REPORT ON THE FORAMINIFERA. 
7S9 
years ago by the late Dr. Greville of Edinburgh, it was one of the most conspicuous 
Foraminifera, the specimens being of large size and comparatively plentiful. 
Polystomella craticulcita, Fichtel and Moll, sp. (PI. CX. figs. 16, 17). 
Nautilus craticulatus, Fichtel and Moll, 1803, Test. Micr., p. 51, pi. v. figs. h.-k. 
Cellanthus craticulatus, Montfort, 1808, Conchyl. System., vol. i. p. 206, 52 e genre. 
Vorticialis craticulata, Lamarck, 1822, Anim. s. Vert., vol. vii. p. 626, No. 1. 
Polystomella craticulata, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 284, No. 3. 
,, „ Carpenter, 1862, Introd. Foram., p. 279, pi. xvi. figs. 1, 2, &c. 
Helicoza craticulata, Moebius, 1880, Foram. von Mauritius, p. 103. 
Polystomella craticulata exemplifies to the fullest extent the typical features of the 
genus. The external characters of the test and its complicated internal structure have 
been very fully investigated by Carpenter (Joe . cit.). Moebius, also, more recently has 
published a brief account of the species, separating it generically from the other 
Polystomellce, on the ground of certain differences in the distribution of the interseptal 
canals, a course for which there appears no adequate reason, inasmuch as throughout the 
genus the canal system is a very variable feature, both in its nature and degree of 
development. The position to which the organism has been assigned by Carpenter and 
by Parker and Jones best expresses its natural relationship. It has been characterised by 
the latter authors as that form of Polystomella in which the “ canal system, theretral pro- 
cesses of the chambers, the septal bridges, and the apertural bars are all fully developed.” 
Carpenter states that specimens sometimes exceed ph inch (4 '2 mm.) in diameter. I 
have not myself met with anything so large, but shells of half that size are not uncommon. 
Polystomella, craticulata inhabits the shallow water of tropical and subtropical seas. 
Its area of distribution extends from the Levant southwards to the shores of Australia. 
It has been dredged in the Gulf of Suez, 15 to 30 fathoms; in the Red Sea; off the 
Mauritius ; on the Australian coral-reefs ; at ten Challenger Stations amongst the islands 
of the South Pacific, the depths ranging from 3 to 28 fathoms ; in the Chinese Sea ; 
in Hong Kong Harbour, 7 fathoms ; and off the Sandwich Islands, 40 fathoms. 
It is not known as a fossil species. 
Sub-family 3. Nummulitinse. 
Amphistegina, d’Orbigny. 
Amphistegina, d’Orbigny [1826], Bronn, Eeuss, Williamson, Ehrenberg, Carpenter, Parker and 
Jones, Karrer, Pourtales, Kaufmann, Moebius, Brady. 
Heterostegina, Nonionina, Ehrenberg [1855]. 
Hemistegina, Kaufmann, 1867. 
The genus Amphistegina was placed by d’Orbigny in his Family Entomostegues, 
which was characterised by “ chambers divided into many cavities by partitions or by 
