REPORT ON THE FORAMINIFERA. 
357 
are found in every sea and at almost every depth hitherto explored. Its geological range 
is correspondingly extensive, for it is not only one of the earliest known types of fossil 
Foraminifera, hut one of the most abundant, occurring in nearly every microzoic deposit of 
marine origin from the Lower Carboniferous Limestones to the present time. 
Textularia folium, Parker and Jones (PL XLII. figs. 1-5). 
Textularia folium, Parker and Jones, 1865, Phil. Trans., vol. civ. pp. 370, 420, pi. xviii. figs. 19. 
„ ,, Moebius, 1880, Foram. Mauritius, p. 92, pi. viii. figs. 16, 17. 
This species has been studied by Parker and Jones and by Moebius, and little need be 
added to the account they have furnished of its structural features. By the former 
authors it is described in its external aspect (op. cit., p. 420), as “a very thin Textularia, 
with linear chambers, usually very unequal in their length, and forming a flat, pectinated, 
irregularly triangular or subrhomboidal shell.” 
Double specimens, such as that represented in PL XLII. fig. 5, are not uncommon. 
Prof. Moebius, who gives excellent figures of the species drawn on a somewhat large scale, 
remarks that out of sixteen specimens which he had obtained from the intestines of a 
Maretia planulata, four were in the double condition. He also states that, in each of the 
four, the larger shell of the pair had twice as many segments as the smaller one. This, 
however, is not an invariable rule, as may be seen by the example represented in 
PI. XLII. fig. 5, which was selected without reference to the feature in question. 
It is suggested by the same author that the union of two shells in the manner described 
may perhaps be due to sexual conjugation. But a similar phenomenon is very common 
in certain species of Discorbina, and I am disposed to regard it in either case as identical 
with a process that has been observed in some other Rhizopoda, the origin and history 
of which have been very satisfactorily traced by Gruber, in connection with Euglypha 
alveolata ; 1 namely, the production of a new individual by the gradual extension of 
a mass of protoplasm beyond the mouth of the parent test, and the subsequent division 
of the nucleus, an investing shell being formed as growth proceeds. 
The following is a list of the localities at which Textularia folium has been observed : — 
off East Moncceur Island, Bass Strait, 38 fathoms; off Raine Island, Torres Strait, 1 5 5 
fathoms; off Kandavu, Fiji, 255 fathoms; off Levuka, Fiji; Nares Harbour, Admiralty 
Islands, 17 fathoms; Honolulu Coral-reefs, 40 fathoms; — shore-sand, Melbourne (Parker 
and J ones) ; Mauritius (Moebius). 
Textularia inconspicua, n. sp. (PI. XLII. fig. 6, a.b.c.). 
Test short, subconical, compressed laterally ; distal end broadly elliptical, truncate 
or somewhat concave ; apex rounded. Segments few, about six in each series, placed 
1 “Der Theilungsvorgang bei Euglypha alveolata.” Jenaische Zeitschr., 1881, vol. xxxv. p. 431, pi. xxiii. 
(ZOOL. CHALL. EXP. PART XXII. — 1883.) Y 46 
