No. L] 



J. W. DAWSON — PAL^ONTOLOGICAL NOTES. 



II. Saccammina ? (Calcisph^ra) Eriana, 

 (An Erian Khizopod of uncertain affinities.) 



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Fig. 3. — Saccammina Eriana. (a) natural size ; (b) magnified, showing 

 sculpture; (c) magnified, shcuing aperture; (d) section 

 magnified, showing aperture ; (e) section of portion of wall 



more magnified, showing structure. 



Several years ago, specimens were sent to me by my friend 

 Dr. Newberry, of New York, of a curious organism from the 

 Devonian (Corniferous) limestone of Kelly's Island, near San- 

 dusky, Ohio. They are minute globular bodies, one millimetre 

 in diameter, and occur in great numbers in light gray limestone 

 containing Strojnatoj^ora, crinoidal joints and corals, as well as 

 multitudes of minute oro-anic fragments. The exterior surface 

 of the specimens is dull or granular in aspect, and either smooth 

 or marked with slight spiral ridges, giving an appearance which 

 at first sight suggests a resemblance to the spore-cases of Chara. 

 On microscopic examination, they are found to be hollow spheres 

 filled with calc'ite introduced by infiltration, having one small 

 aperture ; and the test or wall of the sphere presents a granular 

 appearance as if composed of fine calcareous grains. Under- 

 standing that Dr. Newberry desired a note for publication in his 

 Reports on the Survey of Ohio, I prepared and sent to him the 

 following description, which, however, I have not yet seen in 

 print : — 



'' Saccammina Eriana. — Test globular, about one millimetre 

 in diameter, with one aperture. Wall composed of minute calca- 

 reous grains, smooth interiorly, on the outside smooth, irregular 

 or fluted longitudinally. Corniferous limestone near Sandusky. 

 Collection of Dr. Newberry. 



" This little organism occurs in great numbers in whitish gran- 

 ular limestone, associated with fragments of crinoids and corals. 

 Its test appears to be composed of very minute calcareous grains, 



