60 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



aperture slit-like, at the inner basal margin of the chamber, pro- 

 tected by a valvular lip; early chambers reddish brown, the later 

 yellowish brown; area of attachment light gray. 



Diameter 0.50-0.65 mm. 



Distribution. — The only record for this species in the North Pacific 

 is that given by Brady from near the Philippines, in 95 fathoms. 

 I have not met with the species in the material which I have examined. 



Genus CHRYSALIDINA d'Orbigny, 1846. 



Chrysalidina d'Orbigny (type, C. gradata d'Orbigny), For. Foss. Vienne, 

 1846, p. 194.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, 

 p. 387. 



Description. — Test many chambered, triserial, at least in the early 

 portion, tapering; apertures numerous, scattered over the ter- 

 minal wall of the chamber; other walls also porous. 



This genus includes two species, one a fossil from the cretaceous of the 

 Vienna basin, the other a very rare recent species occurring in shallow 

 water in the warmer portion of the Pacific and Indian Oceans. 



It is rather probable that these two species are not generically 

 related, but until more is known about them they may be considered 

 as belonging to one genus. 



CHRYSALIDINA DIMORPHA H. B. Brady. 



Chrysalidina dimorpha H. B. Brady, Quart. Journ. Micr. Sci., vol. 21, 1881, 

 p. 54; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 388, pi. 46, figs. 20, 21.— 

 Egger, Abh. kon. bay. Akad. Wiss. Munchen, CI. n, vol. 18, 1893, p. 274, 

 pi. 6, figs. 47, 51 , 52.— Millett, Journ. Roy. Micr. Soc, 1900, p. 12, pi. 1, fig. 14. 



Description. — Test free, elongate, tapering, triangular in cross sec- 

 tion, the sides nearly equal, somewhat concave, the edges slightly 



carinate ; early portion 

 acute, consisting of cham- 

 bers arranged t riserially, 

 the later portion com- 

 posed of chambers ar- 

 ranged in a single series; 

 wall hyaline, perf orate; 

 apertures numerous on 

 the broadened terminal 

 face of the chamber. 



Length about 0.50mm., 

 diameter about 0.25 mm. 

 Distribution. — Tins species is known from the warmer portions of 

 the Pacific and Indian Oceans, almost entirely from shallow water or 

 from shore sands. The only published North Pacific records are given 

 by Brady: Coral reef of Honolulu, in 40 fathoms- Hongkong Harbor, 

 in 7 fathoms. 



Figs. 90-97.— Chrysalidina dimorpha. X 70. 97, a, front 



VIEW; b, APERTURAL VIEW (AFTER BRADY). 



