RErOET ON THE EADIOLARIA. 1201 



21. Dk-tyophimus hiitscldii, u. sp. (PI. 60, fig. 2). 



Lamprotripwi Iwrviilua, Haeckel, 1881, Prodromus et Atlas. 



Shell spiny, flatly pyramidal, with deep collar stricture. Relative length of the two joints = 1:2, 

 breadth = 1:5. Cephalis subspherical, with numerous long, bristle-shaped spines and a larger ranrified 

 horn. Thorax also spiny, flatly vaulted, with large, subregular, hexagonal meshes and thin bars ; its 

 three spiny ribs prolonged into three very long and thin, prismatic, widely divergent feet, twice to 

 four times as long as the thorax. 



Dimcnsiom. — Cephalis 0-04 long, O'Ol broad; thorax 0-08 long, 0-2 broad. 



Habitat. — South Pacific, Station 284, surface. 



22. Dictyophimus hertwigii, n. sp. (PL 60, fig. 3). 



Lamprotrq^us spinosus, Haockel, 1831, Prodromus et Atlas. 



SheU spiny, flatly pyramidal, with sharp collar stricture. Relative length of the two joints = 1:2, 

 breadth = 1:5. Cephalis subspherical, with irregular roundish pores, numerous small spines and 

 a large, oblique, prismatic horn of the same length, bearing on its distal end a bunch of small 

 divergent spines. Thorax pyramidal, with larger irregular polygonal pores and thin bars ; its three 

 strong, widely divergent ribs spiny, straight, and prolonged into three prismatic slender feet of the 

 same length. Central capsule with three lobes depending into the thorax. 



Dimensio7is. — Cephalis 0-04 long, 0-04 broad ; thorax O'OS long, 0-2 broad. 



Habitat. — Central Pacific, Stations 270 to 274, surface. 



Genus 535. Tripocyrtis,^ n. gen. 



Definition. — Sethopilida (vel Dicyrtida triradiata aperta) wdtli three complete 

 thoracic ribs, prolonged into three latticed divergent feet on the peristome. Cephahs 

 with an apical horn. 



The genus Tripocyrtis has been derived from the preceding Dictyophimus by com- 

 plete fenestration of the three basal feet, which throughout their whole length become 

 united by complete lattice-work. This genus is closely allied to Pleetaniscus. 



1. Tripocyrtis plagoniscus, u. sp. (PI. 60, fig. 10). 



CephaUs subspherical, with large, roundish meshes and a stout, three-sided pyramidal, irregularly 

 branched horn of twice the length. Thorax with a small number of large, irregular, polygonal 

 meshes and three stout curved ribs about as long as the cephahc horn. 



Dim.ensians. — Cephalis 0-06 long, 0-07 broad ; thorax Oil long, 016 broad. 



Habitat. — Central Pacific, Station 266, surface. 



^ Tripocyrtis = Basket with a tripod ; rj/ro;, xi/jt/;. 



(ZOOL. CHALL. EXP. — PART XL. — 1886.) Pr 151 



