REPORT ON THE RADIOLARIA. 1095 



as long as the shell and nearly vertical, parallel. The arachnoidal lattice-work is much denser 

 in the middle third (cephalis) than in tlie iipiier third (cupola) or the lower third (thorax). 



Dimamons. — Length of the shell (without appendages) 0-4:5, breadth O'S, ring O'OS long. 



^a6ito;!.^Central Pacific, Station 270, depth 2925 fathoms. 



5. Lamprospyris spenceri, n. sp. 



Shell slender, ovate, very similar to the preceding species ; differmg from it in the larger 

 cupola, which is as long as the cephalis and thorax together. The three feet are much shorter and 

 weaker, more divergent. This differs from aU four preceding species in the possession of a large 

 double apical horn ; the two horns are strong, pyramidal, straight, strongly divergent, and as 

 long as the cupola. 



Dimensions. — Length of the shell (without the appendages) 0"3, breadth 0'2, ring 0'05 long. 



Habitat. — Central Pacific, Station 2*72, depth 2600 fathoms. 



Subfamily 2. Perispyrida, Haeckel, 1881, Prodromus, p. 443. 



Definition. — ^Androspy rida without free basal feet, with three distinct joints 

 separated by two parallel transverse strictures. 



Genus 481. Amphispyris,^ Haeckel, 1881, Prodromus, p. 444. 



Definition. — Androspyrida without free basal feet, with three distinct joints, 

 separated by two transverse strictures ; lattice-work of the shell only complete in the 

 frontal ring, with large open holes on the ventral and dorsal face. 



The genus Amphispyris and the tW'O following genera arising from it, represent 

 together the peculiar small subfamily of Perispyrida. This may have originated directly 

 from Toxarium (family Tympanida, PL 88, fig. 1 ; PI. 93, figs. 18-20), the large 

 holes between its arches and rings becoming filled up by lattice-work ; in Am2)hispyris 

 this intercalated network remains incomplete on the ventral and dorsal faces, whilst in 

 Tricolospyris it becomes complete, and in Perispyris spongy. 



Subgenus 1. Amphispyrium, Haeckel. 



Definition. — On each side of the ring-plane three pairs of large annular meshes ; 

 no middle zygomatic ring is developed between the two tympanic transverse rings 

 (superior orbital and inferior maxillary ring). 



' Amphispyris = Basket with a cap on both sides ; duSii, aisu^ii. 



