360 Dr. E. von Daday on a 



the Globigerinfe, as in characterizing this group Biitschli 

 expressly remarks, " Mono- or polythalamous, chitinous^ cal- 

 careous (hyaline), or sandy " *. 



After all that has been said we may range Entzia tetra- 

 stomella with the sandy-shelled forms of the group Globige- 

 rinte, and especially with the " arenaceous Rotalinte " and the 

 genus Trochainmina^ of which Biitschli remarks : — " This 

 embraces polythalamous forms, rotaloid, trochoid, or nautiloid 

 in their winding, which in their forui in part so nearly 

 ap])roach the calcareous Rotaliufe &c. that we are much 

 inclined to place them in the vicinity of the latter "f. 



From these comparative remarks I think I shall not be 

 mistaken in asserting that : — 



1. Entzia tetrastomella^ the only continental Polythalaraian 

 at present known, resembles, in the form of its shell, the 

 Rotalinai of the group Globigerinai, Carp. 



2. In the structure of its shell it ao-rees with the sienus 

 Trochammina among the imperforate Polythalamia. 



3. The structure of its septa agrees with that of the perfo- 

 rate Polythalamia. 



4. The structure of the orifices of its septa is that of the 

 Lagcnidffi, Carp. 



5. The chemical composition of its shell resembles that of 

 the Diffiufjice and also that of Polymorphina sillcea and the 

 genus Trochammina^ and reminds us of the group of the 

 Globigerinaj. 



Finally I regard it as probable that Entzia tetrastomella^ 

 with some forms of the genus Trochammina^ represents a 

 group Avhich unites the imperforate with the perforate Poly- 

 thalamia ; at the same time it forms a genus which, by the 

 intermedium of the Rotalinaj and the genus Trochammina, 

 closely unites the group of the Lagenidae with that of the 

 Globigerinas. 



In conclusion I will devote a few words to those Protozoa 

 associated with which Entzia occurs in the salt-pools. I 

 noticed the following species : — 



1. Amceha Umax, Duj. 



2. Fleurophrys Julix, Entz, 



3. Dactiilosphcera polypodia, M. Seh. 



4. Ctiphodcria ampulla, Ehr. 



5. Orbulinella smaragdea, Entz. 



6. Euglena viridis, Ehr. 



• Loc. cit. p. 200. t Loc. cit. p. 196. 



