Knowledge. 



With which is incorporated Hardwicke's Science Gossip, and the Illustrated Scientific News. 



A Monthly Record of Science. 



Conducted by Wilfred Mark Webb, F.L,S., and E. S. Grew, M.A. 



XOVEMISER, I'JIO. 



NOTES ON BRITISH FORAMINIFERA. 



IV.—HAPLOPHRAGMICM AGGLUTIXAXS D'OKBIGXY, SP. 

 HAPLOPHRAGMIL M CAXARIEXSH DORBIGXY. SP. 



Bv EDWARD HEROX-ALLEN, E.L.S., F.R..M.S., and 



ARTHUR EARLAXD. 



H.v\'iX(; now described a species representative of 

 each of the principal groups of the Foraminifera, 

 viz., the Imperforate or Porcellanous (Massiliiia 

 secaiis d'Orb. sp.) 

 and the Perforate 

 or H\aline {Poly- 

 stoinella crispd 

 Linne sp.), uc now 

 propose to deal with 

 two species of a 

 genus representing 

 the .\renaceous 

 Foraminifera, i.e., 

 the group in which 

 the animal, instead 

 of secreting a shell 

 of carbonate of lime 

 derived from the 

 seawater, builds 

 itself a composite 

 house of adventiti- 

 ous fragments of 

 material obtained 

 from its environ- 

 ment, such frag- 

 ments being ce- 

 mented together in 

 a more or less orderh' arrangement 

 special cements secreted by the animal. 



Taken as a whole the Arenaceous Foraminifera 

 are inhabitants of more or less deep water, some 

 being known only as deep sea forms. They 

 are consequent!}- but little known to the student 



tioiii a p 



whose observations are confined to such material as 

 can be gathered between tide marks, and although a 

 few species, such as those now under consideration, 



can usually be 

 found in any ex- 

 tensive gathering 

 made on our coasts, 

 we should perhaps 

 have omitted them 

 from our sketches 

 of the commoner 

 British Foramini- 

 fera but for the 

 extraordinary in- 

 terest which the 

 Ljroup possesses 

 nwing to the mar- 

 \ellous ingenuity 

 which is sometimes 

 displayed b\' the 

 animals in the con- 

 struction of their 

 shells. 



The exact zoolo- 

 gical value of the 

 Arenaceous group is 

 somewhat difficult 

 bv means of to estimate, for although it would be very convenient 

 for purposes of classification to separate all the 

 P'oraminifera with agglutinated shells from those 

 secreting an external shell wall of carbonate of lime, 

 such a division would be entirely artificial. There 

 are some species proper to both the Porcellanous and 



Figure 



Haplopliragiiiiiiin af>gli(tiiutns. d'Orbigny, sp. Specimens from the Mixon 



Beacon. Selsey, Sussex, utilising garnet glanconite and coal' dust for the 



construction of the shells. X 65. 



421 



