68 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



CRISTELLARIA VORTEX (Fichtel and Moll). 

 Plate 32, fig. 3. 



"Nautili globuli" Soldani, Testaceographia, vol. 1, pt. 1, 1879, p. 66, pi. 59, 

 fig. tt. 



Nautilus vortex Fichtel and Moll, Test. Micr., 1803, p. 33, pi. 2, figs. d-i. 



Polystomella vortex Blainville, Man. de Malac, 1825, p. 389. 



Robulina vortex d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 288, No. 4. 



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

 4, vol. 8, 1871, p. 240, pi. 10, fig. 82.— H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 548, pi. 69, figs. 14-16.— Flint, Rep. U. S. Nat. Mus., 

 1897 (1899), p. 317, pi. 65, fig. 1— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, 

 p. 148. 



Description. — Test close coiled, biconvex, umbonate; chambers 

 elongate, curved, the sutures making a long curve from the periphery 

 to the umbo; peripheral margin acute but not distinctly carinate; 

 wall smooth. 



Length 1 to 1.5 mm. 



Distribution. — Bagg records this species from a single Albatross 

 station H4508 in 495 fathoms off the Hawaiian Islands. I have had 

 specimens from Albatross H3007 in 323 fathoms also off the Hawaiian 

 Islands and Nero station 990 in 859 fathoms off Guam. 



CRISTELLARIA CONVERGENS Bomemann. 



Plate 34, fig. 3. 



Cristellaria convergens Bornemann, Zeitschr. deutsch. Geol. Ges., vol. 7, 1855, 

 p. 327, pi. 13, figs. 16, 17. — H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 

 9, 1884, p. 546, pi. 69, figs. 6, 7. 



Description. — Test oval, biconvex, close coiled; chambers triangu- 

 lar, the last formed one drawn out to a point at the apertural end; 

 sutures hardly visible, the chambers embracing to the umbo; wall 

 smooth and thick. 



Length about 1 mm. 



Distribution. — Brady records this species at a single Challenger 

 station 224 in 1,850 fathoms in the North Pacific. I have had mate- 

 rial referable to this species from numerous stations, most of them 

 off Japan. It occurred at two Nero stations 1208 in 665 fathoms and 

 1213 in 808 fathoms off Yokohama and at numerous Albatross sta- 

 tions in the same region with a range of depth from 361 to 649 

 fathoms, the bottom temperatures ranging from 38.1° F. to 42.7° F. 

 The species also occurred at one Tuscarora station No. 58 in 814 

 fathoms, lat. 26° 52' N., and long. 142° 21' E. 



The most striking characters of tins species are the extension of the 

 alar projections laterally over the sides of the test with a consequent 

 obscuring of the sutural lines. 



