FOEAMINIFEEA OF THE PHILIPPINE AND ADJACENT SEAS. 267 



POLYMORPHINA GIBBA d'Orbigny. 



" Polymorphina Suhcordifomiia vel Oviformia" Soldani, Testaceographia, vol. 



1, pt. 2, 1791, p. 114, pi. 113, figs. ZZ, C, etc. 

 Polymorphina (Globulina) gibba d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 226, 



No. 20; ModMes, 182G, No. 63. 

 Polymorphina gibba H. B. Brady, Parker, and Jones (part), Trans. Linn. 



Soc. London, vol. 27, 1870, p. 216, pi. 39, figs. 2a-d.—R. B. Brady, Rep. 



Voy. Challenger, Zoology, vol. 9, 1884, p. 561, pi. 71, figs. 12a, b. — Cushman, 



Bull. 71, U. S. Nat. Mus., pt. 3, 1913, p. 85, pi. 41, fig. 4. 



This species occurred at but two stations, D5121, east coast of 

 Mindoro, 108 fathoms (198 meters), and D5141, vicinity of Jolo, 29 

 fathoms (53 meters). Single specimens were obtained at each station. 



Polymorphina gibba — Material examined. 



POLYMORPHINA ELEGANTISSIMA Parker and Jones. 



Plate 54, figs. 1, 2. 



Polymorphina elegantissima Parker and Jones, Philos. Trans., vol. 155, 

 1865, p. 438. — H. B. Brady, Parker, and Jones, Trans. Linn. Soc, vol. 27, 

 1870, p. 231, pi. 40, figs. 15a-c.— H. B. Brady, Rep. Voy. Challenger, Zo- 

 ology, vol. 9, 1884, p. 566, pi. 72, figs. 12-15.— Flint, Rep. U. S. Nat. Mus., 

 1897 (1899), p. 319, pi. 67, fig. 4.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 3, 

 1913, p. 90, pi. 38, fig. 1. 



This species is by far the most abundant in the region, both in the 

 number of stations at which it was obtained as well as in its indi- 

 viduals at different stations. It is especially abundant at many 

 stations less than 100 fathoms in depth, ranging from 17 to 88 

 fathoms (31 to 161 meters), averaging 37 fathoms (68 meters). At 

 the following stations it occurred at more than 100 fathoms (183 

 meters): D5315, China Sea, vicinity of Formosa, 148 fathoms (271 

 meters), bottom temperature 54.4° F. (12.4° C); D5580, vicinity of 

 Darvel Bay, Borneo, 162 fathoms (297 meters), bottom temperature 

 55.8° F. (13.2° C); D5268, Verde Island Passage and Batangas Bay, 

 170 fathoms (311 meters), bottom temperature not given; D5282, 

 China Sea, vicinity of southern Luzon, 248 fathoms (454 meters), 

 bottom temperature 47.4° F. (8.5° C); D5569, north of Tawi Tawi, 

 303 fathoms (554 meters), bottom temperature 52.3° F. (11.2° C.) ; 

 D5172, vicinity of Jolo, 318 fathoms (582 meters), bottom tempera- 

 ture not given; D5318, China Sea, vicinity of Formosa, 340 fathoms 

 (622 meters), bottom temperature not given. 



This is very clearly a species of tropical coral reefs. A peculiar 

 specimen of PolymorpMna species is shown on plate 52, figure 5. 



