JEKASSIC ASTRORHIZID.E AND LITUOLID.E. 2t 



to R. nodulosa, Brady, but the texture is sometimes like that of R. 

 scorpiurus, Montf. 



R. multilocularis appears to be characteristic of the Lower Malm 

 of the Canton Aargau, where several specimens were obtained from 

 a bed with numerous Cephalopoda.- 



Beophax helvetica, Hausl. Plate II. figs. 8-10. 



This species was described by me as Dentalina helvetica * from the 

 zone of Amm. transversarius. It has since been found in the younger 

 sponge-beds of the Swiss Malm f , but is nowhere common, and gene- 

 rally in small fragments. 



Beophax scorpitjrus, Montf. Plate II. fig. 7. 



The figure represents a unilocular Lituola, which is probably 

 identical with R. scorpiurus. The tests are generally of small 

 size, seldom exceeding 0*8 mm., flask-like, somewhat pyriform, or 

 long, cylindrical, often slightly constricted, or bent, of a coarsely 

 arenaceous nature, and not rare in the sponge- beds of the lower 

 Argovian etage. Small fragments of this or a nearly related spe- 

 cies are common, but difficult to distinguish before treatment with 

 acids. 



There occur in the same beds other coarsely sandy tests of doubt- 

 ful nature, which, owing to their bad state of preservation, often 

 with chemical changes, could not be determined. 



Placopsilena cenomana, d'Orb. Plate III. fig. 1. 



P. cenomana is one of the commonest arenaceous species of the 

 whole Jurassic formation. 



In certain banks of the Lower Malm it is almost impossible to find 

 shells of Brachiopoda without traces of Placopsilince and Hyper am- 

 mince. Typical specimens differ in no way from those of other 

 formations. 



Thitrammina. papillata, Brady. Plate III. figs. 2-6. 



The Jurassic Thurammince differ but little from the recent forms 

 described by Brady J. Some of the specimens still show the 

 peculiar yellowish colour. 



As the recent Th. papillata is very variable, we meet also in the 

 transversal^ ius-beds with a large number of varieties, passing from 

 small, almost smooth, Orbulina-like forms to the large (1 mm.) 

 papillated types. 



In a few instances polythalamous specimens similar to that men- 

 tioned in Brady's paper were observed. As Uhlig§ discovered the 

 same species in the zoue of Amm. transversarius in the neighbour- 

 hood of Brunn, Th. papillata must be a widely distributed species, 

 mounting up into the zone of Amm. bimammatus. 



* Hausler, I. c. p. 34, pi. ii. fig. 45. 



t Hausler, *' Die Astrorhiziden &c," Neues Jahrbuch f. Min. 188o, vol. i. 

 p. 59, pi. iii. fig. 11. 



t Brady, I. c. p. 2d, pi. v. figs. 4-8. 



§ Uhlig, "Ueber einige oberjurass. For. mit agglut. Seh.," Neues Jahrb. f. 

 Min. 1882, vol. i. p. 152. 



