the shore-sand at boonor, sussex. 231 



Explanation of Plates 11 — 14. 



Plate 11. 



Fig. 1. Nubecularia lucifuya, Def ranee. Upper surface of 

 attached specimen. 



2. Nubecularia lucifuga, Defrance. Under surface of 

 detached specimen, in which the chambers show a 

 regularly spiral arrangement. The internal septa 

 are visible through the shell substance. 



3. Nubecularia lucifuga, Defrance. Very young specimen, 

 showing the unseptate spiral shell surrounding 

 the primordial chamber. 



4. Massilina secans, d'Orbigny sp., var. dmticulata, Costa. 



)• 



?) 



-}> 



„ 5. ,, ,, „ ,, var. nov. tenuistriato . 



->> 



-?» 



6. Thurammina papillata, Brady. Free specimen of 

 irregular growth. 



7. Thurammina papillata, Brady. Underview of adherent 



specimen which has become detached, showing at a 

 the delicate chitinous membrane (broken) which 

 lines the test and forms a continuous wall between 

 the sarcode body and the object to which the test is 

 attached. 



Plate 12. 



Fig. 1. Spiroplecta fusca, sp. nov. Lateral view. 



,,2. ,, „ ,, Peripheral view. 



„ 3. „ „ „ Oral view. 



,, 4. Discorbina parisiensis, d'Orbigny, sp. Superior aspect. 



.,, 5. Discorbina. Inferior aspect of a specimen after plasto- 

 gamic union. The greater part of the basal wall has 

 been absorbed ; the internal septa, which are indicated 

 by the thick septal lines on the inner surface of the 

 test, have also been absorbed. 



6. Discorbina parisiensis, d'Orbigny, sp. Inferior aspect. 



7. }J ,, „ „ Plastogamic union 

 of three specimens. 



8. Discorbina obtusa, d'Orbigny, sp. Superior aspect. 



9. Discorbina vesical aris, Lamarck, sp. Superior aspect. 

 10. „ „ „ ,, Inferior aspect. 



■)■> 

 5) 



55 

 -35 



