NUMMULINIDAE 191 



Common and typical at St. 187 in the Palmer Archipelago, 200 m.; very rare else- 

 where. 



525. Elphidium excavatum (Terquem) (F 413). 

 One station: 385. 



A single small and pauperate specimen from deep water (3638 m.) in the Drake 

 Strait, just within the Antarctic convergence line. 



526. Elphidium magellanicum, Heron- Allen and Earland (F 416). 

 One station: 363. 



A single typical specimen from 329 m. in the South Sandwich Islands. 



527. Elphidium macellum (Fichtel and Moll) (F 418). 

 One station: 175. 



Only a single specimen. 



528. Elphidium owenianum (d'Orbigny) (F419) (SG 345). 

 Five stations: 170, 194; WS 480, 482, 494 B. 



Extremely rare ; single small specimens, except at St. 170 where two were found. The 

 depths range between 50 and 812 m. and the stations are in the line between the South 

 Orkneys and the Bransfield Strait. 



Sub-family NUMMULITINAE 

 Genus Operculina, d'Orbigny, 1826 



529. Operculina balthica (Schroeter). 



Nautilus bahhicus, Schroeter, ECK, 1783-6, vol. i, p. 20, pi. i, fig. 2. 



Nonionina elegans, Williamson (wow d'Orbigny), 1858, RFGB, p. 35, pi. iii, figs. 74, 75. 



Operculina amnwnoides, Carpenter, Parker and Jones (tion Gronovius), 1862, IF, p. 310. 



Opeiculina ammouoides, Brady (wow Gronovius), 1884, FC, p. 745, pi. cxii, figs, i, 2. 



Operculina ammonoides, Heron-Allen and Earland (wow Gronovius), 1913, CI, p. 147; 1922, TN, 



p. 230. 



Anomalina balthica, Cushman, 1918, etc., FAO, 1931, p. 108, pi. xix, fig. 3. 



Anomalina balthica, Hofker, 1932, GNA, p. 136, figs, in text 44, 45. 



One station: 180. 



This little species is a true cosmopolitan, and often very abundant in cold water, 

 though Cushman says it is not found in the Western Atlantic. It was found by the 

 Terra Nova in the far south of the Ross Sea, but Pearcey does not record it in the 

 Weddell Sea, or Wiesner from Kaiser Wilhelm's Land. It occurs at St. 180 only, in the 

 Palmer Archipelago, 160 m., where it is very rare. 



As the synonyms indicate the species has been placed in several genera. Cushman 

 now transfers it to Anomalina, and Hofker follows suit. The chief objections to its 

 figuring as an Operculina have been its small size, cold-water habitat, and the apparent 

 absence of the canal system which is so highly developed in the tropical species of that 

 genus. But Hofker has recently demonstrated the existence of a simple canal system, 

 which seems fatal to its continuance in the genus Anomalina. 



