362 
ME. W. K. PAEKEE AND PEOFESSOE T. E. JONES ON SOME 
compressed than P. complanata, D’Orb. (For. Foss. Vien. pi. 13. figs. 25-30); the 
latter being the centre of the group of leaf-like forms. 
Fig. 47, though not so flat as D’Orbigny’s figure of P. compressa, comes nearest to it, 
of these before us. Fig. 48, somewhat Textularian in its make, connects P. compressa 
with D’Orbigny’s P. Thouini (Modele, 23): the latter, however, is still more elongate 
and less compressed. In the Crag of Suffolk this elongation advances to such an extent 
that the shell at first sight looks like a Dentalina : it has become the isomorph of the 
elongate Virguline Bulimvna of the English Gault and the German Planer-Mergel. 
Figs. 49 & 51 connect P. compressa with D’Oebigny’s P. Problema (Modele, 61). Fig. 50, 
composed of about three chambers, is a young or an arrested individual of the com- 
pressed type. 
At the Hunde Islands, 30-40 fathoms, these forms of P. compressa occur rare and 
small. From the Norwegian coast we have them, rather common and small, in the 
mixed sands. 
These are amongst the commonest forms of Polymorphina from the Lower Secondary 
period up to the Recent. 
Polymorphina lactea, Walker and Jacob, Var. tubulosa , D’Orbigny. Plate XIII. fig. 52 a-d 
(Arctic). 
This condition of P. lactea we have already spoken of. We may add that the tubular 
appendages are found on Polymorphinae of various shapes, but generally on the more or 
less spheroidal, or at least ovoidal, forms ; and it is only for the sake of convenience 
that it can be regarded as a subcentral group and distinguished by a binomial appella- 
tion. D’Orbigny’s figured and named specimen (For. Foss. Vien. pi. 13. figs. 15, 16) 
has priority among several. 
Fig. 52 a-c is from Bred Sound, Finmark (MacAndrew and Barrett), 30 fathoms. 
The fragment fig. 54 d is from some other part of the Norwegian coast. 
Tubulose individuals of P. lactea occur common in the Cretaceous deposits ; are very 
common in some of the Grignon and other Tertiary beds ; and are very large in the Crag 
of Suffolk (Mr. S. V. Wood’s Collection). In the Australian coast-sand (Melbourne) 
living individuals of large size are abundant; and fine specimens live in the Bay of 
Biscay (50-60 fathoms) and in the English Channel. One large and interesting speci- 
men that we have obtained in the shelly sand off Plymouth is adherent to a fragment 
of a bivalve shell ; its tubular arms spreading radially on the shell, like the wild-growing 
cells of a Planorbulina or of a Carpenteria. Professor Williamson figures a fine tubu- 
lose British Polymorphina (P. lactea , var. jistulosa , Monogr. fig. 150), and also a small 
plano-convex, crenately winged form (P. lactea , var. concava , fig. 151), which he regards 
(with much probability) as having been parasitic. We have met with similar forms in 
sands of shallow waters. 
