76 BULLETIN 161, UNITED STATES NATIONAL MUSEUM 



Test forming a very low, compressed, trochoid spiral of only about 

 iy 2 to 2 whorls, the earliest portion in the microspheric form with 

 the chamber following the proloculum, making about one complete 

 coil, followed by an adult whorl, in which there are from 5 to 6 cham- 

 bers on the dorsal side, the coils very slightly if at all overlapping, on 

 the ventral side the central portion slightly umbilicate, the last- 

 formed whorl making up most of the surface on the ventral side, 

 periphery broadly rounded; wall thin, translucent, bluish white; 

 aperture circular, formed by the open end of the last-formed chamber. 

 Diameter, 0.25 mm. ; thickness, 0.05-0.07 mm. 



Millett's types of this species are from the Malay Archipelago, and 

 there are records for it, references to which are given above, from 

 the Kerimba Archipelago (Heron- Allen and Earland) ; off New Zea- 

 land, off Samoa (Cushman) ; Lord Howe Island (Heron-Allen and 

 Earland). Rather typical specimens occurred in our material from 

 Port Lotten, Kersail, Caroline Islands, and from Guam Anchorage, 

 Ladrone Islands, in 21 fathoms. 



FISCHERINA HELIX Heron-Allen and Earland 



Plate 17, Figures 5 a-c 



Fischerina helix Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 

 20, pt. 17, p. 591, pi. 46, figs. 10-14, 1915; British Antarctic Expedition, 

 Zoology, vol. 6, p. 73, 1922. 



Test forming a definite trochoid spiral of 4 or 5 volutions, pe- 

 riphery broadly rounded, whorls with about 3 or 4 chambers to each ; 

 sutures flush with the surface except the spiral suture, which is 

 somewhat depressed; wall very thin, fragile, opalescent; aperture 

 formed by the open end of the last-formed chamber. Diameter, 

 0.25-0.3 mm. ; height, 0.18-0.2 mm. 



Heron-Allen and Earland described this species from the Kerimba 

 Archipelago off southeast Africa, and also recorded it from a 

 dredging off the Poor Knights Islands, New Zealand. The only 

 material I have had in these present collections is 40 to 50 fathoms 

 off Fiji. 



FISCHERINA INVOLUTA, new species 



Plate 17, Figures 6 o-c 



Test nearly planispiral and almost completely involute on both 

 sides; chambers somewhat indistinct, three or four in the final 

 whorl ; sutures sigmoid on the ventral side, on the dorsal side radial, 

 flush with the surface ; wall very thin, fragile ; aperture semicircular, 

 formed by the open end of the last-formed chamber. Diameter, 

 0.3-0.35 mm. ; thickness, 0.2 mm. 



