358 Dr. E. von Daday on a 



says : — " The calcareous shell so formed of spirally arranged 

 chambers, that it externally resembles the shell of a Helix or 

 Turbo. The chambers visible only upon one, usually convex, 

 side of the shell, concealed on the otlier side, which is less 

 convex, plane, or concave " *. In this subfamily it seems to 

 approach the genus Botaiia, but still more the ge\iViS Pidvmu- 

 lina, with which it might easily be confounded ; but it is 

 distinguished by the fact that its shell, as above indicated, 

 contains no pores, while, according to Max Schultze and 

 Biitschli, these are always present in the above-mentioned 

 and, indeed, in almost all other representatives of the family 

 Globigerinte of Carpenter. From the character of Polyinor- 

 phina silicea given by j\lax Schultze, in which it is stated 

 that the shell is apparently always solid, without fine pores, 

 1 believe that, notwithstanding the different form of its shell, 

 Entzia is also allied to that sj)ecies, and, indeed, chiefiy 

 because the shells of both contain siliceous plates. 



If we further take into consideration that the shell of 

 Enfzia is not perforated by any fine pores, we cannot avoid 

 thinking that it may be related to the Imperforata. In this 

 group the genus Trochammina, cited in an appendix by 

 Biitschli, might be mentioned, as we are told of it : — " The 

 genus Trochanum'na, on the other hand, included a great 

 number of mono- and polythalamous forms, differing remark- 

 ably in their forms, and only held together by the minute 

 structure of their shell- walls. These are composed of tine 

 sand-grains, which are so intimately united that the outer 

 surface of the shell always appears smooth, nay, sometimes 

 as if polished " f. Notwithstanding this remarkable agree- 

 ment in the structure of their sliells between the two genera, 

 I must assert that Entzia is more distantly related to the 

 Imperforata than to the Perforata, and, indeed, mainly on 

 account of the structure of the septa of the chambers. In the 

 description of the septa it has been stated that they are formed 

 of two lamellae, one belonging to the older, the other to the 

 younger chamber, wliile the septum of the Imperforata is 

 formed by a simple lamella. Upon this point, indeed, I have 

 no personal knowledge, but I may be allowed to appeal to 

 Biitschli, who says: — " In most cases this septum is formed, 

 in the manner described, of a single shell-lamella, namely the 

 continuation of the wall of the older chamber, that portion of 

 the new chamber which rests against the old one, obtaining 

 no special new wall, but being merely completed by the wall 

 of the preceding chamber. This is the condition of things at 



* Loc. cit. p. 58. t ^oc. cit, p. 19G. 



