24 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Nonionina asterizans, var. depressula Parker and Jones, Intr. Forarn., Appendix, 



1862, p. 310. 

 Polystomella crispa, var. (Nonionina) depressula Parker and Jones, Philos. 



Trans., vol. 155, 1865, p. 403, pi. 14, fig. 39a, 6. 



Description. — Test rounded in side view, ten to twelve chambers 

 visible in the last-formed volution, in apertural view with parallel 

 sides and broadly rounded angles, narrow, about 3J times as long as 

 broad; very slightly if at all depressed at the umbilicus; chambers 

 somewhat inflated and the sutures correspondingly depressed giving 

 a lobulated periphery; umbilical region with a slight tendency toward 

 filling in of shell tissue and a slight trace of stellate extension of this 

 material outward along the sutures ; aperture a narrow, arched slit. 



Diameter, 0.40-0.50 mm. 



Distribution. — The only previous records of this species in the 

 North Pacific are those given by Bagg, Albatross stations D 4025 in 

 275-368 fathoms, H 4430 in 1,544 fathoms, H 4440 in 1,259 fathoms, 

 and H 4566 in 572 fathoms, all off the Hawaiian Islands. I have had 

 material from Albatross station D 4974 in 905 fathoms, bottom tem- 

 perature 36.6° F. off Japan, and from the following Nero stations 

 between Japan and Guam, 1081 in 1,900 fathoms, 1184 in 1,542 

 fathoms, 1191 in 1,551 fathoms, 1295 in 1,415 fathoms, and 1,302 in 

 1,331 fathoms. 



NONIONINA UMBILICATULA (Montagu). 



Plate 17, fig. 1. 



Nautilus umbilicatulus Montagu, Teat. Brit., 1803, p. 191; Suppl., p. 78, pi. 18, 

 fig. 1. 



Nonionina umbilicatula Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., 

 ser. 4, vol. 8, 1871, p. 242, pi. 12, fig. 157.— Terrigi, Atti Accad. Pont. Nuovi 

 Lincei, vol. 35, 1883, p. 203, pi. 4, fig. 48.— H. B. Brady, Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 726, pi. 109, figs. 8, 9. — H. B. Brady, Parker, 

 and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 230, pi. 43, fig. 19.— Egger, 

 Abh. kon. bay. Akad. Wiss. Miinchen, CI. ii, vol. 18, 1893, p. 426, pi. 19, 

 figs. 36, 37.— Goes, Kongl. Svensk. Vet. Akad. Handl., vol. 25, 1894, p. 103, 

 pi. 17, fig. 823. — Chapman, Proc. California Acad. Sci., ser. 3 (Geol.), vol. 1, 

 1900, p. 256, pi. 30, fig. 15.— MrLLETT, Journ. Roy. Micr. Soc, 1904, p. 600.— 

 Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 165. — Sidebottom, Mem. and 

 Proc. Manchester Lit. and Philos. Soc, vol. 54, No. 16, 1910, p. 29, pi. 3, fig. 

 15.— Bagg, Bull. U. S. Geol. Surv., No. 513, 1912, p. 90, pi. 27, figs. 4-6. 



Nonionina umbilicata Terquem, Mem. Soc geol. France, ser. 3, vol. 2, mem. m, 

 1882, p. 42, pi. 2, fig. 7. 



Description. — Test composed of numerous chambers, deeply umbili- 

 cate, in face view slightly tapering, broadest at the latest formed 

 portion of the coil, about twice as long as broad, the periphery broadly 

 rounded; surface deeply and prominently pitted, sutures tending to 

 become limbate ; aperture a very narrow curved opening at the base 

 of the apertural wall of the chamber. 



Diameter, 0.50-0.70 mm. 



