REPORT ON THE RADIOLARIA. 1269 



Genus 566. Anthocyrtis, 1 Ehrenberg, Monatsber. d. k. preuss. Akad. d. Wiss. 



Berlin, 1847, p. 54. 



Definition. S ethophormida (vel Dicyrtida multiradiata aperta) without 

 thoracic ribs, with nine terminal feet around the mouth. Cephalis free, with an apical 

 horn. 



The genus Anthocyrtis (in the original definition of Ehrenberg) contained all Dicyrtida 

 without thoracic ribs, with terminal feet. We here restrict the definition to those Setho- 

 phormida in which the number of free terminal feet is constantly nine (three primary 

 perradial and three alternate pairs of secondary interradial feet). Anthocyrtis may be 

 derived either directly from Patagospyris by loss of the sagittal ring, or from Lychno- 

 canium by interpolation of three secondary feet. 



Subgenus 1. Anthocyrtella, Haeckel. 



Definition. Feet of the peristome-corona divergent, their basal distance less than 

 their terminal distance. 



1. Anthocyrtis mespilus, Ehrenberg. 



Anthocyrtis mespilus, Ehrenberg, 1854, Taf. xxxvi. fig. 13 ; Abhandl. d. k. Akad. d. Wiss. 

 Berlin, 1875, p. 66, Taf. vi. fig. 4 (not 5). 



Shell smooth, with distinct collar stricture. Length of the two joints = 1 : 5, breadth = 2:6. 

 Cephalis hemispherical, with a stout pyramidal horn of twice the length. Thorax nearly hemi- 

 spherical, with regular, circular, quincuncial pores. Mouth scarcely constricted, with nine divergent, 

 triangular, lamellar feet, about as long as the thorax. 



Dimensions. Cephalis 0'012 long, O02 broad ; thorax 005 long, 0'06 broad. 



Habitat. Fossil in Barbados. 



2. Anthocyrtis fur cata, Ehrenberg. 



Anthocyrtis furcata, Ehrenberg, 1875, AbhandL d. k. Akad. d. Wiss. Berlin, p. 64, Taf. vi. 

 fig. 2. 



Shell smooth, with deep collar stricture. Length of the two joints = l:5, breadth = 2:6. 

 Cephalis hemispherical, with a short pyramidal horn of half the length. Thorax hemispherical, 

 with large, irregular, roundish pores. Mouth scarcely constricted, with nine divergent, curved, 

 slender feet, which are about as long as the shell, and forked at the distal end. 



Dimensions. Cephalis O'Ol long, 0'02 broad ; thorax 0'05 long, 0'06 broad. 



Habitat. Fossil in Barbados. 



1 Anthocyrtis = Flower-basket ; eLv6o(, > 



