216 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Genus FRONDICULARIA Defrance, 1824. 



There is a considerable development of this genus in the general 

 region of the Philippines, probably better than in most recent gather- 

 ings, unless in the Challenger material dredged off the Ki Islands. 



FRONDICULARIA INAEQUALIS Costa. 



Plate 40, figs. 5, 6. 



Frondicularia inaequalis Costa, Mem. Accad. Sci. Napoli, vol. 2, 1855, p. 372, 

 pi. 3, fig. 3.— n. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 521, 

 pi. 66, figs. 8-12. 



Description. — Test compressed, irregularly elliptical, initial end 

 usually narrow, bluntly pointed, proloculum subspherical, following 

 chambers coiled in part or not at all, quickly giving place to typical 

 V-shaped frondicularian chambers, highest in the center, thence 

 gradually tapering to the pointed lower ends; test occasionally with 

 a slight peripheral keel; sutures slightly depressed; aperture circular 

 in the center of the periphery of the last-formed chamber; surface 

 of test smooth and unomamented; wall translucent, thin. 



Length 0.5 to 2 mm. 



Distribution. — This delicate species has been previously recorded 

 from the Atlantic and South Pacific, but not from the North Pacific. 

 In the South Pacific, Brady in the Challenger Report recorded it 

 from off New Zealand, 275 fathoms (503 meters); off Raine Island, 

 Torres Strait, 155 fathoms (283 meters), and near the Ki Islands, 

 129 and 580 fathoms (236 and 1,061 meters). The two latter locali- 

 ties have already been mentioned as faunally closely related to the 

 Philippines, so that it is natural to find F. inaequalis in this Philippine 

 material. It has occured at D5123, east coast of Mindoro, in 283 

 fathoms (517 meters), bottom temperature not given; and D5652, 

 Gulf of Boni, 525 fathoms (927 meters), bottom temperature 41.2° F. 

 (5.1° C). 



Frondicularis inaequalis — Material examined. 



FRONDICULARIA PHILIPPINENSIS, new species. 



Plate 39, figs. 1-3. 



Description. — Test much compressed, comparatively large, roughly 

 diamond-shaped, initial end bluntly pointed, the greatest breadth 

 usually at about the lower third or fourth of the length, basal end 



