280 Transactions of the Society. 



apex of the suture formed by the junction of the last added secondary- 

 chamber. 



The typical form is very abundant at Station 13, and is found, 

 though sparingly, at a few other Stations. 



The only ' Challenger ' Station is at Raine Island, Torres Strait. 

 Dr. Egger records it from seven ' Gazelle ' Stations extending from 

 West Africa to West Australia ; rare at all of them. 



Bulimina convoluta var. nitida var. n., plate II. fig. 10. 



This variety is almost purely Rotaliforrn, the secondary series ot 

 chambers being very small and often scarcely discernible. The 

 aperture, like that of the type, is situated at the superior junction of 

 the last added primary and secondary chambers, and is usually a 

 straight horizontal slit as figured. The shell substance is opaque and 

 lustrous, almost iridescent. 



The two forms occur together, but one or the other always pre- 

 dominates ; at Station 13 the type is abundant and the variety rare ; 

 at all the other Stations where they both occur, this is reversed. 



Pleurostomella Eeuss. 

 Pleurostomella contorta sp. n., plate II. figs. 11, 12. 



Test conical, slightly compressed, rounded at the oral, pointed at 

 the aboral extremity. Chambers short and inflated, arranged in two 

 parallel series, each of which overlaps the other on one side ; sutures 

 oblique and depressed. Aperture a transverse fissure in the septal 

 face of the terminal chamber, close to its junction with the last-formed 

 chamber of the opposite series. Length 0*45 mm. 



This is an anomalous species, and has little more than its flattened 

 septal face to indicate its affinity with the genus. In the young con- 

 dition, fig. 12, the characters are more marked than in the adult. 



It is by no means uncommon in the Malay Archipelago, and is 

 found at Stations in both Areas. 



Virgulina d'Orbigny. 



Virgulina Schreibersiana Czjzek. 



Virgulina Schreibersiana Czjzek, 1848, Haidinger's Naturwiss. 

 Abhandl, vol. ii. p. 147, pi. xiii. figs. 18-20. V. Schreibersii (Cz.) 

 Malagoli, 1887, Atti Soc. Nat. Modena, ser. 3, vol. iii. p. 108, pi. i. 

 fi.ir. 5. V. Schreibersiana (Cz.) Egger, 1893, Abhandl. k. bayer. 

 Ak. Wiss., CI. II. vol. xviii. p. 290, pi. viii. figs. 93, 95. V. Schrei- 

 bersiana (Cz.) Goes, 1894, K. Svenska Vet.-Akad. Handl., vol. xxv„ 

 p. 48, pi. ix. figs. 459, 461-472. V. Schreibersiana (Cz.) Fornasini, 

 1897, Rendic. Accad. Sci. Bologria, n.s. vol. ii. pi. ii. fig. 9. V. 

 Schreibersiana (Cz.) Fornasini, 1898, Mem. R. Accad. Sci. Istit. di 

 Bologna, ser. 5, vol. vii. p. 206, pi., fig. 6. V. Schreibersiana (Cz.) 



