404 
ME. W. K. PAEKEE AND PEOFESSOE T. E. JONES ON SOME 
Polystomella crispa, Linn., sp., Var. (Nonionina) stelligera , D'Orb., sp. Plate XIV. figs. 
40, 41 (Arctic). 
This delicate and variable Nonionina was first described by D’Okbigny as occurring at 
the Canaries (For. Canar., p. 123*, pi. 3. figs. 1, 2). It differs from N. asterizans in 
being altogether more delicate and feeble, and in the exogenous matter having the form 
of a radiating series of thin flaps, which cover over the inner half of the septal sulci on 
each face of the shell. 
It inhabits shallow waters of the Atlantic and the Australian coast. We find it in 
the dredgings from the Hunde Islands, throughout, from 25 to 70 fathoms, and in the 
mixed sands from Norway. 
Polystomella crispa, Linn., sp., Var. ( Nonionina ) Scapha, Fichtel and Moll., sp. Plate 
XIV. figs. 37-38 (Arctic); Plate XVII. figs. 55, 56 (North Atlantic). 
In this, almost the lowest form of Nonionina (the small and more or less oblique 
N. turgida being still feebler), the successive chambers enlarge at a greater ratio than 
they do in N asterizans and its allies ; hence the shell is ovato-oblong instead of discoidal ; 
it has the shape of the Argonauta, instead of that of the Nautilus. It is N communis , 
D’Orb. The shell varies from the complanate condition (fig. 37) to the gibbose (fig. 38), 
and to the subglobose (figs. 55, 56) ; occasionally faint traces of the septal fossettes 
characteristic of Polystomella can be recognized (fig. 38 a) ; but the aperture is still a 
simple arch-like slit (fig. 38 b) ; whilst in the next stage (N. Faba , fig. 36) the fossettes 
and the barred aperture occur together. 
N. Scapha occurs in warm seas rarely at great depths ; it is found in the British seas ; 
and the Arctic dredgings show that it also lives at high latitudes. It occurs in Baffin’s 
Bay at lat. 75° 10', long. 60° 12', rare and of middling size; lat. 76° 30', long. 77° 52', 
at 150 fathoms, very common and of middling size. At the Hunde Islands it is 
abundant at from 25 to 70 fathoms, sometimes of large size, usually middling. 
It abounds in many Tertiary deposits, Grignon, Bordeaux, Subappennines, San 
Domingo, English Crag, &c. 
Plate XVII. figs. 55, 56 (North Atlantic). 
Nonionina Scapha is rare and small at 225 fathoms on the Irish plateau of the North 
Atlantic; absent apparently in the central area; rare and of middle-size at 145 fathoms 
north of the Bank; very rare and middling at 161, 329, and 725 fathoms, and very 
rare and very small at 954 fathoms along the same tract ; in Trinity Bay it is rare and 
middle-size at 124, 133, and 150 fathoms. 
The very gibbose specimen, figs. 55, 56, is the same as N Labradorica , Dawson 
(Canad. Geol. Nat. vol. v. 1860, p. 192, fig. 4), found by him both recent in the Gulf 
of St. Lawrence and fossil in the Post-pliocene clays of Labrador and Maine. 
* In the text the name given is “ stelligera,” in the Plate it is “ stellifera ” ; of course the former should be 
received. 
