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THE VOYAGE OF H.M.S. CHALLENGER 
Gaudryina subrotundata, Schwager (PL XLVI. fig. 13, a.b.c). 
Gaudryina subrotundata, Schwager, 1866, Novara-Exped., geoL Theil, vol. ii. p. 198, pi. iv. fig. 
9, a.b.c. 
„ prcelonga, Karrer, 1877, GeoL K. F.-J. Wasserleitung, p. 374, pi. xvi.a, fig. 6. 
Schwager’s figure of Gaudryina subrotundata represents a long, sub-cylindrical, 
somewhat compressed shell, less than a millimetre in length ; whilst Karrer’s drawing 
of Gaudryina prcelonga is taken from a rough test, nearly circular in transverse section, 
and of much larger dimensions. They appear, however, to belong to the same species ; 
one which, like many other Textularince, is subject to a good deal of variation, not only 
in the size and degree of compression of the test, but also in the texture of the walls. 
Recent specimens furnish almost every intermediate condition ; that figured in PI. XLYI. 
fig. 13, for example, presents characters just about midway between the two forms 
referred to. Karrer states that in one locality fossil specimens of Gaudryina prcelonga 
attain a length of 4 mm. ; living examples are not quite so large, but sometimes measure 
nearly 3 mm. 
Gaudryina subrotundata occurs off Culebra Island, West Indies, 390 fathoms, and 
off Raine Island, Torres Strait, 155 fathoms, the specimens being much larger in the 
former than in the latter locality. 
As a fossil it has been found in the Miocene beds of Baden near Vienna (Karrer), and 
in the Pliocene of Kar Nicobar (Schwager). 
Gaudryina Jiliformis, Berthelin (PI. XLVI. fig. 12, a.b.c.). 
Gaudryina jiliformis, Berthelin, 1880, M&n. Soc. geol. France., ser. 3, vol. i. No. 5, p. 25, pi. i. 
fig. 8. 
„ „ "Wright, 1882, Proc. Belfast Nat. Field Club (1880-1881), App. p. ISO, 
pi. viii. figs. 3, 3 a. b. 
This is a long slender variety, the dimorphous character of which is not always 
apparent at first sight. The triserial chambers are few in number and somewhat obscurely 
arranged, the Textularian segments very numerous and generally distinct. Tropical 
specimens often present the elegant contour shown in PI. XLVI. fig. 12; in those from 
other sources the test is less attenuated and less neatly constructed. 
Gaudryina Jiliformis has been taken at four Challenger Stations, namely: — off Sombrero 
Island and off Culebra Island, West Indies, 450 fathoms and 390 fathoms respectively; 
off Kandavu, Fiji, 610 fathoms, and off Tahiti, 620 fathoms and 420 fathoms. Small 
specimens have been collected in shallow water on the shores of Ireland and Scotland, by 
Messrs. Wright, Balkwill, and Robertson. 
The examples originally described by Berthelin were from the Cretaceous system 
(Gault) of the north of France. 
