276 PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



No. 74. Great Bahama Bank, 455 sea miles from Gun Cay. Material largely sand, much 

 worn, occasional moUusk shells, foraminifera few. 



Foraminifera: 



Orbiculina adunca, few. Articulina sagra, one. 



Peneroplis pertusus, few. Verneuilina affixa, few. 



Quinqueloculina reticulata, one. Calvulina angularis, one. 



Planispirinia exigua, few. 

 No. 75. Great Bahama Bank, 525 sea miles from Gun Cay. Material similar to No. 74. 

 Foraminifera few and poor. 



Foraminifera: 



Orbiculina adunca, few. Planispirinia exigua, few. 



Peneroplis pertusus, few. 



It is obvious that this represents a third distinct class of calcium car- 

 bonate deposit. 



GLOBIGERINA OOZE FROM THE TONGUE OF THE OCEAN. 



(Samples 84, depth 825 fathoms, and 85, depth 800 to 820 fathoms, collected by G. H. 

 Drew, see plate 95.) 



The mechanical analyses are given on page 269 (graphically illustrated 

 on plate 94); percentage of MgCOs on page 270. Particles of silt and 

 clay in 84, 65.7 per cent; in 85, 89.9 per cent. Silt in 84, 45.2 per cent; 

 if 85, 55.3 per cent. The large percentage of particles of silt size is 

 striking; it is larger than in any of the other specimens. Percentage of 

 MgCOs, in 84, 4.02; in 85, 2.89. No. 84 has only about 1.5 per cent less 

 MgCOs than the Cocoanut Point specimens; No. 85 has almost the same as the 

 fine-grained lagoonal deposits (see specimen No. 87). However, the sources 

 of the material in these two samples are different (at least in large part) from 

 that composing No. 87. The following are Dr. Cushman's lists of the organ- 

 isms, to which Coccolithophoridae should be added. The material includes a 

 few sponge spicules, occasional alcyonoid spicules, numerous pteropods, some 

 gastropods, few pelecypods, ostracod valves, occasional echinoid spines and 

 fragments of plates, numerous foraminifera of Globigerina ooze species. 



No. 84. Tongue of the Ocean (Drew) 825 fathoms. 

 Foraminifera: 



Peneroplis pertusus, few. Pulvinulina canariensis, few. 



Globigerina bulloides, frequent. Articulina sagra, few. 



Globigerina aequilateralis, frequent. Pullenia obliqueloculata, frequent. 



Globigerina dubia, abundant. Bulimina buchian, few. 



Globigerina rubra, frequent. Cristellaria variabilis, few. 



Pulvinulina menardii, frequent. Truncatulina reticulata, few. 



Pulvinulina truncatulinoides, abun- Biloculina murrhyna, few. 

 dant. 



No. 85. Tongue of the Ocean (Drew) 800 to 820 fathoms. 

 Foraminifera: 



Pulvinulina truncatulinoides, frequent. Pullenia obliqueloculata, frequent. 



Pulvinulina menardii, few. Pullenia sphaeroides, few. 



Globigerina rubra, frequent. Orbulina universa, few. 



Globigerina dubia, frequent. Cymbalopora poeyi, few. 



Globigerina aequilateralis, frequent. Cassidulina subglobosa, few. 



Globigerina bulloides, frequent. Biloculina murrhyna, few. 



