46 BULLETIN OF THE 
an empty space between. When these spaces are filled by a further 
deposition of lime, the whole becomes very compact and massive. 
The centres of the Foraminifera are frequently filled with a gray or 
yellowish substance which does not, however, give the reactions of 
phosphate of lime. 
The mineral particles were very few in number, among them frag- 
ments of quartz and plagioclase being observed. This concretion was 
about two inches in diameter and had a rough areolar surface on which 
Serpulz and Polyzoa were growing. 
A similar and somewhat larger concretion from 200 fathoms (St. 
291) was also obtained off the Barbadoes, which was much more over- 
grown with organisms, and on its upper surface had a large cavity in 
which a hermit-crab had lived. (Polycheles Agassizii, see Bulletin VIII. 
No. 1.) 
Off the north coast of San Domingo, in 772 fathoms (No. VI.), there 
were obtained several small manganese Nodules and a few fragments of 
a Corallium coated with manganese, precisely similar to that dredged by 
the “Challenger” in 1,525 fathoms near the Cape Verdes (see Narrative 
of the Voyage, page 125). The interior of the nodules were of a light 
brownish color and were composed in all cases chiefly of a mass of pelagic 
Foraminifera. The largest of these nodules had a diameter of about 
two inches. Microscopic sections of the nodules and concretions were 
easily made and showed with great distinctness the structure of the 
mass, composed chiefly of pelagic Foraminifera cemented together as 
above stated. 
Station 103.— Old Bahama Channel. Depth, 438 fathoms. Surf. temp. 79°. 
Bot. temp. 493°. A Pteropod ooze or white coral mud, slightly coherent when 
dry, chalky. 
Carbonate of Calcium, 87.06 per cent, consists of Gasteropod, Lamellibranch, 
Ostracode, Pteropod and Heteropod shells, caleareous Alge, Echinoderm frag- 
ments, Polyzoa, Aleyonium spicules, coccoliths and rhabdoliths, and the following 
Foraminifera : — 
Globigerina dubia Cymbalopora bulloides 
G. rubra | Miliolina seminulum 
G. hirsuta WM. linneana 
G. equilateralis M. bicornis 
G. (Orbulina) universa } Pelagic M. agglutinans 
Pulvinulina menardii spe Biloculina cornuta 
Pulvinulina sp. 
Cassidulina crassa 
Textularia turris 
P. micheliniana 
P. menardii, var. tumida 
Pullenia obliquiloculata | 
