rOEAMINIFEEA OF THE KEEIMBA AECHIPELAGO. 723 



5 Stations. 



Very much more sparingly distributed than the closely allied form Rotalia calcar, 

 but attaining its optimum development, both as regards size and numbers, at the same 

 Stns. {2h and 11) as that species. At the remaining Stns, the specimens are few in 

 number and poorly developed. At Stn. 2 b the form has a tendency to lose the 

 marginal processes. At Stn, 11 two very well-marked varieties occur, (i.) practically 

 biconvex, (ii.) very compressed and with an evolute rotaline spire. 



429. Calcarina hispida Brady. 



Calcariiia hispida Brarly, 1876, LC. p. 406. 



„ calcar, var. hispida Carter, 1880, etc., SGM. 1880, p. 453. 



hispida Brady, 1884, FC. p. 713, pi. cviii. figs. 8, 9. 

 „ Lister, 1895, LHF. p. 437, pi. viii. figs. 34-37. 

 „ Chapmau, 1899, FFA. p. 15, pi. i. fig. 10. 

 „ Chapmau, 1900, FLF. p. l'96. 



1 Station. 



One rather coarsely hispid specimen from Stn. 11. The same remarks apply to the 

 occurrence of this species as to C. spengleri, the two species in our experience being' 

 usually associated. 



Subfamily T I N o p R I N ^. 



Gyfsina Carter. 



Preliminary Note. — In dealing with material such as this, the difficulty of correlating 

 a large and divergent series of specimens of what is one of the commonest and most 

 widely distributed genera occurring in the dredgings with the data afforded by the 

 diagnoses of previous authors is almost insuperable. The genus Gypsina has hitherto 

 included those forms in which the rotaline commencement is inconspicuous, if not 

 absent, and the later chambers are acervuline and without definite plan ; but in the 

 Kerimba material, while such specimens form perhaps the bulk of the material, there 

 are countless individuals which present a regularity of growth and structure not 

 compatible with such a simple type of structure. On the other hand, they cannot be 

 referred to Planorbulina because, although resembling the generic type in the earlier 

 portions of the shell, they pass, on full development, into a truly acervuline or 

 Gypsina-mode of growth. The numerous species and varieties which have been 

 separated by various authors, notably by Chapman, are of great value from the 

 taxonomic point of view, but in our opinion have little significance beyond indicating 

 the habitat and methods of life of the individual specimens. Whether it be free or 

 attached in its plan of growth must largely decide the mode of development of the 

 chambers in the adult shell: if attached, the nature of its host and its surroundings 

 will influence the shape and form of the resultant organism. Thus a specimen 



