GOES: FORAMINIFERA. fil 
Is an intermediate form between lobatula and ariminensis, and sometimes dif- 
ficult to distinguish from the former ; it seems to take its highest development 
at about 1000 fathoms depth. Its segments are mostly narrow, but in less 
developed samples their breadth and number approximate to that of lobatula. 
Pacific. 695-1201 fathoms. Not scarce. 
Caribbean Sea. 789-1630 fathoms. Not scarce, but less developed. 
P. Ungeriana v’Ors. 
Rotalia Ungeriana pD’ORB., 1846, For. Bass. tert. Vienne, p. 157, Pl. VIII. Figs. 16-18 
(more flat). 
Planorb. Ungeriana Gos, 1882, Ret. Rhiz. Caribb. Sea, Sv. Vet. Ak. Hdl., XIX. 4, 
p. 100, Pl. VII. Figs. 234-236. 
Truncatulina Ungerianu Br., 1884, Chall. Rep., IX. p. 664, Pl. XCIV. Fig. 9. 
Planorbulina Ungeriana Gos, 1894, Arct. & Scand. Foramf., Sv. Vet. Ak. Hdl., XXV. 
9, p. 90, Pl. XV. Fig. 780. 
Planorbulina Ungeriana var. affixa Gods, 1882, Ret. Rhizop. Caribb. Sea, Sy. Vet. Ak. 
Hdl., Ibid., p. 108, Pl. VII. Figs. 287-241. 
Becomes in deep water of tropic seas more tumid and has the edge more 
rounded than the type represented by d’Orbigny, and also by Brady in his Shet- 
land Rhizopodes, Trans. Lin. Soc. London, XXIV. Pl. XLVIII. Fig. 12. Usu- 
ally it has a flat, often somewhat uneven or granulated boss on the centrum 
of the oral side, and also a small pellucid one on its aboral centrum ; but in 
starved specimens often one or the other is missing. Its principal features are 
the numerous segments of the last whorl (11-14), and the relative smallness 
of the pores. 
The Planorbulina (Rotalina) rosea of d’Orbigny can scarcely be specifically 
distinguished from our West Indian form; it has a somewhat elevated trochoid 
spire and affects shallower water in the Caribbean Sea. 
Planorb. Ungeriana has received a variety of names not only from different 
authors but also from one and the same author. 
It is sometimes affixed and assumes then a flat outspread shape, somewhat 
like lobatula, with strongly lobated edge (var. affiza Gods), Pl. VII. Figs. 1-3. 
Caribbean Sea. 196-966 fathoms; not scarce. 
ALLIED ForM :— 
P. mundula Brapy, Park. & Jonss. 
Truncatulina mundula Br., Park. & Jones, 1888, For. Abrohlos Bank, Trans. 
Zool. Soc. Lond., XII. 7, p. 228, Pl. XLV. Fig. 25. 
2 Brapy, Chall. Rep., IX. Pl. XCV. Fig. 6. 
Is not very distinct from Ungeriana, its main characteristics being its 
biconvex shape, with somewhat extenuated margin, the evoluted convolu- 
tions, the sutural limbation and plain poration of the aboral side; the 
number of segments in the outer whorl varying from 7 to 13. The oral 
