OF SOUNDINGS. H 



plain above, very convex and slightly umbilicate belove. Spire having three 

 or four turns composed of oblique cells, about nine of which compose the last 

 turn. Aperture elongated, somewhat lunate, commencing near the angle of the 

 outer cell, and extending to near the middle of the inner margin. Near to R. 

 Soldanii U'Orh. It occurs rather frequently in the soundings No. 25 F, 49 fa- 

 thoms, but also occurs in several of the deeper soundings. I have named it in 

 honor of the Prince of Microscopists. 



Rotalina cultrata 7 D'Orb, figs. 14, 15 and 16. Shell punctate, depressed, spire 

 composed of about five cells, each of which has a conspicuous raised border, 

 which on the outer margins form a carinate edge to the cell. Our species ap- 

 pear to differ from the R. cultrata of D'Orbigny in having the carina slightly 

 rounded, instead of presenting the acute cultrate edge represented in PI. 5, fig. 

 9, Foraminiferes des Antilles. 



It is quite a common form in the deep soundings. 



Rotalina semipunctata, Bail., figs. 17, 18, 19. Shell somewhat irregular, hav- 

 ing six cells visible in the upper surface, which are marked with numerous deep 

 perforations on their upper surface, but are smooth and imperforate below. 

 Aperture lunate, with a raised margin Occurs in the soundings marked G. No. 

 28, 89 fathoms. 



Genus Globigerina, D'Orb. Shell free, spiral, globose, always rugose, and 

 perforated with minute holes. Cells few in number, spheroidal, arranged spi- 

 rally. Aperture generally crescent shaped, situated at the umbilical angle near 

 the axis of the spiral. 



Globigerina rubra, D'Orb., (figs. 20, 21, 22) .? figs. 23, 24. Shell elevated, spire 

 composed of one turn and a half, or in the adult shell of five cells only. Cells 

 spherical, very distinct, three of which form the last turn of the spiral. Besides 

 the usual aperture, two others are sometimes visible in the last cell, and one on 

 the last but one. 



The last cells are yellow, or yellowish red; while near the summit of the spire 

 the red tint predominates. 



Vast numbers of one or more species of Globigerina occur in some of the 

 soundings referred to above, being particularly abundant in those marked F. 

 No. 25, 105 fathoms, and H, No. 1, 90 fathoms. They are common also in 

 those marked G, No. 31, 50 fathoms, and H, No. 67, 50 fathoms, while they are 

 few and small in F, No. 24, 49 fathoms. Some of them, by their red color and 

 other characters, are decidedly referable to G. rubra of D'Orbigny. Others 

 like figs. 20 to 22, which are white and have a more elongated aperture, may 

 belong to a different species. The abundance in which these species of Globi- 

 gerina occur in the deep soundings, G, No. 31 and H, No. 1, gives to these 

 green muds a most striking resemblance to the green tertiary marls perforated 

 by the Artesian wells at Charleston, S. C This similarity appears to indicate 

 that the Charleston beds were a deep sea deposite, perhaps made under the in- 

 fluence of an ancient Gulf stream. 



