696 MESSES. E. HEEON- ALLEN AND A. EARLAND ON THE 



357. Biscorbina allomorpMnoides (Eeuss). 



VahiiHno. allomorjjhino'ides Reuss, 1860, WK. p. 223, pi. xi. fig. 6. 

 Discorhina allomorphinoides Brady, 1884, FC. p. 654, pi. xci. figs. 5, 8. 



Vulvulina allomorjihinoides Egger, 1899, KOA. p. 43, pi. ii. figs. 4, 5. 

 Pulvimdina allomorphinoides Fornasiiii, 1900, PA. p. 394, fig. 44. 

 DiscorUna allomorphinoides Millett, 1898, etc., FM., 1903, p. 703. 



2 Stations. 



Very rare. The specimens are small, but otherwise quite typical. 



358. Biscorbina saiilcii (d'Orbiguy). 



Rosalina saulcii d'Orbigny, 1839, FAM. p. 42, pi. ii. figs. 9-11. 

 Discorbiiia saulcii Jones & Parlier, 1872, FFR. p. 115. 



„ Brady, 1884, FC. p. 653, pi. xci. fig. 6. 

 „ Chapman, 1900, FLF. p. 190. 

 „ Egger, 1893, FG. p. 392, pi. xv. figs. 51-53. 

 „ „ Heron-Allen & Earland, 1908, etc., SB. 1909, p. 411. 



Sidebottom, 1910, RFBP. p. 26, pi. iii. fig. 11. 



2 Stations. 



Very rare, only a few specimens at the two stations. 



359. Discorbma remiormis, sp. n. (Pi. LII. figs. 7-14.) 



5 Stations. 



Test smooth and ranging from reniform (or kidney-shaped) to nearly circular. 

 Sutnral lines flush with the surface, and hardly distinguishable, excepting in a few 

 specimens, where, owing to the local absence of perforations, they are indicated by 

 faint lines in the shell-substance. Aperture, when visible, a curved slit in the middle 

 or slightly to one side of the edge of the test, where the final chamber abuts 

 upon the initial whorl. Surface somewhat coarsely punctate ; colour varying from 

 light brown to glassy white. Viewed as a transparent object in balsam the test is 

 seen to consist of about nine inflated chambers buried in, or enveloped with, an 

 abnormally thick shell-wall full of coarse perforations. It seems probable that the 

 \vall of the test continues to thicken with the growth of the shell, thus obliterating 

 the sutnral lines, which are hardly visible in large specimens unless viewed as trans- 

 parent objects in balsam. The chambers are arranged more or less symmetrically in a 

 spiral; the rotaline twist is in a few cases normally developed, but, as a rule, is so 

 slight that the spiral appears to be almost involute when examined on edge. The 

 whole aspect of the shell in such specimens distinctly suggests a Nonioiiina, but we 

 think the character of the orifice and the small degree of bilateral asymmetry sufficient 

 to indicate their relationship with Biscorbina, especially when a whole series of 

 specimens is considered, including individuals presenting a marked rotaline difference 

 between the superior and inferior faces. At the same time the species is of a very 



