700 ME. W. M. HOLMES ON, RADIOLAEIA FROM THE [XoV. I9OO, 



Genus Staubalastbum, Hseckel. 



Porodiscidae having four simple undivided chambered arms, without 

 a patagium ; quadrangular, forming a regular cross, with four equal 

 arms placed at right angles, each terminated by a spine. 



Staubalastbum venustum, sp. nov. (PL XXXVIII, fig. 1.) 

 Arms slightly increasing towards the distal end, then tapering to 



a prismatic spine. Pores obliterated. Length of arms, including 



spines = '22 mm. Breadth at base = *04 mm. Greatest breadth 



= •055 mm. 

 This species is of the same character, but more robust than St. 



gracile, Bust (siliceous limestone of Cittiglio), 'Palaeontographica' 



vol. xlv (1898) p. 29 & pi. ix, fig 9. 



Staubalastbum sp. (PI. XXXVIII, fig. 2.) 



Test elevated in the centre. Arms conical, one only terminated 

 by a spine. Length of arms from centre ='17 mm. Breadth at base 

 = •10 mm. Length of spine = *04 mm. 



This species resembles in general outline Astractura tetracciphus, 

 Eiist, 'PalaDontographica ' vol. xlv (1898) pi. vii, fig. 3, but is without 

 the central disc. 



Genus Uncertain. 



(PI. XXXVII, fig. 8.) The nature of this is uncertain : it pro- 

 bably belongs to the genus Cypldaus. Surf ace-markings secondary. 



Sub-class NASSELLA1UA, Ehrenberg. 



Order CYRTOIDEA, HasckeL 



Sub-order M on octet i da, Hseckel. 



Genus Cybtocalpis, Haeckel. 



The latticed tests are pitcher-, bell-, or egg-shaped, without spines 

 or horn. 



Cybtocalpis cf. compacta, Haeckel. (PI. XXXVII, fig. 16.) 



Test skittle-shnped. The pores appear to be secondary. Length 

 = •22 mm. Greatest breadth =-08 mm. Breadth at base =*035 mm. 



The recent C. compacta is very similar in outline, but is not so 

 large. 1 



Cybtocalpis, sp. (PI. XXXVII, fig. 25.) 



Test very rough. Height = -14 mm. Greatest breadth = -08 mm. 

 Breadth at base =-05 mm. 



1 Haeckel, Challenger Eeport on the Eadiolaria, vol. xviii, pt. ii (1887) p. 1187 

 & pl. lii, figs. 7-8. 



