538 
THE VOYAGE OF H.M.S. CH ALLEN GEE. 
Cristellaria compressa, d’Orbigny (PL CXIY. figs. 15, 16). 
Marginulina arcuata , (?) Philippi, 1843, Tert.-Verstein. nordwest. Deutsch., p. 5, pi. i. fig. 28. 
Cristellaria compressa, d’Orbigny, 1846, For. Foss. Vien., p. 86, pi. iii. figs. 32, 33. 
„ arguta, Reuss, 1855, Sitzungsb. d. k. Akad. Wiss. Wien, vol. xviii. p. 235, pi. iii. fig. 37. 
„ arcuata, Id. Ibid. p. 233, pi. iii. figs. 34-36. 
„ „ Id. 1864, Ibid. vol. 1. p. 463, pi. ii. figs. 9-11. 
Philippi, in his memoir on the Tertiary fossils of North- Western Germany, described 
and figured a considerable number of Foraminifera, chiefly Nodosarince; and his drawings, 
though too small and ill-defined to be of much value, derive a certain amount of import- 
ance from the attention bestowed upon them by subsequent writers. Amongst them are 
five figures of complanate Cristellarians, named respectively, “ Marginulina ( Planularia f) 
spirata, Marginulina (PI. f) arcuata, Marginulina (PI. ?) compressiuscula, Planularia 
intermedia, and Planularia semicircularis,” (op. cit., pi. i. figs. 27, 28, 29, 38, 39), 
which were subsequently treated by Reuss as individual modifications of a single 
species, under the general name Cristellaria arcuata. It is to be regretted that out of 
the five specific names above quoted this in particular should have been selected, 
inasmuch as it had previously (in 1846) been employed by d’Orbigny for a different 
species of the same genus. 
So far as the recent specimens are concerned, Philippi’s figures are of little importance, 
and might have been passed over without remark, were it not that Reuss’s illustrations 
of the same species embody the minor characters in which they were deficient, and are 
easily associated with the still living forms. Nevertheless, the d’Orbignian use of the 
specific term as applied to Cristellaria takes precedence, and the next available name for 
the variety under consideration appears to be Cristellaria compressa, from the “ Vienna 
Basin” monograph. 
The test of Cristellaria compressa is long, narrow, arcuate, and compressed or 
complanate ; the peripheral edge is thin and partially carinate ; the spiral commencement 
is evolute and distinct, and the later segments are long and obliquely set or nearly erect. 
The shell often attains a length of ^th inch (6 - 3 mm.), or more. 
Amongst the recent specimens are some (PL CXIV. fig. 15) which correspond pretty 
accurately with d’Orbigny’s figure ; whilst others (fig. 1 6) are relatively broader, and 
have a larger spiral commencement. From the latter it is easy to construct a gradational 
series uniting Cristellaria compressa with Cristellaria reniformis. 
As a living organism the species is not uncommon in the North Atlantic, at depths 
ranging from 300 to 1.000 fathoms, but has not been met with elsewhere. 
In the fossil state it has been found in various Tertiary deposits of Germany, Austria, 
.and Hungary. 
