FAMILY 1. FORAMINIFERA. 291 
dritina, Peneroplis, Spirolina, Robulina, Cristellaria, Nonionina, Nummu- 
lina and Siderolina under the title of ‘‘Les Nautiloides.” 
The characters which have been assigned to the Polystomell are, that 
they have a discoidal somewhat turbinated shell, with generally a regular 
spire, which is more or less prominent, with the whorls contiguous, and 
the chambers irregularly divided. 
The following species are selected, one from each of D’Orbigny’s three 
sectional divisions : 
Examples. 
Pl. CCXCVIL. Fig. 7. 
PotystoMeLLa Canariensis, Nobis. 
Globigerina Canariensis, D’Orbigny, Mollusques des Iles Canaries, pl. 2. 
f. 10 to 12. 
Pl. CCXCVII. Fig. 8. 
PoLystoMELLA vutearis, Nobis. 
Planorbulina vulgaris, D’Orbigny, Tableau Méthodique des Céphalo- 
podes, p. 114. Foraminiféres de Cuba, p. 85. Foraminiféres des 
[les Canaries, pl. 2. f. 30. 
Pl. CCXCVII. Fig. 9. 
PoLysTtoMELLA coMPLANATA, D’Orbigny, Mollusques des Iles Canaries, 
Foraminiferes, pl. 2. f. 35. 
TEXTULARIA, Defrance. 
Testa plerumque elongata, subconica, loculorum seriebus duabus alter- 
natis subangulatim composita. 
The genus Textularia may be regarded as the type of D’Orbigny’s 
family of ‘‘ Les Enallostegues,” and the most suitable therefore for repre- 
senting the several groups into which that division is subdivided. They 
are ten, as follows: Bigenerina, Guttulina, Textularia, Vulvulina, Dimor- 
