MQSEUM OF COMPARATIVE ZOOLOGY. 



41 



Polyzoa and coccoliths. All the tropical species of pelagic Forami- 

 nifera are abundant in these deposits, while they are relatively rare in 

 the deposits along the coast to the north of Cape Hatteras. 



The remains of siliceous organisms, such as Diatoms. Radiolarians, 

 Sponge spicules, and glauconitic casts of Foraminifera and other organ- 

 isms, make up usually 10 or 12 per cent of the deposit. 



The finer washings of these deposits are of a greenish color, which 

 seems to be chiefly due to the presence of some organic substance, the 

 nature of which has not yet been determined. A similar greenish mat- 

 ter was met with by the " Challenger " in deposits from the same depths 

 off the coasts of Africa, Australia, Japan, and China. 



Phosphate of lime and manganese concretions are present in all the 

 deposits, and one remarkable concretion of these substances is described 

 in detail from Station 317, in a depth of 333 fathoms, immediately 

 under the waters of the Gulf Stream. 



Many of these deposits might equally well be called Globigerina oozes. 



SfatwniU.—Jjat 32° 2i' N. Long. 78° W W. Depth, 142 fathoms. 

 Surf. temp. 81°. Bot. temp. 56|°. A greeuish gray saud, granular, very slightly 

 coherent. 



Carbonate of Calcium, 47-G4 per cent, consists of shells of Gasteropods, Lamel- 

 libranchs, Pteropods, and Ostracodes, fragments of Echiuoderins, coccoliths, and 

 the following pelagic and other Foraminifera : — 



Biloculina ringens, few. 



Globigerina bulloides, common. ' 



G. dubia, common. 



G. infiata, common. 



G. rubra, common. 



G. conglobata, few. 



G. sacculifera, few. 



G. {OrbuUnd) universa, few. 



Spk^roi'Jiiia dehiscens, few. 



Puhinulina menardii, common. 



P. menardii, var. tumida, com- 

 mon. 



P. michelinian/j, few. 



Ptillenia obliquiloculata, com- 

 mon. 



Planispirina calata, few. 

 Miliolina agglutinans, rare. 

 M. seminulum, rare. 

 M. venusta, conmion. 

 Vernevilina triquetra ? rare. 

 Texfularia conica, few. 

 Bulimina marginata, few. 

 Pela"'ic Nodosaria communis, rare. 



Bottom- 



species 



Cristellaria cultrata, common. V livin 



C. rotulata, rare. 



C. obtusata, rare. 



C. calcar, rare. 



C. sp. few. 



TJvigerina pygm/pa, few. 



TruncatuUna lobatula, few. 



Puhinulina elegans, rare. 



Rot alia sp. 



Nonionina umbilicatula, rare. 



species. 



