2 PROCEEDINGS OF THE NATIONAL MUSEUM vol 66 



111 the Tertiary of America there are at least four species and to 

 this genus should be referred Hantken's species. These are all de- 

 scribed below and figures are given of all of them. They seem to 

 mark the Uppermost Eocene in Alabama and elsewhere on our 

 Gulf Coastal Plain and the Mexican species from the Alazan are 

 closely related. Hantken's species is from the ClavuUnaSzdihoi beds 

 of Hungary. 



HANTKENINA KOCHI (Hantken) 



Plate 2, fig. 1. 



SideroUna kochi Hantken, A magy. kir. foldt. int. evkonyve, vol. 4, 1875 

 (1876), p. 68, pi. 36, fig. 1; Mittli. Jahrg. ung. geol. Anstalt, vol. 4, 1875 

 (1881), p. 79, pi. 16, fig. 1. 



Description. — Test planospiral, laterally compressed, adult coil 

 composed of five chambers, wall smooth, sutures slightly depressed, 

 distinct, each chamber in the adult with a rapidly tapering spine in 

 the last formed chambers nearer the apertural side, hollow, aperture 

 not shown. 



Diameter 0.5 mm. 



The type specimen as described from the ClavuUnaSzsihoi beds of 

 Porna, Hungary, was a unique, no other specimens being known. 



Hantken speaks of the aperture being formed by the tubelike pro- 

 jection, but this is evidently an error, as the hollow spines would give 

 this appearance. The aperture may have been filled and indistinct. 



HANTKENINA BREVISPINA, ne'.v species 



Plate 2, fig. 3 



Deso'ipfion. — Test somewhat compressed, planospiral, six cham- 

 ^bers in the adult coil, periphery not lobulate, wall distinctly per- 

 jforate, each chamber with a short hollow spine broad at the base, 

 ^chambers of the umbilical area slightly visible. 



-Diameter without spines 0.45 mm., with spines 0.65 mm. 



'Type specim.e7i.—C^t. No. 353079, U.S.N.M., from Mexico. Light 

 colored clay, lower 20 feet of exposure, Rio Pantepec, 2.2 kms. S. 

 20° W. from Buena Vista, T. W. Vaughan, Collector. 



This sjDecies has much shorter and stouter spines than the other 

 species of the genus. 



HANTKENINA LONGISPINA, new species 



Plate 2, fig. 4 



Description. — Test planospiral, compressed, chambers rapidly in- 

 creasing in size and height as added, five or six in the adult coil, 

 those of the early coils showing slightly at the umbilicus, each 

 (.chamber with a long stout spine, often somewhat longer than the 



