253 
Report on Foraminifera. By F. W. Millett. 
Reophax difflugiformis var. lagenarium Berfchelin, plate IV. fig. 8. 
Haplophragmium lagenarium Berthelin, 1880, Mem. Soc. Geol. 
Fr., ser. 3, vol. i. p. 21, pi. xxiv. fig. 2. Reophax difflugiformis 
Brady, 1881, Chall. Bept., p. 289, pi. xxx. figs. 1, 5. 
This variety, which tapers regularly from the base to the apex 
without a distinct neck, is so persistent, both geologically and geo- 
graphicalty, that it seems worthy of being treated separately. It is 
rather more abundant than the type, and occurs at the same Stations. 
The test is usually of a looser structure than that of the globose form. 
Reophax ampullacea Brady, plate IY. fig. 9. 
R. ampullacea Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi. 
n.s. p. 49. R. ampullacea (Brady) Chapman, 1892, Journ. B. Micr. 
Soc., p. 320, pi. v. fig. 2. 
In all the specimens the shell-wall is very thin, being composed 
of little more than a single layer of broad flakes from the shells of 
Mollusca and other organisms, cemented together at or near their 
edges. It is very abundant at several of the Stations. 
Elsewhere the species is of extreme rarity, the only 1 Challenger ’ 
Station being off Christmas Harbour, Kerguelen Islands, 120 fathoms. 
Chapman records it from the Gault of Folkestone, and says, “It occurs 
frequently in one stratum only, in zone xi., 1 2 ft. from the top.” 
Reophax pleurostomelloides sp. n., plate IV. figs. 10 and 10*. 
Test free, monothalamous, oval ; shell-wall thin and finely arena- 
ceous ; aperture a large crescent-shaped opening in a lateral depres- 
sion of the test near the apex. Length, 0 * 20 mm. 
This is an interesting isomorph of the genus Pleurostomella. 
The lateral depression varies considerably in size, sometimes occupying 
but a small space near the apex, at other times reaching almost to the 
base of the shell. Being monothalamous, with a single aperture, this 
species is assigned provisionally to the genus Reophax , from which, 
however, it differs in not having the aperture terminal. In regarding 
such forms as this and Nuhecularia dubia, it must be felt that, in the 
absence of any knowledge of the character of the cell-contents, great 
uncertainty must exist as to their real position in nature. 
It is not very abundant, but is found at several Stations in both 
Areas. 
Reophax fusiformis Williamson sp., plate IY. fig. 11. 
Proteonina fusiformis Williamson, 1858, Kec. For. Gt. Br., p. 1, 
pi. i. fig. 1. Reophax fusiformis (Will.) Brady, 1884, Chall. Kept., 
p. 290, pi. xxx. figs. 7-11. R. fusiformis (Will.) Brady, Parker, 
and Jones, 1888, Trans. Zool. Soc., vol. xii. p. 217, pi. xli. fig. 18. 
R . fusiformis (Will. ?) Haeusler, 1890, Ahhandl. schweiz. palaont. 
