REPORT ON THE RADIOLARIA. 1177 



5. Calpophcena petalospyris, n. sp. 



Shell campanulate, tuberculate, with irregular, roundish pores. Apical horn conical, shorter 

 than the shell. (Basal plate with nine pores ?) Corona with twelve to twenty broad, lamellar, 

 truncate, vertical feet, of different sizes, somewhat irregular. 



Dimensions. Shell O08 long, 0'09 broad ; horn and feet 0'07 to 012 long. 



Habitat. Central Pacific, Station 265, depth 2900 fathoms. 



Subgenus 2. Cladocorona, Haeckel, 1881, Prodromus, p. 430. 

 Definition. Feet branched or forked. 



6. Calpophcena tetracorethra, n. sp. 



Shell subspherical, smooth, with irregular, roundish pores. Basal plate with four larger pores. 

 Apical horn and the four divergent basal feet of equal size and similar form, three to four times as 

 long as the shell, slender, bristle-shaped, curved, in the distal half irregularly branched. (Very 

 similar to the remarkable Tctraspyris tetracorethra, PL 53, figs. 19, 20, but with shorter appendages 

 and with simple spherical shell, which exhibits no trace of sagittal ring and constriction.) 



Dimensions. Shell 012 diameter, horn and feet 0'3 to 0'5 long. 



Habitat. Central Pacific, Station 271, depth 2425 fathoms. 



7. Calpophcena hexacorethra, n. sp. 



Shell subspherical, smooth, similar to the preceding species. Basal plate with six pores. 

 Apical horn and the six divergent feet twice to three times as long as the shell, bristle-shaped, 

 irregularly curved and branched. (Similar to Hexaspyris hexacorethra, PI. 95, fig. 8, but without 

 sagittal ring and constriction.) 



Dimensions. Shell Oil long, 013 broad; horn and feet 0'2 to 0'3 long. 



Habitat. Central Pacific, Station 274, depth 2750 fathoms. 



Genus 525. Archiphcena, 1 Haeckel, 1881, Prodromus, p. 429. 



Definition. A rchipheenida (vel Monocyrtida multiradiata clausa), with simple 

 internal cavity of the shell, without apical horn and axial columella. 



The genus Archiphcena has the same simple cavity of the shell as the preceding 

 Calpophcena, but differs from it in the loss of the apical horn. It bears therefore 

 to the latter the same relation that Gorgospyris does to Petalospyris. The two 

 former genera may be derived from the two latter by loss of the sagittal ring and 

 constriction. 



1 Archiphcena = Primordial shell ; b^w, Qatva. 



(ZOOL. CHALL. EXP. PART XL. 1886.) Rr 148 



