ME. W. K. PAEKEE AND PEOEESSOE T. E. JONES ON SOME 
Genus Bulimina. 
Bulimina Presli , Reuss, Var. Pyrula , D’Orbigny. Plate XV. figs. 8, 9 (Arctic). 
In describing the Bulimince that form part of the Rhizopodal Fauna of the Arctic 
and North Atlantic Oceans, we have not occasion to treat so largely of the special cha- 
racters of the genus, nor the relationships of the subspecific groups, as is necessary in 
the case of the Nodosarince , Lagenae, Polymorphince , JJmgerinae , Globigerince, Botcilince , 
and Polystomellce ; chiefly because these relationships and characters are not difficult to 
be understood, with the help of the figures before us, and because they have been clearly 
stated in Carpenter’s ‘ Introd. Foram.,’ p. 195, &c. 
As the best medium-form of the very variable Bulimince we take Reuss’s B. Presli 
(Verst. Bohm. Kreid. pi. 13. fig. 72 ; Haiding. Abhandl. iv. pi. 10. fig. 10; and Car- 
penter’s ‘ Introd.’ pi. 12. fig. 18). B. Pyrula , D’Orb. (For. Foss. Yien. pi. 11. figs. 9, 10), 
of which we have some Norwegian specimens before us, is one of the varieties (for we 
cannot see evidence of the existence of more than one species of Bulimina ) that have 
the greatest tendency to overlap their chambers, and so hide the primary segments by 
the later ones closing over them. It is usually prickled at the apex. 
We have it common and large in the mixed sands from the coast of Norway 
(MacAndrew and Barrett). It lives in the Mediterranean, and is large between Socotra 
and Kurachee. It is found fossil in the Vienna Tertiaries (where it is large) and the 
London Clay. A Bulimina of very similar shape occurs also in the Upper Triassic Clay 
of Chellaston, Quart. Journ. Geol. Soc. xvi. p. 457, pi. 20. fig. 45. 
Bulimina Presli, Reuss, Var. marginata, D’Orbigny. Plate XV. fig. 10 (Arctic); Plate 
XVII. fig. 70 (North Atlantic). 
The neat, little, acute-ovate Bulimince that next come under notice are characterized 
by the exogenous growth of shell-matter, in the form of prickles, on the primordial 
chamber (as in B. Pyrula also) and at the posterior edges of the other chambers to a 
greater or less degree. 
The edges of the chambers may be pinched up, crenulated, serrated, toothed, or spined ; 
the spines may be few or numerous along the sharpened border or on the surface of the 
chambers, and they may be present on all of them or limited to the earlier ones ; inter- 
mediate conditions in every respect being observable. No real division can be made 
amongst these modifications ; but for convenience-sake those edged with prickles are 
grouped under B. marginata , D’Orb. Ann. Sc. Nat. vol. vii. p. 269, No. 4, pi. 12. figs. 
10-12 ; whilst B. aculeata , D’Orb. (after Soldani), Ann. Sc. Nat. vol. vii. p. 269, No. 7, 
takes those with fewer spines. Williamson’s B. gmjpoides , var. spinulosa , Monogr. p. 62, 
pi. 5. fig. 128, has many fine long spines along the margins. The crenate and prickly 
margins are found associated with more contracted forms of Bulimince * than those 
* Such as B. pulcTiella, D’Orb. (For. Amer. Mer. p. 50, pi. 1. figs. 6, 7), a very small subcylindrical form, 
■with pincbed and fringed chambers ; living in the Pacific, from the equator to 34° S. lat. ; and B. Pcitagonicci, 
D’Orb. (Ibid. p. 50, pi. 1. figs. 8, 9), a very rare form (contracted and fringed at first, irregularly globuliform 
afterwards), found at the Bay of San Bias, Patagonia. 
