REPORT ON THE RADIOLARIA. 859 



The genus Stauropelta is distinguished from the other Phractopeltida by the 

 possession of sixteen pairs of free apophyses (on the eight tropical and the eight polar 

 spines) ; only the other four equatorial spines remain simple, without apophyses, and 

 form a simple cross in the equatorial plane. 



1. Sta.uropelta cruciata, n. sp. (PI. 133, fig. 3). 



Apophyses of the long polar and tropical spines crossed by a transverse beam, which is again 

 crossed by two perpendicular branches parallel to the apophyses ; branches with free ends, not 

 united by concrescence. At the base of each spine (in the outer shell) two large elliptical aspinal 

 pores, larger than the other irregular pores. Four equatorial spines simple, without apophyses, of 

 the same size as the other sixteen spines. 



Dimensions. Diameter of the outer shell 0'12, of the inner 0'05. 



Habitat. Indian Ocean (Madagascar), Eabbe, surface. 



2. Stauropelta stauropora, n. sp. 



Apophyses of the long polar and tropical spines crossed by a transverse beam, winch is again 

 crossed by two perpendicular branches parallel to the apophyses ; these branches are united by 

 concrescence, and form a square shield with four crossed pores, the centre of which is pierced by the 

 spine. At the base of each spine (in the outer shell) four crossed aspinal pores, corresponding to 

 those of the shield, of about the same size as the other roundish pores. Four equatorial spines, 

 simple, without apophyses, somewhat larger than the other sixteen spines. 



Dimensions. Diameter of the outer shell 01, of the inner - 04. 



Habitat. Indian Ocean, Sunda-Archipelago, Singapore, Trebing, surface. 



Suborder II. PEUNOPHRACTA. 



Definition.- Shell ellipsoidal, lenticular or diploconical, with radial beams of dif- 

 ferent size. 



Family XLII. BKLON ASPID A, n. fam. (PL 136, figs. 6-9; PL 139, figs. 8, 9). 



Definition. ACANTHARIA with a simple ellipsoidal lattice -shell, composed of the 

 branched apophyses of twenty radial spines meeting in its centre and disposed according 

 to the Mullerian law of Icosacantha. Two opposite equatorial spines larger than the two 

 others. Central capsule ellipsoidal, enclosed in the fenestrated shell. 



The family Belonaspida, formerly united by me with the Doratasj.ida (hi the 

 Prodromus, 1881, p. 468), differs from it in the ellipsoidal form of the lattice-shell and 



