REPORT ON THE FORAMINIFERA. 
G95 
There need not be the least hesitation in assigning the Rotalina truncatulinoides of 
the “ Canaries,” and the Rotalina micheliniana of the “ Chalk of Paris,” to the same 
species ; and as the memoirs in which they are respectively described were published 
nearly simultaneously, 1 the question of actual precedence of nomenclature is not of much 
importance. Parker and Jones have preferred the name attached by d’Orbigny to the 
Cretaceous specimens, and later writers have followed their usage in this respect. 
Pulvinulina micheliniana represents the extreme development in one direction of the 
“ menardii ” series ; namely, that in which the superior or spiral face of the shell is flat 
and the inferior highly convex or subconical. It is the isomorph of Truncatulina 
refulgens, from which species it is for the most part readily distinguishable by the more 
or less excavated umbilicus, and the projecting apical margins of the later segments. 
Except at a single locality, just north of the equator, Pulvinulina micheliniana was 
not taken at the surface of the North Atlantic during the Challenger cruise. It was 
collected, however, amongst other pelagic organisms at three points in the South Atlantic, 
at four in the South Pacific, and at one in the North Pacific. 
The wide-spread geographical distribution of the species is evidenced by the following 
record of the occurrence of dredged bottom-specimens : — Arctic Seas — Baffin’s Bay and 
Smith Sound, as far north as lat. 79° 26' N. ; North Atlantic — thirty-eight Challenger 
and “Porcupine” Stations, depths 90 to 2740 fathoms; South Atlantic- — twelve 
Stations, 100 to 2475 fathoms; North Pacific — five Stations, 345 to 2950 fathoms; 
South Pacific — nineteen Stations, 15 to 2600 fathoms ; Southern Ocean — four Stations, 
50 to 1570 fathoms, as far south as lat. 46° 46' S. It is plentiful also in the 
Mediterranean and the Indian Ocean. 
As a fossil the species has been found in the Cretaceous formations of England 
(Ehrenberg, Jones and Parker), Ireland (Wright), France (d’Orbigny, Ehrenberg), 
Germany, Austria, and Bohemia (Reuss, Karrer), New Jersey (Ehrenberg), and else- 
where. It has likewise been obtained from the London Clay (Jones and Parker), and 
from the Pliocene and Post-tertiary formations of Southern Italy (Seguenza) ; but our 
knowledge of its occurrence in deposits of Tertiary age is manifestly incomplete. 
Pulvinulina umbonata, Reuss (PL CV. fig. 2, a.h.c.). 
Rotalina umbonata, Reuss, 1851, Zeitschr. d. deutsch. geol. Gesellsch., vol. iii. p. 75, pi. v. 
fig. 35, a.-c. 
Pulvinulina umbonata, Id. 1866, Denkschr. d. k. Akad. At iss. A\ r ien, vol. xxv. p. 206. 
„ „ Hantken, 1875, Mittheil. Jahrb. d. k. ung. geol. Anstalt, vol. iv. 
p. 77, pi. ix. fig. 8, a.-c. 
1 “ Nous avons publie, l’annee derni&re, trois ouvrages speciaux sur les Foraminiferes : 1 °. Un travail d’ensemble, 
descriptif et historique, et un Genera complet dans VHistoire naturelle de file de Cuba , de M. de la Sagra, avec le Faune 
locale des Antilles (1 volume in - 8 °., avec 12 planches in -fol.) ; 2 °. la Faune des lies Canaries, dans IHistoire naturelle 
des ties Canaries, par MM. Webb et Bertlielot ; 3°. la Faune de la craie blanche de Paris, dans les Memoires de la Societe 
geoloyique de France .” Foram. A.mer. Merid. (dated 1839 ), p. 1, footnote. 
