10 I. Abschnitt: Peneroplis pertusus, Forskäl. 
Type—Peneroplis carinatus, d’Orbigny. 
Peneroplis carinatus, d’Orbigny, 1839, Foram. Amer. Merid., p. 33, 
pl: HE ae 778: 
Peneroplis dubius, Id. 1839, Foram, Cuba, p. 79, pl. VI. fies. 21, 22. 
g) Broad complanate variety, thin-shelledl and without superfieial striae, 
P1:-XINL." fee: 12) 12. 
Type—Peneroplis laevigatus, Karrer. 
Peneroplis planatus, var. laevigata, Karrer, 1868, Sitzungsb. d. k. 
Akad. Wiss. Wien, vol. LVII. p. 153, pl. IH. fie. 7. 
Über die Verbreitung von Peneroplis pertusus resumiert Brady: „The 
geographical distribution of the genus is very wide, and appears to be governed 
only by latitude and depth of water. It supplies some of the commonest 
Forammifera of the shallow-water margins of tropical and subtropical seas, as 
far north as the Mediterranean. Wherever Peneroplides abound, the wide varıation 
exists. ] am unable to concur in Dr. Carpenter’s statement that the Dendritine 
varieties are confined to tropical latitudes, and that the Spiroline forms replace 
the others in deep water („Introd.“, p. 92). D’Orbigny gives „the Mediterranean 
near Toulon‘“ as a locality for Dendritina, and the most beautiful specimens in 
my own cabinet, though they are not of large size, are from the opposite coast 
of Tripoli; and the so-called Spirolinae have been found with allied forms at 
every depth from 8 to 250 fathoms. To judge by the Challenger colleetions 
the smooth non-striate varieties (f. and g.) appear to affect the greatest depths. 
They oceur at Stations 24 and 33 (off Uulebra Island and oft Bermuda) in 390 
and 435 fathoms respectively; but as shells of precisely similar character have 
been met with near the Cape de Verde Islands, in the Gulf of Suez, and elsewhere, 
at from 10 to 15 fathoms, it is manifest that they afford no evidence of any 
general rule. The deepest Challenger dredging in which living shells of the 
ordinary striate forms have been found is from Station 174 A., off Kandavu, 
Fiji, 255 fathoms, and the material furnishes almost every variety from the 
longest to the widest. 'T'he fact however remains, these exceptional cases not- 
withstanding, that the home of Peneroplis is at depths of less than 30 fathoms. — 
The geological range of the species is limited to the Tertiary epoch. It is to be 
met with from time to time in shallow-water deposits from the Eocene of the 
neichbourhood of Paris to the Crag of our eastern counties, or probably to an 
even later geological period.“ 
Der nächste, vorliegender Studie zu Grunde gelegte Gegenstand ist also 
diese eine Species, Peneroplis pertusus. Sehen wir, wie sich unserer mono- 
