276 ME. H. B. BRADY ON SACCAMMINA CARTERI. 



reception, and the generic term Carteria* was provisionally as- 

 signed to it ; but I have since had the opportunity of seeing a 

 number of type slides of deep Atlantic Foraminifera sent by 

 Prof. Sars of Christiania to Dr. Carpenter, and amongst them 

 specimens of his Saccammina sphcerica, a species named in his 

 paper on the deep-sea fauna,! but, so far as I know, not yet de- 

 scribed. I am further indebted to Dr. Carpenter for a supply 

 of specimens of this form, which appears to be common at great 

 depths, and careful examination has convinced me of its very 

 close relationship to the Carboniferous fossil, although sufficient 

 difference appears to exist in minor particulars to justify specific 

 separation. The following morphological characters will serve 

 for diagnosis : — 



Genus. SACCAMMINA, Sars. 



Saccammina Carteri, n. sp. 



Test free, consisting either of a single chamber or of several 

 joined end to end in a single series ; chambers subsphe- 

 rical, fusiform or pyriform; texture arenaceous, com- 

 pact ; exterior surface nearly smooth, interior smooth or 

 slightly labyrinthic. Long diameter of the chambers 

 (average) about one-eighth of an inch. 

 Hab. Carboniferous Limestone, north of England. 



The distinction between the fossil species and Prof. Sars's 

 type is based, firstly, on the form of the chambers, which in the 

 latter are always subspherical and have but one aperture, whilst 

 in the former they are, as a rule, fusiform and have two aper- 

 tures ; secondly, on the fact that the recent species always 

 occurs in single segments, and there is no reason to believe that 

 it is ever polythalamous ; the test of S. Carteri, on the other 

 hand, is frequently many-chambered ; thirdly, the test of S. spJue- 

 rica is somewhat thinner, and nearly smooth both inside and out, 



" See Brit. Assoc. Reports, 1860 (Exeter Meeting), p. 381. I thereby wished to associate 

 the type with the name of my friend H. J. Carter, F.R.S., who has laboured so assiduously 

 and successfully amongst the Protozoa. As the matter stands, the specific term only is left 

 at my disposal. 



t See " Vidensk.-Selsk. Forhandlinger " forlSfiS, p. 248. 



