Mr. H. J. Carter on the Structure of the Foraminifera. 833 



1856, preclude the necessity of my making any further observa- 

 tions on them beyond what will be found under the species 

 which I have had to describe. 



Classification. 



I would here merely observe that, as regards family distinc- 

 tion, it appears to me that Orbitoides dispansa, Conulites, Hetero- 

 stegina, and Cijcloclypeus should come together under one head, 

 and Orbitolites Mantelli, Cart., Orhitolina, Orbiculina, and Orbito- 

 lites, as defined by Dr. Carpenter, under another. Perhaps it 

 will be stated that the spiral form of the layer of chambers in 

 Conulites should place it with Nummulites, among D'Orbigny's 

 " Helicostegues," irrespective of its being in every other way 

 most closely allied to Orbitoides, which belongs to the " Cyclo- 

 stegues ;" and hence the doubtful value of the helical and cyclical 

 characters as natural distinctions, to which I have before alluded. 



Conclusion. 



Having thus made all the prefatory observations that I have 

 to offer at present on the different genera of Foraminifera, whose 

 species I shall now have more or less to describe particularly, 

 let us proceed to this part of the subject, remembering, as before 

 stated, that my object now is solely to correct, add to, and explain 

 what I have hitherto stated, and that, therefore, much will be 

 found in my paper in the 'Annals^ of 1853, to which I have 

 alluded, which is omitted here. It will be also necessary for the 

 most part, too, that the reader should provide himself with copies 

 of MM. d'xVrchiac and Haime's 'JNIonograph on the Nummu- 

 lites' and Dr. Carpenter's "Researches" in the 'Philosophical 

 Transactions,' respectively; for they are so necessary for the study 

 of the Foraminifera, that it is impossible to get on without fre- 

 quent reference to them. 



Among the new forms that I have had to introduce will be 

 found two varieties, viz. a and b of Assilina seu Nummulites 

 exponens, and one new species, viz. A. obesa, belonging to the 

 Explanatce; one new species belonging to the Punctulatce, viz. 

 N. broachensis ; two species to the Plicata vel Striata, viz. N, 

 makullaensis and N. kelateiisis ; one species to the Reticulata, 

 viz. N. masiracnsis, and an undetermined one from the coast 

 opposite; one new species of Alveolina, viz. A. meandrina; 

 and a new genus and species, viz. Conulites and C. Cookii re- 

 spectively ; one variety, if not a new species, of Orbitoides, viz. 

 O. asterifera ; and perhaps some new forms of Orbitolina, 



[To be continued.] 



