REPORT ON THE RADIOLARIA. 1029 



13. Tripospyris semantidium, n. sp. 



Shell nut-shaped, thorny, with sharp sagittal stricture and subcircular ring. Basal plate with 

 three pairs of large pores. Facial and occipital plates each with three pairs of large squarish 

 pores. Lateral pores small and numerous, irregular roundish. Apical horn half as long as the 

 shell and the three feet ; all four spines straight, cylindrical, with thickened club-shaped end. 



Dimensions. Shell 012 long, 013 broad ; horn 0'06 long, feet 015. 



Habitat. Tropical Atlantic, Station 347, depth 2250 fathoms. 



14. Tripospyris eucolpos, n. sp. (PI. 84, fig. 4). 



Shell thorax-shaped, smooth, with two vaulted bosoms, separated by a deep sagittal stricture 

 and an internal primary ring. Basal plate constricted, with three pairs of collar pores. The 

 other lattice-work with subregular circular pores. Apical horn and the three feet shorter than the 

 shell, straight, divergent ; their inner half thinner, cylindrical, smooth, their outer half an ovate 

 dimpled cone. 



Dimensions. Shell 01 long, 013 broad ; horn and feet 0'06 long. 



Habitat. Indian Ocean, Cocos Islands (Eabbe), surface. 



15. Tripospyris tribrachiata, Haeckel. 



Cladospyris tribrachiata, Ehrenberg, AbhandL d. k. Akad. d. Wiss. Berlin, p. 68, Tai xxi. 

 fig. 8. 



Shell subspherical, smooth, with slight sagittal stricture and numerous, very small circular 

 pores. Basal plate with numerous small pores. Apical horn and the three divergent feet very 

 large and stout, straight, three-sided prismatic, with dentate edges, two to three times as long as 

 the shell. 



Dimensions. Shell diameter 0'05 ; horn and feet 01 to 015 long. 



Habitat. Fossil in Barbados. 



16. Tripospyris furcata, n. sp. (PL 83, fig. 11). 



Shell nut-shaped, smooth, with deep sagittal stricture and broad ring. Basal plate with three 

 pairs of small pores. Facial and occipital faces each with a pair of very large holes. Apical horn 

 and caudal foot simple conical, two pectoral feet forked or irregularly branched. 



Dimensions. Shell 0'08 long, 012 broad ; horn and feet O'Oo long. 



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



Genus 442. Triceraspyris, 1 Haeckel, 1881, Prodromus, p. 441. 

 Definition. Z ygospyrida with three basal feet and three coryphal horns. 



The genus Triceraspyris has arisen from the preceding ancestral Tripospyris by the 

 development of two paired frontal horns, so that the shell here bears six appendages, 



1 Triceraspyris = Basket with three horns ; 



