260 Transactions of the Society. 



development by gemmation has proceeded in the ordinary way 

 through a succession of segments, but in the last two the direction 

 has been reversed, their septal orifices being situated on the oppo- 

 site margin to that which they occupy in all the preceding ones, 

 the curvature of the shell and direction of the septal lines being 

 likewise reversed." But the figure shows that in addition to the 

 change of direction there is a change of character, the compact 

 initial portion of the test being succeeded by two inflated chambers 

 which may be assigned either to Dentalina or Marginulina. The 

 Marginulina obstipa of Terquem differs from the other figured 

 examples in having the aperture situated in a phialine neck. The 

 form figured by Brady is still more doubtful, but there seems to 

 be no particular reason why the terminal chamber should be 

 assigned to Polymorphina rather than to Dentalina. 



Amphicoryne Bradyi A. Silvestri sp., plate V. fig. 3. 



" Intermediate specimen with Vaginuline commencement and 

 final Nodosarian chamber," Brady, 1884, Chall. Piept., explanation 

 of plate, pi. lxvi. fig. 20. Nodosariopsis bradii A. Silvestri, 1902, 

 Atti Accad. Pontif. Nuovi Lincei, anno lv. p. 53. 



The strong resemblance between the example here figured and 

 the • Challenger ' specimen, renders it highly improbable that both 

 should be monstrosities. Brady's figure just indicates the spines 

 which are so conspicuous a feature in the specimen from the Malay 

 Archipelago. 



It is exceedingly rare and has been found only at Station 25 in 

 Area 2. 



Amphicoryne falx Parker and Jones sp., plate V. fig. 4. 



Marginulina falx Parker and Jones, 1860, Quart. Journ. Geol. 

 Soc, vol. xvi. p. 302, No. 28. Amphicoryne falx (P. and J.) 

 Brady, 1884, Chall. Kept., p. 556, pi. lxv. fig. 7-9 ; ? pi. cxiii. fig. 13. 

 Nodosaria scalaris var. caudata A. Silvestri, 1893, Mem. Pontif. 

 Accad. Nuovi Lincei, vol. ix. p. 204, pi. iv. fig. 2. Amphicoryne. falx 

 (P. and J.) A. Silvestri, 1899, Mem. Pontif. Accad. Nuovi Lincei, vol. 

 xv. p. 221, pi. iii. fig. 4. Nodosariopsis falx (J. and P.) A. Silvestri, 

 1902, Atti Accad. Pontif. Nuovi Lincei, anno lv. p. 49, figs. 1-3, 9. 



This form is a little less rare than the others, but it occurs 

 only at Station 30 in Area 2. The Malay Archipelago examples 

 are delicately striated, whilst those from other localities have the 

 Nodosarian portion strongly costate. In some of the Mediterranean 

 examples and in the specimen from the Italian pliocene figured by 

 Silvestri the Cristellarian portion is smooth, whilst the succeeding 

 chambers are costate. Of this character also is the example 



