EEPOET ON THE EADIOLARIA. 293 



crests between them, their outer ajjertiire three to four times as broad as the inner; twelve to fifteen 

 pores on the half equator. Surface prickly. 



Dimensions. — Longer a.xis of the eUipsoiJ 0'14, shorter axis Oil; outer aperture of the pores 

 0-01 to 0-012, inner aperture 0-003 to 0-004 



Hahitaf. — South Atlantic, Station 332, depth 2200 fathoms. 



10. CeneUlpsis ohiuiiga, n. sp. 



Proportion of the longer a.xis to the shorter = 2 : 1. Network of the thick wall irregular, with 

 roundish pores of different size and form. Pores with prominent conical edges, about as broad as 

 the bars ; twenty to twenty-five on the half equator. Sometimes eacli pore is prolonged into a short 

 conical tubulus. 



Dimensions. — Longer axis of the ellipsoid 0-22, shorter axis 0-12 ; pores and bars O'OOS to 

 0-012. 



Habitat. — Pacific, central area, Station 265, depth 2900 fathoms. 



Geuus 123. Axellipsis,^ u. gen. 



Definition. — Ellip,sida with simple ellipsoidal shell, without radial spines 

 or polar tubes, but with an inner transverse axial rod, which corresponds to the 

 shorter axis of the ellipsoid. 



The genus Axellipsis differs from the simple Cendlipsis in a very peculiar 

 character, namely, the presence of an inner siliceous bar marking the minor axis of the 

 ellipsoidal shell. If in some forms of Dnippula {e.g., PL 39, fig. 3) we remove 

 the central medullary shell and prolong both beams (connecting it with the cortical 

 shell) till they unite in the centre, we shall arrive at Axellipsis. Therefore Axellipsis 

 may be derived in the same way from Druppida as Axoprvmiia is from Lithatraetus, 

 by phyletic loss of the medullary shell. 



1. Axellipsis perforata, n. sp. 



Proportion of the major axis of the ellipsoid to the minor =3 : 2. Pores of the shell regular, 

 circular, twice as Ijroad as the bars ; ten to twelve on the half equator. Surface smooth. 

 Dimensions. — Longer axis of the shell 0-12, shorter axis O'OS ; pores 0*006, bars 0-003. 

 Hahitat. — Central area of the Pacific, Station 266, depth 2750 fathoms. 



2. Axellipsis lobata, n. sj). 



Proportion of the major axis to the minor = 5:4. Meshes of the shell irregular, roundish, 

 lobed, with three to six indentations (each mesh formed by the confluence of three to six, commonly 



1 .4xeZ%sis= Ellipsoid with an a.xial beam ; x^i;, 'iyCKttii/i;. 



