68 FORAMINIFERA 



chitinous layer and an outer layer of sand grains and other 

 foraminiferal tests; apertures at the ends of the tube, bordered 

 by the thickened chitinous lining of the interior. 



Recent, off New Zealand, 110 fathoms. 



The wall of this species is like that of some species of 

 Rhizammina, but the tubular chamber is very short. 



The foraminifera belonging to this family are of very simple 

 structure. The elongate cylindrical test with a chitinous inner 

 layer and the apertures at the ends may be directly derived from 

 such a simple form as Shepheardella in the Allogromiidae. The 

 fossil record goes back to the Jurassic, but they are probably 

 older and are to be looked for in the Palaeozoic 



EXPLANATION OF PLATE 3 



Rhizamminidae, Saccamminidae 



Fig. 



1-3. Marsipella elongata Norman. Fig-. 1, Exterior (After type figure). 

 X 65. Fig-s. 2, 3, (After H. B. Brady). X 40. Fig-. 2, Portion 

 of surface of middle of test showing structure. Fig'. 3, Portion 

 of surface at end showing massed fragments of sponge spicules. 

 4-6. Bathysiphon filiformis M. Sars. (After H. B. Brady). Fig. 4, 

 Transverse section of test by transmitted light showing base of 

 sponge spicules covered with light colored amorphous material. 

 X 40. Fig. 5, Longitudinal section by transmitted light. X 135. 

 Fig. 6, Exterior. X 2. 

 7-10. Rhizammina algaeforynis H. B. Brady. (After type figures). Fig. 

 7, Specimen from sandy bottom. X 5. Fig. 8, Fragment showing 

 structure of wall. X 28. Fig. 9, Specimen from Glohigerina^ 

 ooze. X 5. Fig. 10, Decalcified specimen from Glohigerina- 

 ooze. X 28. 



11, 12. Brachysiphon corbuliformis Chapman. X 20. (After type fig- 

 ures). Fig. 11 a, fi-om above; b, from side. Fig. 12, From below. 



13, 14. Psammosphaera fiisca Schultze. (After H. B. Brady). Fig. 13, 

 Exterior. X 15. Fig. 14, Test laid open to show intei'ior and 

 structure of wall, x 28. 

 ■ 15, 16. Psammosphaera parva Flint. (After H. B. Brady). Fig. 15, Ex- 

 terior. X 28. Fig. 16, Test laid open to show interior and 

 structure of wall with sponge spicule around which the test is 

 built. X 35. 



17, 18. Sorosphaera confiisa H. B. Brady. X 10. (After H. B. Brady). 

 Fig. 17, Exterior of type specimen. Fig. 18, Showing structure 

 of interior. 



