FOKAMINIFERA OF NOKTH PACIFIC OCEAN. 81 



Segments about 12 in number; long, narrow, slightly bent ; obliquely 

 set or nearly erect .' ' 



" Length^ inch (0.74 mm.)." 



Distribution. — Described and figured by Brady from specimens 

 dredged by the Challenger in 95 fathoms off the Philippines. The 

 specimens figured by Egger seem rather doubtfully the same as Brady's, 

 but the figures lack detail. 



VAGINULINA PROTUMIDA (Schwager). 



Plate 30, fig. 1. 



Nodosaria protumida Schwager, Novara Exped., Geol. Theil. vol. 2, 1866, p. 

 227, pi. 6, fig. 59. 



Description. — Test elongate, tapering, arcuate, early chambers 

 somewhat oblique, sutures indistinct, later chambers much inflated; 

 wall ornamented with numerous longitudinal raised costse, increasing 

 in number as chambers are added; apical portion very tapering; 

 aperture at the end of a long slender neck. 



Length about 3 mm. 



Distribution. — Schwager described this species from the Tertiary 

 of Kar Nicobar. The figured specimen is from Albatross station 

 D4966, off Japan in 290 fathoms, bottom temperature 44.1° F. 



Evidently this belongs to Vaginulina rather than Nodosaria. The 

 apertural neck in the figured specimen is broken, but otherwise it 

 agrees very well with Schwager' s figure. 



Genus FRONDICULARIA De France, 1824. 



Frondicularia De France (type, F. complanata De France), Diet. Sci. Nat., vol. 

 32, 1824, p. 178. 



Description. — Test compressed, in the adult consisting of chambers, 

 elongate and narrow, running back on either side of the test; wall 

 vitreous, finely perforate; aperture single, either radiate or sur- 

 rounded with a lip which is usually cut in a radial manner; surface 

 smooth or ornamented with costee; microspheric specimens with a 

 coiled development in the earlier chambers ; megalospheric specimens 

 without the coiled chambers as a rule. 



The genus Frondicularia is interesting in showing very clearly the 

 differences between the microspheric and megalospheric forms in the 

 same species. Formerly the coiled microspheric forms were called 

 Flabellina, but it has been shown that instead of generic differences 

 these early stages represent the complete phylogenetic development 

 seen in so many species only in the microspheric form. In the 

 megalospheric form with its much larger proloculum the coiled 

 chambers are few or are not developed at all. This difference in the 

 development is shown in the accompanying outline figures. 



