REPORT ON THE RADIOLARIA. 1421 



The genus Lophocorys differs from its ancestral form, Theocorys, only in the 

 armature of the cephalis, bearing either two divergent horns, or a corona of several 

 radial horns. In two , species there are four horns on the apex, a larger vertical 

 (occipital) horn being surrounded by three smaller, upwards divergent horns. 



1. Lophocorys astrocephala, n. sp. (PI. 69, fig. 9). 



Shell smooth, inversely ovate, with deep collar and slight lumbar stricture. Length of the 

 three joints = 3 : 7 : 6, breadth =4 : 11 : 10. Cephalis subspherical, stellate, densely covered with 

 numerous (ten to twenty or more) divergent, large, slenderly conical horns, the longest of which reach 

 the length of the shell. Thorax campanulate, with small, regular, circular pores. Abdomen taper- 

 ing towards the constricted mouth, in the upper half with the same pores, in the lower half with 

 smaller, scarce pores, or nearly hyaline. 



Dimensions. Length of the three joints, a 0'03, b 0'07, c 0'06 ; breadth, a 0'04, b Oil, c 01. 



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



2. Lophocorys acanthocephala, Haeckel. 



Eucyrtidium acanthocepludum, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, 

 Taf. ix. fig. 8. 



Shell rough, bottle-shaped, with two slight strictures. Length of the three joints = 5 : 11 : 7, 

 breadth = 4 : 12 : 10. Cephalis conical, with a large pyramidal horn of the same length, and three 

 smaller divergent accessory horns at the base of the three edges of the latter. Thorax campanulate, 

 nearly as long as the tapering abdomen (which in the figure of Ehrenberg is broken off). Pores 

 regular, circular, quincunciaL 



Dimensions. Length of the three joints, a 0'05, b Oil, c 0'07 ; breadth, a 0'04, b 012, c 01. 



Habitat. Fossil in Barbados. 



3. Lophocorys bicornis, Haeckel. 



Eucyrtidium Ucorne, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 70, 

 Taf. xi. fig. 7. 



Shell smooth, almost spindle-shaped, with two slight strictures. Length of the three joints = 

 2 : 8 : 3, breadth = 3:5:4. Cephalis hemispherical, with two stout, pyramidal, divergent horns of 

 twice the length. Thorax ovate, with seven to eleven transverse rows of small, regular, circular 

 pores (often very scarce in the upper half). Abdomen with two to four transverse rows of the same 

 pores. Mouth constricted, half as broad as the thorax. 



Dimensions. Length of the three joints, a 0'02, b 0'08, c 0'03 ; breadth, a 0'03, b 0'05, c 0'04. 



Habitat. Fossil in Barbados. 



