27 



Foraminiferce. PLATE 10. 



Lagena-form (Monostegia). Fro. i. 



Triloculina. Many varieties of this curious and simple form were 2000 fathoms 

 found in this sounding. Some of the Lagenidse were replete with L ^ g 33 21' 

 novelty and interest. w - 



A front and back view of this form is here given (SpiroloculinaC?) or 

 Triloculina, Miliolina), although differing in some points. It was 

 porcelainous, of a beautiful opaque white ; when broken under the 

 lens (with difficulty) the orifice was full of minute granules, and the 

 chambers, or segments, were found irregular ; there were no appear- 

 ances of pitted indentations on the surface. Back view, A : An 

 enlarged drawing of the orifice is given here oblong ; tooth simple ; 

 texture porcelainous ; opaque and glossy. 



Polymorphina. In this genus the chambers are composed of a FIG. 2 - 

 double series, glassy and transparent, interlaid one with the other, 

 having a dark band on one side of each cell ; this shows a curious 

 alternation of the chambers, and may be considered one of the 

 Lagenidse ; texture smooth and glossy ; foramina indistinct. 



Biloculina (Ringens). Oval ; septal orifice round ; tooth not seen ; FIG- 

 porcelainous ; opaque and glossy. 



Polymorphina (Acuminata). Oblong ; several elongated segments ; FIG. A. 

 sides differing. 



Entosolenia (Marginata). Elongated shell; smooth and transparent; FIG. l. 

 narrow margin ; none at lower extremity ; foramina perforations seen ; 

 eeptal orifice communicating with internal tube, passing into the 



D 2 



