NOTES ON REXrCULARIAN RIIIZOPODA. 49 



from the Lituolat, and a separate genus has been constituted 

 for them.^ 



The generic term Reophax was employed by De Montfort, 

 in 1808,^ for an irregular scorpioid, moniliform Lituola, v/ith. 

 rough exterior and simple undivided chambers. His figure 

 is copied from one of Soldani's/ and as it represents a good 

 typical example, there seems no reason why the name should 

 not be retained for the non-labyrinthic uniserial group. 



For the parasitic or adherent modifications, d'Orbigny's 

 generic appellation, Placopsilina^ is already to some extent 

 employed todesignate the common non-labyrinthic forms, and 

 Mr. Carter has described under the name Bdelloidina^ an 

 adherent arenaceous organism apparently of more complex 

 type, which occupies a similar position in the labyrinthic 

 series. A third adherent genus, also labyrinthic, namely. 

 Poly phi' agina, has been instituted by Von E-euss for a set of 

 thin-shelled^ erect, columnar, coral-like forms found in the 

 Cretaceous beds of Germany. This bears considerable 

 prima facie resemblance, both in contour and mode of growth, 

 to the genus Haliphysetna, Bowerbank, the Rhizopod 

 nature of which, first suggested by Mr. Carter, seems now 

 to be fairly established. If we accept von Reuss's view of 

 Polyphrayma as the labyrinthic columnar type of the Lituo- 

 lidea, Haliphysema would take the corresponding place 

 amongst the non-labyrinthic forms. But the question still 

 remains whether either genus belongs strictly to this parti- 

 cular group. 



The term Haplophragmium is in general use amongst con- 

 tinental rliizopodists for the nautiloid and crozier-shaped, 

 non-labyrinthic, rough arenaceous species ; indeed, it appears 

 to have been used abroad almost indiscriminately for the 

 Cretaceous Lituolce. Lastly, there are the straight or arcuate 

 uniserial forms with labyrinthic chambers. To these Prof, 

 von Reuss has given the generic name Haplostiche, but of 

 them we know little beyond what he has himself written in 

 his description of its Cretaceous representatives. 



^ Vide Cyclammina cancellata, p. 62. 



^ Reophax scorpiurus, de Montfort, 1808, ' Conchyliologie Systematique,' 

 vol. i, p. 330, 83e, genre. 



2 Soldani, ' Testaceographia,' vol. i, pt. 3, p 239, pi. 162, fig. k. 

 Nodosaria (Detila Una) scorjnuius, d'Orhigny, 1826, 'Ann. Sci. Nat.,' vol. 

 vii, p. 255, No. 40. 



* Placopsilina cenomana, d'Orbigny, 1850, 'Prodrome de Paleont.,' vol. 

 ii, p. 185, No. 758,' "Espece coiitournee en crosse adherente aux corps." 



* 'Annals and Mag. Nat. Hist.,' 1877, Ser. 4, vol. xix, p. 201, pi. 13, 

 figs. 1-8. 



VOL. XIX. NEW SER. D 



