648 MESSES. E. HEEON-ALLEN AND A. EAELAND ON THE 



amount of variation, especially as regards tlieir punctation, some being very coarsely 

 perforate. Many specimens passing, on the one hand, into B. flicata and, on the 

 other, into B. punctata were observed. 



226. Bolivina plicata d'Orbigny. 



Bo/ivma plicata d'Orbigny, 1839, FAM. p. 6.2, pi. viii. figs. 4-7. 

 Mobius, i880, FM. p. 95, pi. ix. figs. 13, 13. 

 „ Halkyard, 1889, RFJ. p. 65, pi. i. fig. 13. 

 „ „ Gues, 1894, ASF. p. 51, pi. ix. figs. 487, 488. 



Heron-Allen & Earlaud, 191.3, CI. p. 68. 



1 Station. 



One specimen only, but quite typical. 



227. Bolivina inliata Heron- Allen & Earland. 



Bolivina inflata Heron-Allen & Earland, 1913, CI. p. 68, pi. iv. figs. 16-19. 

 <S Stations. 



Occurs in small numbers at the Stns., but only at a few is it quite typical. At 

 Stn. IX the specimens are somewhat angular at the periphery, and show signs of 

 approaching Textularia rhomboidalis Millett. 



228. Bolivina simpsoni, sp. n. (PL XLIX. figs. 18-35.) 



14 Stations. 



This handsome and very distinctive form is quite one of the features of the Kerimba 

 dredgings at every Stn., except No. 7. 



The test commences with a primordial chamber often bearing a terminal spine of 

 considerable length, followed by four to seven or eight pairs of chambers. The earlier 

 pairs are frequently ornamented with stout marginal spines, which are themselves 

 extensions of the limbate sutural walls. The marginal spines are practically parallel 

 arid may extend to a length approaching the wnole diameter of the test at the point 

 of their emergence. The shell- wall is thick and covered all over with rough aculeate 

 growths, which, in the later chambers, may become fused and develop into raised lines 

 of shell-substance (" verriculations") either straight or curved. The sutural lines are 

 strongly limbate, especially in the early chambers where they stand up as thick walls 

 of clear shell-substance, the surface of the chambers being deeply sunk between them 

 and very inconspicuous. In the later chambers the limbation of the sutures, although 

 present, is much less marked, owing to the fact that the chambers as they become 

 broader become slightly inflated. Down the median line of the shell there is a more 

 or less clear space due to the interruption of the limbate sutures. The ajaerture is a 

 deep broad bolivine slit, the marginal edges are sometimes thickened and glassy, but 

 the verriculate markings often extend over the curve of the edge, into the aperture. 



