REPORT ON THE RADIOLARIA. 1055 



drical, S-shaped curved, strongly divergent, with few short branches, the two pectoral feet twice as 

 long as the shell and the two tergal feet ; odd caudal foot shorter. 



Dimensions. Shell 0'08 long, 013 broad ; pectoral feet 0'2 long, tergal feet 01, caudal foot 

 0-06. 



Habitat. Central Pacific, Station 266, depth 2750 fathoms. 



2. Pentaspyris isacantha, n. sp. 



Shell subspherical, smooth, with slight sagittal stricture. Pores small, regular circular. Basal 

 plate with six large pores (?). All five feet equal, cylindrical, C-shaped curved, slightly divergent, 

 about as long as the shell. 



Dimensions. Shell 0'08 long, 0'09 broad ; feet 0'07 long. 



Habitat. Central Pacific, Station 268, depth 2900 fathoms. 



Subfamily 6. THEROSPYKIDA, Haeckel, 1881, Prodromus, p. 442. 



Definition. Z ygospyrida tetrapoda with two pairs of descending basal feet, 

 one pair corresponding to the anterior or pectoral, the other pair to the posterior or 

 tergal feet of the Hexaspyrida. 



Genus 459. Zygospyris, 1 Haeckel, 1881, Prodromus, p. 442. 

 Definition. Z ygospyrida with two pairs of lateral feet and an apical horn. 



The genus Zygospyris and the following three genera represent together the peculiar 

 subfamily of Therospyrida. These always possess four basal feet, like the Tetraspyrida ; 

 but whilst in the latter group two feet are sagittal, and two lateral, in the Therospyrida 

 there are no sagittal feet at all, but the four feet are opposed in two lateral pairs ; 

 the anterior pair corresponds to the pectoral, the posterior to the tergal feet of the 

 Hexaspyrida and Pentaspyrida ; from these latter the Therospyrida have been derived 

 by loss of the sagittal feet. 



1. Zygospyris quadrupes, n. sp. 



Shell nut-shaped, tuberculate, with deep sagittal stricture. Pores irregular roundish, on each 

 side of the ring two pairs of larger pores. Apical horn conical, straight. Four feet equal, straight, 

 divergent, conical, about as long as the shell and the horn. 



Dimensions. Shell 0'08 long, Oil broad; horn and feet 01 long. 



Habitat. South Atlantic, Station 335, depth 1425 fathoms. 



1 Zygospyris = Bilocukr basket, with paired halves ; vy, 



