X 
THE VOYAGE OF H.M.S. CHALLENGER. 
The following is a complete list of the pelagic forms taken by means of the tow-net 
during the Challenger voyage. 
Globigerina bulloides, d’Orb. 
„ dubia , Egger. 
„ inflata, d’Orb. 
„ rubra, d’Orb. 
„ sacculifera, Brady. 
„ conglobata, Brady. 
„ cequilatercdis, Brady. 
Orbulina universa , d’Orb. 
Hastigerina pelagica (d’Orb.). 
Pullenia obliquiloculata, P. & J. 
Sphceroidina dehiscens, P. & J. 
Candeina nitida, d’Orb. 
Pulvinulina menardii (d’Orb.). 
„ tumida, Brady. 
„ canariensis (d’Orb.). 
„ crassa (d’Orb.). 
,, micheliniand (d’Orb.). 
,, patagonica ? (d’Orb.). 
Cymbalopora bidloides (d’Orb.). 
Ohilostomella ovoidea, Keuss. 
The claim of Chilostomella ovoidea to a place in the list is based upon a single 
specimen, the occurrence of which may have been due to accidental causes. 
Cymbalopora bulloides has only been met with near land in the neighbourhood of 
coral-reefs, and there is some doubt as to how far it is under all circumstances a pelagic 
species (see p. 639). Of Candeina nitida as a surface-form little can be said ; the specimens 
hitherto obtained, perhaps not more than half a dozen in all, are of very small size and 
thin-shelled. Some doubt also attaches to Pulvinulina patagonica, of which the 
examples are few, and lacking in distinctive features. These four species stand some- 
what apart from the rest of the category, and need not be further considered. 
Of the genus Globigerina the list includes all the more abundant recent species except 
Globigerina pachyderma, to which we shall presently revert. Globigerina dutertrei 
resembles the typical Globigerina bidloides too closely to be readily distinguished in 
balsam mountings ; and the absence of Globigerina digitata, which, though widely 
distributed as a bottom-species, is never found in large numbers, and of the other 
comparatively rare forms, is in no way remarkable. Orbulina is represented by the 
common Orbulina universa ; the thick-shelled Orbulina porosa with its reticulated exterior 
being only known by scarce bottom -specimens. 
Hastigerina is probably exclusively a pelagic genus, the bottom-specimens, wherever 
found, being manifestly dead shells, generally broken and invariably much altered in 
appearance. Of the Pidlenice, one species, Pullenia obliquiloculata , occurs not 
unfrequently at the surface, whilst the two smaller and much more widely dispersed 
forms, Pullenia sphceroides and Pullenia quinqueloba, are only known by dredged 
examples. Turning to Sphceroidina, the thick-shelled Sphceroidina dehiscens with its 
coarsely tubulated walls is found, though somewhat sparingly, at the surface, whilst the 
thin-shelled, finely porous Sphceroidina bulloides has never been collected in the tow-net. 
Lastly, Pulvinulina contributes at least five tolerably well-defined species to the surface- 
fauna, all pertaining to one section of the genus ; two of these, Pulvinulina crassa and 
Pulvinulina tumida, are comparatively rare, or at all events local in distribution, the 
