~ 
54 BULLETIN OF THE 
Carbonate of Calcium, 47.87 per cent, consists of coccoliths, rhabdoliths, and 
the following Foraminifera : — 
Globigerina conglobata Candeina nitida 
G. bulloides Pullenia obliquiloculata 
G. bulloides, vay. triloba Pulvinulina menardit 
G. sacculifera P. menardii, var. tumida 
G. equilateralis P. canariensis 
G. rubra P. elegans 
G. dubia Truncatulina lobatula 
G. (Orbulina) universa Nonionina umbilicatula 
Residue, 52.13 per eent, reddish brown, consists of Minerals [20.00], m. di. 
0.05 mm., quartz, mica, felspar, hornblende, magnetite, palagonite, glauconite. 
Siliceous organisms [5.00|, Sponge spicules, glauconitie or other casts. Fine 
washings { 27.13], amorphous clayey matter, with fine mineral particles aud frag- 
ments of siliceous spicules. 
Specimen 4, Line P.— Lat. 26° 40’ N. Long. 96° 01’ W. 29 January, 1877. 
Depth, 489 fathoms. A brown mud, coherent, plastic. This deposit resembles 
very much a fine river clay, mixed with a very few pelagic Foraminifera; it would 
seem, judging from its position, to be derived from the fine detrital matter carried 
down by the rivers. 
Carbonate of Calcium, 2.76 per cent, consists of one or two coccoliths along 
with the following Foraminifera : — 
Biloculina ringens } 
Globigerina bulloides Ammodiscus charoides 
G. dubia Bolivina enariensis | 
G. rubra Bulimina rostrata 
G conglobata Pelagic B. oculata Bottom- 
Pullenia obliquiloculata | species. Nodosaria raphanus living 
Pulvinulina menardii Uvigerina asperula species. 
P. menardii, var. tumida U. asperula, var. auberiana 
P. micheliniana Spheroidina bulloides 
Truncatulina lobatula 
Pulvinulina elegans J 
Residue, 97.24 per cent, of a light slaty-brown color, consists of Minerals 
[25.00], m. di. 0.01 mm., quartz, magnetite, mica, felspars, augite, hornblende, 
and several small red particles. Siliceous organisms [1.00], siliceous spicules and 
fragments of Radiolarians. Fine washings [71.24], amorphous clayey matter. 
Specimen 21, Line FE E.— Lat. 20° 59’ N. Long. 96° 39’ W. 25 May, 1877. 
Depth, 511 fathoms. Volcanic mud, very coherent, clayey. 
Carbonate of Calcium, 15.14 per cent, consists of Echinoderm fragments, fish 
teeth, and Foraminifera as follows : — 
