REPORT ON THE FORAMINIFERA. 
543 
An interesting example of this species, found by Mrs. Shone of Chester in the 
estuary of the Dee, is represented in PL LXYIII. tigs. 1, 2. The shell -wall is thin, 
and the entire specimen is sufficiently transparent, mounted iu Canada balsam, to be 
examined by transmitted light. In the interior of three of the chambers are seen a number 
of minute calcareous shells — young individuals in their earliest stage of development, or, 
more correctly, in their first calcareous investment. They have the appearance of 
rounded or subangular cells, either single or with a second, smaller cell adhering to 
the surface. The larger individuals closely resemble the primordial segment of the 
parent test. The viviparous mode of reproduction amongst the Foraminifera, of which 
this is an illustration, is no new fact, having been observed in Spirillina by Ehrenberg 
and Strethill Wright, and in Rotalia by Max Schultze, many years ago. 
Cristellaria crepidula, affects comparatively shallow water and temperate latitudes, and 
is not abundant either in the Challenger or the “Porcupine” dredged material. It is found 
as far north as the Hunde Islands, Davis Strait (lat. 68° 50' N.), and is not uncommon 
at moderate depths on the shores of Norway, the British Islands, Belgium, and France ; 
it also occurs in the Mediterranean, and in the Adriatic. Specimens have been taken 
in the North Atlantic, at depths of 300 to 450 fathoms ; in the South Pacific, from 
6 fathoms to 580 fathoms; and at a single point in the North Pacific, 40 fathoms. At 
one locality only has it been met with at a great depth, namely, Station 346, in the 
tropical part of the South Atlantic, 2350 fathoms. 
Geologically speaking, the species dates back as far as the Lias, and its presence 
in the Chalk of Ireland, in the London Clay, and in various later Tertiary formations 
of Italy, Spain, and Austria is on record. 
Cristellaria acutauricularis, Fichtel and Moll, sp. (PL CXIV. fig. 17, a.b.). 
“Hammoniae subrotundse,” &c., Soldani, 1879, Testaceographia, vol. i. pt. 1, p. 61, pi. xlix. fig. X. 
Nautilus acutauricularis, Fichtel and Moll, 1803, 4’est. Micr., p. 102, pi. xviii. figs. g-i. 
Cristellaria navicula, d’Orbigny, 1840, M4m. Soc. g6ol. France, vol. iv. Mem. I. p. 27, 
pi. ii. figs. 19, 20. 
„ polita, Reuss, 1855, Sitzungsb. d. k. Akad. Wiss. Wien, vol. xviii. p. 237, pi. iii. 
fig. 41. 
Robulina limbata, pars, Bornemann, 1855, Zeitschr. d. deutsch. geol. Gesellsch., vol. vii. p. 335, 
pi. xv. figs. 4, 5. 
Cristellaria acutauricularis, Parker and Jones, 1860, Ann. and Mag. Nat. Hist., ser. 3, vol. v. 
p. 114, No. 20. 
This is a thick ovoid variety, with broad, nearly flat, septal face ; a passage-form 
between Cristellaria crepidula or Cristellaria gibba on the one hand, and Cristellaria 
arcuata or Cristellaria italica on the other. 
Cristellaria acutauricularis is not very common in the recent condition. Specimens 
