PLATE XV. 
This plato represents the appearance of various deposits in which siliceous organisms play an important role. 
Fig. 1. Sections of Diatom Ooze from Station 157 ; 1950 fathoms, Southern Indian Ocean (fig. la magnified 
50 diameters, fig 16 300 diameters). Although the deposit is principally made up of the frustules 
of Diatoms, there are numerous shells of Glohiyenna in the deposit. 
1. Rarliolnrian. 
2. Diatoms. 
3. Section of Olohigerina duterlrei. 
4. Kadiolarian. 
5. Globigtrina hulloidr.s. 
6. Kudiohirian. 
7. Section of Qlobigerina bulloides. 
8. Part section of Glcbigerina bulloules- 
9. Globigtrina {?). 
10. Kadiolarian. 
11. Diatom. 
12 . 
13. 
14. 
16. 
16. 
17. 
18. 
19. 
(Fragilaria). 
( Coscinodiscus). 
( Thalassiothrix). 
(Navicula). 
{Actinoeydm). 
(Coscinodiscus fragment). 
Fig. 2. Sections of Globigerina Ooze from Station 271 ; 2425 fathoms. Central Pacific (fig. 2a magnified 50 
diameters, fig. 26 200 diameters). In this deposit, while tropical species of pelagic Foraminifera 
predominate, tlie shells and skeletons of Radiolaria make up a very large part of the deposit. 
1. Part section of Pulvinulina menardii. 
2. Cyrtoidean. 
3. Portion of Foraminiferous shell (?). 
4. Double-shelled Spheeroidean. 
6. Globige/ina bulloides (young). 
6. Double-shelled Sphseroidean. 
7. Lychnocanium siginopodimn. 
8. Section of Discoidean ; unnumbered figure to 
the right, Slylodictya arachnia. 
9. Globigerina bulloides (young). 
^ 0 . >i )> 
1 1. Part section of Globigerina conglobata. 
12. Panartus IctreUhalamus. 
13. Median section of Pullenia obliquiloculata. 
14. Co:codiscidean. 
15. Section of double-shelled Cubosphseridcan (?). 
16. Section of Phacodiscidean. 
17. Part section of Globigerina conglobata. 
18. Section of Spongodiscidean. 
19. Stylosphaeridean. 
20. Section of double-shelled Sphseroidean or 
Prunoidean. 
21. Part section of Pulvinulina menardii. 
22. Spongiose Prunoidean. 
23. LyehnospJieera regina. 
24. Section of fragment of shell of Pullenia 
obliquiloculata. 
25. Cyrtoidean. 
26. Diatom ( Coscinodiscus ?). 
27. Kadiolarian. 
28. Ldthomitra eruca (?). 
29. Cyrtoidean. 
30. Carposphecra melitomma. 
31. Portion of Porodiscidean. 
Fig. 3. Section of Kadiolarian Ooze from Station 225 ; 4475 fathoms. Western Pacific, where the deposit is 
principally made up of the remains of Radiolaria and other siliceous organisms. 
1 . 
2 . 
3. 
4. 
6 . 
6 . 
7. 
8 . 
9. 
10 . 
11 . 
12 . 
13. 
14. 
15. 
16. 
17. 
Sponge spicule (Geodia ?). 
Portion of Kadiolariau skeleton. 
Sponge spicules. 
Rhcj^odictyum sp. (?). 
Stichocyrtidean (Diclyomilra caltanisettx 1 ), 
(?)• 
Portion of section of Porodiscidean. 
Portion of shell of a Porodiscidean or Spongodis- 
cidean. 
Tricyrtidean. 
Pipetlaria fusaria. 
Stichocyrtidean. 
Anthocyrtium, n. sp. (same form as in fig. 4, 
No. 20). 
Lychnocanium sigmopodium. 
Sponge spicule. 
S]>ongo spicule (?). 
Carponjiluera vxilUveri (small specimen). 
Prunoidean. 
18. Fragment of Stylosphajridean (?). 
19. Young stage or defective specimen of Carpo- 
canium petalospyris. 
20. Carposphaera waltheri. 
21. Sponge spicules. 
22. Dictyomitra caltanisettm. 
23. Spyroidean. 
24. Lruppula nucula (?). 
25. Archicapsa quadriforis (?). 
26. Tricyrtidean (same as No. 9). 
27. Kadiolarian. 
28. S[ionge spicule. 
29. Cyrtoidean. 
30. Sethodiscus phacoides. 
31. Tricyrtidean (same as Nos. 9 and 26). 
32. Spongodiscus Jlorealis. 
33. Ent7j7npanium musicantum. 
34. Cyrtoidean. 
I'ig. 4. Section of Kadiolarian Ooze from Station 268 ; 2900 fathom.s. Central Pacific, where the deposit i.s 
principally made up of the shells and skeletons of Radiolaria. 
1. Fragment of skeleton of Phseodarian. 
2. (?) 
3. Cenotphecra compacla. 
4. Akanihasphacra davaia (f). 
5. .Section of Cyrtoidean. 
6. Slylodictya kdioKjtira. 
7. Portion of Crnonphwra sp. (t). 
8. Siphonmphsera socialia. 
9. .S|>yroidcan. 
10. Cenospbaern mellijica. 
11. Cyrtoidean. 
12. Didijomitra caltanisettae. 
13. Section of Phacodiscidean or Prunoidean (t). 
14. Siphonosj)htera patinaria. 
15. Stylosphicridean (?). 
16. Fragment of liadiolarian skeleton. 
1 7 . Dorcadospyris antil ope . 
18. Section of Cyrtoidean. 
19. Thcrosphmra zUtelii. 
20. Anthoajrtium, n. sp. (same as No. 12 in 
fig. 3). 
21 . Section of shell of Cyrtoidean. 
