EXPLANATION OF PLATE 15 (XV) 



Figs. 1-5, X 30; Figs. 6, 7, X 20. 

 Figures 1-3, 5. — Sorites marginalis (Lamarck).* {Sorites hofkeri Lacroix?). 

 Figs 1-3. Challenger Sta. 260A, Honolulu reefs, Pacific. (40 fathoms) 

 Fig. 5. Challenger Sta. 173A, off Fiji, Pacific. (12 fathoms) 

 Referred by Brady to Orbitolites and by Cushman (U.S.N.M. Bull. 104, Pt. 7, 1930, p. 49) to Sorites (citing 

 Brady's figs. 1-5). Hofker (Jour. Roy. Micr. Soc, Vol. 72, Pt. 2, 1952, p. 109) has suggested that Sorites, Am- 

 phisorus and Praesorites should be placed in synonymy with Orbitolites, retaining Praesorites as a subgenus. 

 Douville (Bull. Soc. geol. France, Ser. 4, Vol. 2, 1902, pp. 291-296) retains Orbitolites, Praesorites and Sorites 

 as valid genera with Amphisorus in the synonymy of Sorites, and Henson (Middle Eastern Peneroplidae, 1950) 

 retains the same three genera without mention of Amphisorus. Henson is followed here, but as noted earlier 

 the Recent forms of this group need revising. 

 Figure 4. — Praesorites orbitolitoides Hofker.* {Sorites hofkeri subsp. orbitolitoides (Hofker)? — see note). 

 Challenger Sta. 33, off Bermuda, Atlantic. (435 fathoms) 

 Referred by Brady to Orbitolites marginalis Lamarck. This figure is referred to Praesorites orbitolitoides Hofker 

 here on the basis of Hofker's figures and description (Siboga Exped., Foraminifera Pt. H, 1930). 

 Figures 6, 7. — Discospirina tenuissima (Carpenter)? 



Fig. 6b. Porcupine Sta. 24, West of Ireland, E. Atlantic. (?) 

 Figs. 6c, 7. Station 44 (Challenger, North Atlantic?) (?) (? Porcupine Sta.). 

 Referred by Brady to Orbitolites and by Douville (Bull. Soc. geol. France, Ser. 4, Vol. 6, 1906, p. 596) to 

 Discospirina. Munier-Chalmas (Bull. Soc. geol. France, Ser. 4, Vol. 2, 1902, p. 162) erected the genus Dis- 

 cospirina with Pavonina italica Costa as genotype. Douville (1. c. supra) placed tenuissima Carpenter in syn- 

 onymy with italica Costa. Cushman ("Foraminifera," 1928, p. 165) ignoring Munier-Chalmas' reference to 

 italica Costa, designated tenuissima Carpenter the genotype, and this reference and also in 1927 and 1929 

 referred to the genus as Discospirinia. These errors were corrected by Galloway (Manual, 1933, p. 113), who 

 again noted that tenuissima is a synonym of italica Costa. Cushman (U.S.N.M. Bull. 104, Pt. 6, 1929, p. 93) 

 stated that they might be the same but that Costa's types should be examined. It is therefore possible that these 

 figures should be referred to Discospirina italica (Costa). Wiesner (Zool. Anzeiger, Vol. 51, p. 14, 1920) erected 

 Krumbachina with 0. tenuissima as genotype; this is regarded as a synonym of Discospirina. 



*NoTF.: E. Lacroix, in his paper "Les Orbitolites de la Bale de Cauda (IndochineV (Bull. Inst. Ocean., Monaco, No. 787, 1940, pp. 

 6,7, 10-11) states that the forms figured by Brady in figs. 1-5 all belong to Praesorites orbitolitoides Hofker. He goes on to say that he 

 does not regard these as belonging to Praesorites since they differ in their internal structure from that genus, and should be referred 

 to Sorites. On p. 10 Lacroix renames Hofker's species Sorites hofkeri, this name referring to forms from the Pacific and based on material 

 from Indochina, Australia and the east coast of Africa. He had no material from the West Indies and admits the existence of structural 

 differences in Hofker's figures of specimens from this region. These, however, he considers to be of varietal significance only. It would 

 therefore appear that Brady's figs. 1-3,5 should be named Sorites hofkeri Lacroix, and fig. 4 Sorites hofkeri Lacroix subsp. orbitolitoides 

 (Hofker). As noted the entire group needs further study and detailed comparison of material from all parts of the world. 



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