ILLUSTRATIONS (Continued) 



14 Cross rippling in sorted calcareous sand on a topographic 



high, Rift Mountains, Indian Ocean. . . 37 



15 Sediment slumping in calcareous clay on slope of inter- 



mountain valley, Rift Mountains, Indian Ocean. . .3 7 



16 Manganese -encrusted symmetrical ripple marks in cal- 



careous sand on southwest slope of Eniwetok Atoll. . . 3 9 



17 Free, spherical manganese nodules, 3.48 cm diameter, 



resting on Globlgerina ooze. South central Pacific 

 Ocean, northwest of Tahiti. . . 42 



18 Partially buried manganese nodules in clay sediment, 



Pacific Ocean south of New Zealand. . .42 



19 Manganese-impregnated pumice slabs resting on brown 



clay sediment; some clay capping is visible. East 

 North Pacific. . . 4 2 



20 Scattered manganese nodules resting on red clay sediment, 



East Indian Ocean. Rough surface of clay indicates 

 churning by benthonic organisms . . .42 



21 A high concentration of evenly spaced spherical manganese 



nodules, 3.48 cm diameter, resting on a Globigerina 

 ooze. Animal churning has caused the partial covering 

 of some nodules. South central Pacific Ocean, north- 

 west of Tahiti. . . 43 



22 Coral growing on encrusted volcanic boulders, inshore 



slope on east side of Mauritius Island, Indian Ocean. . . 4 5 



23 Holothurian (sea cucumber) and small ophiuroids (brittle 



stars) on surface of brown silty clay in San Diego 

 Trough. . . 4 5 



24 Numerous worms protruding from churned silty clay on 



east slope of Guaymas Basin, Gulf of California. . .4 5 



25 Ophiuroids (brittle stars), holothurians (spiny sea 



cucumbers), on churned surface of brown silty clay 

 in San Diego Trough. . . 45 



26 Sea pens growing on well churned clay in north Guaymas 



Basin, Gulf of California. . . 4 6 



27 Large sea urchin on rippled gray sand, marine slope of 



Saint Paul Island, Indian Ocean. . . 4 6 



28 Large ophiuroid (brittle star) and a number of small, spiny 



holothurians (sea cucumbers) on silty clay in protected 

 Flores Sea basin north of Soembawa Island, Indonesia. . .46 



