544 Transactions of the Society' 



trates the difficulty of treating the dimorphous forms under the 

 accepted system of classification, the simple and compound examples 

 finding places in different genera. 



It is by no means common in the Malay Archipelago. 



There are four ' Challenger ' Stations, all of which are near the 

 Island of Papua. The ' Gazelle ' localities are West Coast of Portugal, 

 Mauritius, and West Australia. 



Bolivina convallaria sp. n., plate IV. fig. 6. 



Test elongate, straight, tapering towards the aboral end, peripheral 

 edge lobulated ; chambers numerous, inflated, with the peripheral 

 margin rounded or acute ; basal margin greatly projecting, reflected, 

 and serrated. Sutures deeply sunk. Aperture large and variable in 

 form. Length 0*47 mm. 



This species varies greatly in the form and arrangement of the 

 chambers and in the shape and size of the aperture. It may be 

 described as resembling a much elongated Bulimina marginata, 

 in which the chambers are loosely arranged biserially. 



It is by no means common, but occurs at several Stations, mostly 

 in Area 2. 



Bolivina eenariensis Costa sp. 



Brizalina eenariensis Costa, 1856, Atti Accad. Pontaniana, vol. 

 vii. p. 297, pi. xv. fig. 1. Bolivina eenariensis Brady, 1882, Proc. 

 E. Soc. Edin.. vol. xi. p. 711- — Table. B. eenariensis (Costa) Brady, 

 Parker, and Jones, 1888, Trans. Zool. Soc, vol. xii. p. 221, pi. sliii. 

 figs. 2-5. B. eenariensis (Costa) Malagoli, 1888, Boll. Soc. Geol. 

 Ital., vol. vii. p. 377, pi. xiv. figs. 11, 12. B. nobilis (Hantken) 

 Terrigi, 1891, Mem. K. Com. Geol. dTtalia, vol. iv. p. 75, pi. i. 

 fig. 30. B. eenariensis (Costa) Flint, 1899, Kept. U.S. Nat. Mus. for 

 1897, p. 292, pi. xxxvii. fig. 8. 



In the Malay Archipelago typical specimens of this species are 

 very rare, but passage forms related to both B. robusta and B. nobilis 

 are common. In these the margin becomes more or less rounded and 

 the striae more numerous and irregular. 



Bolivina Barrandii sp. n., plate IV. fig. 7. 



Test elongate, lanceolate, compressed ; peripheral margin acute 

 and serrated ; chambers slightly inflated, inferior margin acute and 

 projecting ; sutures deeply sunk and smooth ; surface of chambers 

 ornamented with broken irregular costae. Aperture a long fusiform 

 slit. Length ' 45 mm. 



This species is closely allied to B. lobata Brady, and differs 

 principally in being more compressed and in having the peripheral 

 margin acute. In these respects also it differs from the B. campanu- 



