POEAMINIFEEA OF THE KERIMBA AECHIPELAGO. 705 



thickening of the shell-substance. At Stn. 3 the individuals were much lower in the 

 spire than in Sidehottom's figure, but were otherwise typical. The species is 

 probably closely allied to I), tahernacularis. 



370. Discorbina acuminata Chapman. 



Discorbina acuminata Chapman, 1901, FFA. p. 385, pi. s.xxvi. fig. 3. 

 9 Stations. 



The propriety of separating this little form from 1). tahernacularis is in our opinion 

 very questionable. It does not present any characteristic (except the apical spine) 

 which is not to be found in D. tahernacularis; and in any considerable range of 

 specimens in that species, specimens with a more or less acuminate apex and a sunken 

 base are not uncommon. The striae radiating from the apex of the cone, which 

 Chapman gives as a specific feature, are merely a weak form of the costse typical 

 of B. tabernacularis. Specimens agreeing with Chapman's figure and description 

 Avere found at most of the Stations, but only in small numbers. 



Planokbulina d'Orbigny. 



377. Planorbulina mediterranensis d'Orbigny. 



PlanorbuLinamediterranensis d'Orbigny, 1826/rMC. p. 280, jil. xiv. figs. 4-6, ModMe no. 79. 

 „ farcta, var. mediterranensis Parker & Jones, 1865, NAAF. p. 383, pi. xvi. fig. 21. 



„ mediterranensis Parker, Joues, & Brady, 1859, etc., NF. 1871, p. 178, pi. xii. 



fig. 133. 

 „ Brady, 1884., FC. p. 656, pi. xcii. figs. 1-3. 



„ Fgger, 1893, FG. p. 380, pi. xiv. figs. 24-26. 



Chapman, 1900, FLF. p. 192. 



9 Stations. 



Generally, but not universally, distributed. We have referred under Gypsina to the 

 diflaculty of separating the two genera when existing under exceptionally favourable 

 circumstances. The specimens of P. mediterranensis are, as a rule, large and wild- 

 growing, but perfectly typical and well-grown examples were found at Stn. 10. At 

 Stn. 9 the specimens were all exceptionally large, but fairly typical; at Stn. 11 good 

 specimens were found, both free and attached. At Stns. 2 a and 4 the species is 

 chiefly represented by a number of specimens just emerging from the early rotaline 

 stage. 



378. Planorbulina acervalis Brady. 



Planorbulina acervaiis Brady, 1884, FC. p. 657, pi. xcii. fig, 4. 



Brady, Parker, & Jones, 1888, AB. p. 227, pi. xlvi. fig. 11 

 „ „ Flint", 1899, RFA. p. 328, pi. Ixxii. fig. 7. 



Sidebottom, J904, etc., RFD. 1909, p. 2, pi. i. fig. 4. 



5f2 



