186 
THE VOYAGE OE H.M.S. CHALLENGER. 
This beautiful species is more likely to be confounded with the Spiroline varieties of 
Peneroplis than with any of its more immediate allies, but it may be readily distinguished 
by the earlier chambers, which take the form of a little irregular oval knot instead of being 
symmetrically coiled in one plane. Its even unconstricted outline and flush sutures afford 
a further means of diagnosis. Prof. Costa, in the Paleontologia del regno di Napoli 
(p. 225, pi. xx. fig. 2, A.B. C. D.), describes and figures a very similar shell under the name 
Spirolina longissima. Whether this be in reality a Spiroline isomorph of the species 
under consideration, or a true Articulina with somewhat inflated segments, is very difficult 
to say ; two of the figures harmonise with the latter rather than the former supposition. 
Articulina funalis occurs at two points on the shores of Kerguelen Island — off Christ- 
mas Harbour, 120 fathoms, and Balfour Bay, 20 to 50 fathoms; off Prince Edward’s Island, 
50 to 150 fathoms ; and in Humboldt Bay, on the north coast of Papua, 37 fathoms. In 
the second of these localities it is especially abundant. 
Articulina funalis, var. inornata, nov. (PI. XIII. figs. 3-5). 
A few examples, differing from the typical Articulina funalis in their smooth non- 
striate exterior, occur in the material from Prince Edward’s Island. They probably re- 
present a mere local variety. 
Vertebralina, d’Orbigny. 
Lituus, Soldani [1789]. 
Renulites, Lamarck [1804], 
Renulina, pars, Blainville [1824]. 
Vertebralina, d’Orbigny [1826], Bronn, Williamson, Reuss, Carpenter, Parker, Jones and Brady, 
Karrer. 
The genus Vertebralina was designed by d’Orbigny to embrace those porcellanous 
species which are planospiral in the arrangement of their earlier chambers and rectilinear 
in the later ones ; whilst Articulina was intended for a parallel group in which the shell 
is distinctly Milioline (Tri- or Quinqueloculine) in the primordial stage and afterwards 
rectilinear. In the d’Orbignian classification these genera appear in different families, the 
former amongst the Helicostegues the latter with Agatliistegues. Of their close relation- 
ship, however, there can be no doubt, and it has been the custom of recent years to treat 
the whole in one series as Vertebralince, and to dispense with Articulina as a generic 
term. But if dimorphous forms of this sort are to receive generic recognition, it appears 
to me more convenient to acknowledge the distinction, in so far as to accept Vertebralina 
as representing the dimorphous modification of helicoid forms like Hauerina, and 
Articulina as the parallel condition of Miliolina. 
Vertebralina is best known as a recent genus ; the only record of its occurrence in 
the fossil condition is in the Renulites opercularia of Lamarck, a species peculiar to the 
Eocene of the vicinity of Paris. 
