686 
THE VOYAGE OE H.M.S. CHALLENGER. 
sunk, and usually marked by a number of conspicuously large perforations, sometimes 
by a few exogenous warts or tubercles. It is one of the largest of Rotaliform Foraminifera, 
specimens often attaining a diameter of ^tli inch (4 mm.), or even more. 
With tbe exception of a single point on the west coast of Patagonia, at which one or 
two small examples have been obtained, the known geographical distribution of Pulvinulina 
punctulata is limited to the North Atlantic, the Mediterranean, and the Adriatic. The 
large shell figured in PI. CIY. is from Station 24, off Culebra Island, West Indies, 390 
fathoms. The species has been collected off the Canaries, and at the “ Porcupine ” Station 
No. 25 (1869), depth 164 fathoms ; and it is tolerably abundant off the coast of Norway, 
at depths of 60 to 200 fathoms. 
Fine examples have been found in the Crag of Sutton, near Colchester (Jones, Parker, 
and Brady), in the Pliocene of Southern Italy (Seguenza), and in the Post-tertiary beds 
of Norway (Crosskey and Robertson). 
Pulvinulina concentrica, Parker and Jones (PI. CY. fig. 1 , a.b.c.). 
“ Hammonise subconicse tuberculatse seu tuberosse,” Soldani, 1789, Testaceograpbia, vol. i. pt. 1, 
p. 56, pi. xxxvii. fig. B. 
Pulvinulina concentrica (P. & J., Ms.), Brady, 1864, Trans. Linn. Soc. Lond., vol. xxiv. p. 470, 
pi. xlviii. fig. 14. 
„ „ Parker and Jones, 1865, Phil. Trans., vol. civ. p. 393. 
Discorbina vestita, Seguenza, 1880, Mem. R. Accad. dei Lincei, ser. 3, vol. vi. p. 148, pi. xiii. 
fig. 39. 
So far as I am aware, there is no published description of the present species, except a 
brief note by myself on some specimens dredged -off Shetland ( loc . cit.) ; but the 
manuscript name applied by Parker and Jones to one of Soldani’s figures has been 
generally accepted. 
The test of Pulvinulina concentrica resembles that of Pulvinulina punctulata in its 
depressed contour and in the form of the segments, its peculiar and very characteristic 
feature being a broad band of clear exogenous shell-substance bordering the chambers 
and concealing, to greater or less extent, their lateral faces. 
Pulvinulina concentrica occurs at two Challenger Stations in the North Atlantic, 
namely, off Bermuda, 435 fathoms, and west of the Azores, 1000 fathoms ; also, off 
Shetland, 75 to 90 fathoms; in the Faroe Channel, 155 fathoms; and off the coast 
of Norway, 15 to 40 fathoms; in the Bay of Biscay, and in the Mediterranean. The 
South Atlantic has furnished specimens from off Tristan dAcunha, 100 to 150 fathoms ; 
and the South Pacific, from off Kandavu, 210 fathoms; and off Raine Island, 155 
fathoms. 
Under the name Discorbina vestita, Seguenza has figured an unmistakable specimen 
of this species, obtained from the Miocene formation of Southern Italy. 
