TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 51 



The figured specimens show the type of this species as developed 

 in our material. It occurs most abundantly in shallow water from 

 which we have specimens from Levuka, Fiji, 12 fathoms; Viva 

 Anchorage, Fiji, 3 fathoms; Kotonga, 7 fathoms; and Makemo 

 Lagoon, Paumotu Islands. Specimens from the last locality are very 

 small, and may represent the young stages, and the few specimens 

 from the two Albatross stations given in Table 28 are also very small 

 and immature. 



ELPHIDIUM ADVENUM (Cushman) DEPRESSULUM, new variety 



Plate 12, Figures 4a, 6 



Variety differing from the typical in the umbilical region, which is 

 depressed and without a definite boss, occupied by a few large pits, 

 the periphery more lobulate and much sharper, with a more distinct 

 keel; chambers fewer, broader, and somewhat more inflated. 



Holotype of variety. — Cushman Coll. No. 15670, from Vavau An- 

 chorage, Tonga Islands. 



It is common at the type locality, and also in 7 fathoms, Rotonga, 

 and 3 fathoms, Viva Anchorage, Fiji. This variety seems to be rather 

 easily distinguished in the collections we have had, and apparently is 

 at least varietally distinct. 



ELPHIDIUM RETICULOSUM, new species 



Plate 12, Figures 5a, b 



Test compressed, umbilical region excavated, periphery broadly 

 rounded, in side view the later portion strongly lobulate, no definite 

 keel developed; chambers increasing in size as added, rather rapidly 

 in the last-formed portion, and becoming much inflated; sutures 

 distinct, depressed, especially in the later portion, retral processes in 

 the early portion occupying a large part of the chamber width, in 

 the later portion very much reduced in relative size on account of 

 the great increase in the width of the chambers; wall ornamented 

 by peculiar depressions of the surface, forming a very fine network 

 or reticulation; aperture formed by numerous small pores at the 

 base of the apertural face. Diameter, 0.55 mm; thickness, 0.18 mm. 



Holotype. — Cushman Coll. No. 15671, from Vavau Anchorage, 

 Tonga Islands, in 18 fathoms. 



The species also occurs in typical form at Rotonga in 7 fathoms. 

 The wall of this species is very peculiar in its ornamentation. It is 

 a very fine network of irregular pattern entirely covering the inflated 

 chambers. It is hardly to be confused with any other of the species 

 from the South Pacific. 



