and 

 two large specimens at St. WS 505 in the far south of the Bellingshausen Sea (1500 m.). 

 The latter were dead and worn shells of the tYnck-waWed partschiana type. This position, 

 70° 10' 30" S, 87"^ 46' W, is in a very high latitude for the species, though it was recorded 

 by the Terra Nova from 69° 51' S, 166° 17' W. 



Genus Laticarinina, Galloway and Wissler, 1927 



509. Laticarinina pauperata (Parker and Jones) (SG 326). 

 One station : WS 204. 



Only two small specimens from a depth of 3328 m. 



Genus Rotalia, Lamarck, 1804 



510. Rotalia beccarii (Linne) (F 393) (SG 327). 

 Two stations: 180; WS 482. 



A single small specimen at each station. They are very like the specimens figured by 

 Brady (B. 1884, FC, pi. cvii, fig. 5) and ascribed by him to R. orbicularis, which they 

 certamly are not, but young or pauperate R. beccarii (see H.-A. and E. 1922, TN, p. 219, 

 No. 599). Brady figures R. orbicularis correctly on a subsequent plate, pi. cxv, fig. 6. 



