348 
THE VOYAGE OE H.M.S. CHALLENGER. 
the South Pacific, and he has more recently recorded the occurrence of the species in the 
Gulf of Manaar ; those in my own cabinet are from dredgings taken by the late Mr. 
M‘ Andrew in the Gulf of Suez, at a depth of 40 fathoms. 
Webbina, d’Orbigny. 
Webbina, d’Orbigny [1839], Terquem, Brady, Robertson, Blake. 
Tmchammina, pars, Jones and Parker [I860], Carpenter, Brady, M. Sars. 
Test adherent ; consisting of a single, convex, tent-like chamber, or of several such 
chambers connected by stoloniferous tubes. Texture very finely arenaceous; surface 
smooth, often polished ; colour, in recent specimens, reddish-brown. 
M. Cornuel’s interesting memoir on fossil microzoa from the Cretaceous beds of the 
Department of the Haute-Marne in France 1 contains excellent figures of two species of 
arenaceous Foraminifera, which were mistaken by the author for the ova of mollusca, 
and described accordingly. They represent, in point of fact, the typical forms of the 
adherent groups of the Lituolince and Trochammininoe respectively. Of one of them, 
Placopsilina cenomana, the description has already been given ; the other, which received 
from d’Orbigny two names, Webbina flexuosa and Webbina irregularis , 2 may be accepted 
as the type of the subordinate group we have now to consider. The genus Webbina 
had been established some years previously for a recent species, Webbina rugosa ; 3 but 
there is some doubt, to judge from the figure, whether the specimen on which it was 
founded was anything more than one of the rough adherent varieties of Nubecularia ; 
and in any case Cornuehs drawings afford a safer basis for generic definition. 
There are at least four well differentiated species or varieties of adherent Trocha/niminince, 
namely: — 1 , Webbina irregularis (including flexuosa), which may be regarded as the 
type, — a moniliform shell with distinct, oval chambers, more or less separated by the 
stoloniferous tubes, rarely branching ; 2, Webbina alternans, in which the segments are 
oval or pyriform, and the stolons issue from the two sides alternately, so that the shell 
has a somewhat Textularian character ; 3, Webbina clavata, usually consisting of a 
single oval chamber with a long adherent tubular process, the open end of which forms 
the aperture ; and 4, Webbina hemisphcerica, of which the test is circular and convex 
and without any oral tube. 4 Of these species, only the third and fourth require more 
detailed notice. 
In one form or other the genus Webbina is found living at every depth from about 
1 Mdm. Soc. Gdol. France , 1848, 2 e ser., vol. iii. pi. A. fig. 37. 
2 Prodrome de PaEontotogie, 1850, vol. ii. p. Ill, Nos. 782, 783’. 
3 Foram. Canaries, 1839, p. 125, pi. i. figs. 16-18. — For. Foss. Vien., p. 74, pi, xxL figs. 11, 12. 
4 Vide — Monogr.. Crag Foram., 1866, pt. i. p. 25. 
