654 
THE VOYAGE OF H.M.S. CHALLENGER. 
latter particular is by no means confined to the present species, but may be noticed 
amongst allied forms. 
Discorbina saulcii occurs in two soundings off Tahiti, at depths of 420 and 620 
fathoms respectively. Fine well-characterised specimens were abundant in sand dredged 
by the late Mr. M'Andrew in the Gulf of Scala Nova, Levant, depth 100 fathoms. The 
habitat named by d’Orbigny is the shore-sand of Arica, Peru. 
Discorbina allomorphinoides, Reuss, sp. (PI. XCI. figs. 5, 8), 
Valvulina allomorphinoides , Reuss, I860. Sitzungsb. d. k. Ak. Wiss. Wien, vol. xl. p. 223, 
pi. xi. fig. 6. 
I think I am right in referring certain recent specimens, exemplified by the two figures 
5 and 8, to Reuss’s Cretaceous species ; and also in placing them amongst the Discorbina, 
notwithstanding the fine texture and minute perforation of the shell-wall, which suggest 
rather an affinity to Pulvinulina. Their connection with more typically constructed 
Discorbina is more easily traced in some specimens than others, and even when least 
apparent may generally be recognised by comparison with forms bearing intermediate 
characters. 
The specimens alluded to were collected at three localities, namely : — off the Philip- 
pine Islands, 95 fathoms; off Raine Island, 155 fathoms; and at Port Jackson, 2 to 
10 fathoms. 
The original Valvulina allomorphinoides of Reuss was from the Cretaceous formations 
of Westphalia. 
Discorbina ventricosa, n. sp, (PI. XCI, fig, 7, a.b.c.). 
Test free, oblong, rounded, more or less depressed ; composed of less than two 
complete convolutions, the outer whorl consisting of six or seven segments ; the successive 
segments increasing rapidly in length ; septal faces ventricose, especially that of the 
final chamber ; sutures excavated. Superior face hispid externally, inferior smooth ; 
umbilicus deeply sunk, valvular flaps but little developed. Diameter, about h^th inch 
(0‘5 mm.). 
The affinity of this little Foraminifer is somewhat obscure. If correctly assigned to 
the present genus, it may be ranked as a Discorbine isojnorph of Pulvinulina hauerii 
or oblonga. 
The best specimens occur in material dredged off Bermuda, 435 fathoms ; but similar, 
forms have been observed off Gomera, Canaries, 620 fathoms ; off the Azores, 450 
fathoms; and off Raine Island, 155 fathoms. 
