REPORT ON THE RADIOLARIA. 1279 



3. Anthocyrtidium matricaria, n. sp. 



Shell campanulate, rough, very similar to the preceding species, but differing in the straight, 

 large, pyramidal horn of the cephalis (as long as the shell), and in the longer feet, which are twelve 

 to fifteen in number, little curved at the distal end, pointed, and about as long as the shell. Length 

 of the two joints = 2:6, breadth = 3:8. Differs from the similar Anthocyrtium eentaurea, Ehrenberg 

 (1875, loc. cit, Taf. vi. fig. 5), mainly in the prominent ring of the peristome. 



Dimensions. Cephalis, 0'02 long, 0'03 broad ; thorax 0'06 long, 0'08 broad. 



Habitat. Fossil in Barbados. 



Genus 569. Carpocanium, 1 Ehrenberg, 1847, Monatsber. d. k. preuss. 

 Akad. d. Wiss. Berlin, p. 54. 



Definition. S ethophormida (vel Dicyrtida multiradiata aperta) without 

 thoracic ribs, with numerous terminal feet around the mouth (six to twelve or more). 

 Cephalis hidden in the thorax, without apical horn. 



The genus Carpocanium, very common, and rich in numerous living and fossil 

 species, was formerly placed by me among the true Monocyrtida, since an external 

 constriction is not visible (Monogr., 1862, p. 290). Afterwards (in 1879) Eichard Hertwig 

 demonstrated that the cavity of the ovate shell, externally simple, is divided by an 

 internal transverse septum into two joints, the upper of which is the flat rudimentary 

 cephalis (Organism, d. Eadiol., p. 79 ; compare also Biitschli, 1882, loc. cit., p. 535). 

 Indeed this septum, with four central crossed cortinar beams, is a true collar septum, 

 and Carpocanium has been derived from Anthocyrtis or Desmospyris by reduction of 

 the cephalis, which is very flat and perfectly hidden in the uppermost part of the 

 thorax. The apical horn is lost. If the internal septum were to become lost, the genus 

 would pass over into Carpocanistrum. 



Subgenus 1. Carpocanarium, Haeckel. 



Definition. Peristome-corona composed of six feet (three primary perradial alter- 

 nating with three secondary interradial). 



1. Carpocanium caly codes, Stohr. 



Carpocanium call/codes, Stohr, 1880, Palaeontogr., vol. xxvi. p. 96, Taf. iii. fig. 8. 



Shell urceolate, smooth, nearly twice as long as broad, with hemispherical vaulted cephalis. 

 Length of the two joints = 3 : 16, breadth =5 : 10. Pores regular, circular, as broad as the bars, 



1 Carpoeanium Fruit-basket ; xacpirvs. natitov. 



