﻿SACCAMMINA CARTERI. 



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dredged in 450 fathoms, at which depth it appeared to be abundant. Subsequently a 

 number of specimens were forwarded to Dr. Carpenter, who described the type in 

 general terms as having a " test of regular spherical form with a flask-shaped neck ; the 

 test composed of large sand-grains firmly cemented together so as to present a smooth 

 exterior, whilst their angles project into the interior of the cavity, which is filled in the 

 living state with sarcode." 1 



The Carboniferous form about to be described differs from the type thus 

 characterised in its moniliform mode of growth and the consequent distomous con- 

 dition of the chambers, but these may be regarded as mere morphological variations 

 of little weight as compared with similarity in general and minute structure. The fossil 

 species therefore has been placed in the same genus with the living deep-sea form, and the 

 generic characters have been defined afresh, so as to include the polythalamous 

 specimens. 



Saccammina Cakteri, Brady. PI. I, figs. 1 — 7 ; and PI. XII, fig. 6. 



Nodosaria fusulinaformis, (?) McCoy, 1849. Ann. and Mag. Nat. Hist., ser. ii, 



vol. iii, p. 131. 



— — (?) Id., 1854. Contrib. Brit. Paleeont., p. 100. 



Carteria, sp. Brady, 1869. Report Brit. Assoc., Exeter Meeting, p. 372. 

 Saccammina Carteri, Brady, 18/1. Ann. and Mag. Nat. Hist., ser. iv, vol. vii, 



p. 177, pi. xii. 



— — Id., 1871. Nat. Hist. Trans. Northumberland and Durham, 



vol. iv, p. 269, pi. xi. 



— — Utheridffe (jun.), 1873. Trans. Edin. Geol. Soc, vol. ii, 



p. 225. 



— — Id., 1873. Mem. Geol. Surv. Scotland, expl. sheet 23, p. 96. 



— — Young, 1873. Trans. Geol. Soc. Glasgow, vol. iv, part iii, 



p. 259. 



— — Lebour, 1875. Trans. N. of Eng. Inst. Min. Engineers, 



vol. xxiv, p. 141, pi. xxxiii, fig. 2. 



— — Bennie, 1876. Geol. Mag., n. s., Decade II, vol. iii, p. 47- 



Characters. — Test free, consisting of several chambers joined end to end in single 

 series ; chambers subspherical, fusiform or pyriform ; texture arenaceous, compact ; 

 exterior surface nearly smooth ; interior sometimes smooth but usually rugose, often more 

 or less labyrinthic. Long diameter of the chambers about ^th inch (3*2 mm.) in 

 average specimens. 



1 ' Descriptive Catalogue of Objects from Deep-Sea Dredgings exhibited at the Soiree of the Boyal 

 Microscopical Society, King's College, April 20th, 1870,' by Dr. Carpenter, F.R.S., p. 5, No. 4. 



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