416 



BULI^TIN 100, UNITED STATES NATIONAL MUSEUM. 



second gi-oup of species is that represented by Indo-Pacific species, 

 which occur characteristically in the South Pacific, about Australia, 

 northward to southern Japan, westward to the Hawaiian Islands, and 

 usually eastward through the Indian Ocean to the coast of Africa. 

 Such species are often widely distributed in shallow water, often occur- 

 ring in great numbers. The third group are those which seem to be 

 characteristic of this region, and may either represent local species or 

 more widely spread species which have not been recorded elsewhere. 

 These include some of the largest and most characteristic species of 

 the region. 



QUINQUELOCULINA SEMINULUM (Linnnens). 



Plate 88, figs. 4a-c. 



Serpula seminulum Linnaeus, Syst. Nat., ed. 12, 1767, p. 1264, No. 791. 

 Quinqueloculina semivulum d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 303, 



No. 44.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 44, pi. 11, fig. 2, 



fig. 29 (in text). 

 Miliolina seminulum Williamson, Recent Foraminifera of Great Britain, 1858, 



p. 85, pi. 7, figs. 183-185.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 



1884, p. 157, pi. 5, figs. 6a-c. — Heron-Allen and Earland, Trans. Zool. Soc. 



London, 1915, vol. 20, p. 569, pi. 42, fig. 31. 



There are numerous specimens which can be referred to this species, 

 but they are not common at any station, and are found, as a rule, 

 in the region of the Sulu Sea. 



Specimens have occurred at 13 stations, ranging in depth from 

 18 to 159 fathoms (35 to 291 meters), the average depth being 40 



fathoms (73 meters). 

 These localities repre- 

 sent the following : China 

 Sea, off southern Luzon; 

 Sulu Sea, off western 

 Mindanao; near Basilian 

 Island; off Jolo; and off 

 Tawi Tawi. 



It has also occurred 

 rarely off northern Cebu 

 and in Buton Strait. 



Specimens are re- 

 ferred to this species 

 from almost all parts of 

 the world, and, being 

 smooth and with few distinguishing characters, many species or 

 varieties have been placed under this name. Heron-Allen and 

 Earland record it from the Kerimba Archipelago, where, accord- 

 ing to them, it shows a great amount of variation. The largest 

 specimens from the Philippine region, when fully grown, measure 



Figs. 19, 20.— Quinqueloculina seminulum (Linnaeus). X 20. 

 Feom Albatross station d5152. 19, specimen with the tip 



OF THE tooth BECOMING BIFID. 20, SPECIMEN WITH THE TOOTH 

 FORKED AND MUCH BEOADENED TOWARD THE TIP. 



