252 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



of growth and extending farther toward the umbiUcus, giving the 

 test a one-sided appearance; aperture in the last-formed chamber 

 with a tubular neck; wall smooth and unornamented. 



Diameter up to 2.5 mm. 



Distrihution. — Type specimen (U.S.N.M. No. 9140) from Alba- 

 tross station D5301, in 208 fathoms (381 meters), China Sea, vicinity 

 of Hongkong, bottom temperature 50.5° F. (10.2° C.) . It also occurred 

 at D5523, northern Mindanao, D5529, in 441 fathoms (812 meters), 

 between Siquijor and Bohol Islands, bottom temperature 53° F. 

 (11.8° C), and D5537, in 254 fathoms (465 meters), between Negros 

 and Siquijor, bottom temperature 53.5° F. (11.8° C). 



This species, while not distinguished by marks of ornamentation, is 

 nevertheless striking by its change of axis in later growth and conse- 

 quent helicoid appearance. 



Cristellaria helidnoides — Material examined. 



CRISTELLARIA ITALICA (Defrance). 



Plate 51, fig. 2. 



Saracenaria italica Defrance, Diet. Sci. Nat., vol. 32, 1824, p. 177; vol. 47, 1827, 



p. 344; Atlas, Conch., pi. 13, fig. 6. 

 CristelJnria (Saracsnaria) italica d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 293, 



No. 26; Modules, 1826, Nos. 19 and 85. 

 Cristellaria italica Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., 



ser. 3, vol. 16, 1865, pp. 21, 32, pi. 1, figa. 41, 42.— H. B. Brady, Rep. Voy. 



Challenger, Zoology, vol. 9, 1884, p. 544, pi. 68, figa. 17, 18, 20-23.— Cushman, 



Bull. 71, U. S. Nat. Mua., pt. 3, 1913, p. 78, pi. 33, fig. 3. 



Specimens of this species occurred in material from more than 30 

 Albatross stations within the area: In the China Sea; Sulu Sea; off 

 Romblon; Sogod Bay, southern Leyte; off Marinduque; east coast of 

 Mindanao; off Panay; off southeastern Mindoro; Palawan Passage; 

 both east and west coasts of Luzon; between Negros and Siquijor; 

 off Sibuko Bay, Borneo; Gulf of Tomini, Celebes; Gulf of Boni; and 

 Macassar Strait. 



These stations range in depth from 38 to 752 fathoms (70 to 1,375 

 meters), with the average depth 288 fathoms (526 meters). The 

 average bottom temperature was 50.2° F. (10.1° C). 



