REPORT ON THE RADIOLARIA. 1311 



4. Sethocapsa nidus, Haeckel. 



Lithapera nidus pendulus, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 78, Taf. iii. 



fig. 7. 



Shell smooth, pear-shaped, with distinct collar stricture. Length of the two joints = 3:6, 

 breadth = 3:5. Cephalis subspherical, with a large, straight, pyramidal horn of twice the length, 

 and scarce small pores. Thorax ovate, also with very small and scarce pores. 



Dimensions. Cephalis 0'03 diameter, thorax 0'06 long, 0'05 broad. 



Habitat. Fossil in Barbados. 



5. Sethocapsa bulla, n. sp. 



Shell spiny, with slight collar stricture. Length of the two joints = 3 : 12, breadth = 4 : 12. 

 Cephalis hemispherical, with small, scarce pores, and a conical horn of the same length. Thorax 

 nearly spherical, with large, subregular, circular, quincuncial pores, twice as broad as the bars. 



Dimensions. Cephalis 0'03 long, 0'04 broad ; thorax 012 long, 012 broad. 



Habitat. Central Pacific, Station 268, depth 2900 fathoms ; fossil in Barbados. 



6. Sethocapsa ampulla, n. sp. 



Shell papillate, with slight collar stricture. Length of the two joints = 1:5, breadth = 1:5. 

 Cephalis hemispherical, hyaline, without pores, with a large pyramidal horn of twice the length. 

 Thorax nearly spherical, with large, irregular, roundish, lobulated pores. 



Dimensions. Cephalis 0'03 long, 0'04 broad ; thorax 015 long, 015 broad. 



Habitat. Central Pacific, Station 265, depth 2900 fathoms. 



7. Sethocapsa staurocephala, Haeckel. 



1 Lithopera oxystauros, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 78, Taf. iii. 



fig. 6. 



ILithopera amblystauros, Ehrenberg, 1875, AbhandL d. k. Akad. d. Wiss. Berlin, p. 78, Taf. iii. 



fig- 5. 



Shell smooth, with slight collar stricture. Length of the two joints =3 : 4, breadth = 3 : 4. 

 Cephalis large, ovate, with a conical horn of the same length, small scarce pores, and an internal 

 frontal septum, composed of two crossed beams, a vertical and a horizontal Thorax little larger 

 than the cephalis, ovate, with irregular, small and scarce pores. (The two figures of Ehrenberg are 

 either incomplete in Lithopera amblystauros, the cephalic horn, and in Lithopera oxystauros, the 

 basal part of the thorax, being broken off or they belong to different Botryodea). 



Dimenswns.^Gephalis 0'03 diameter, thorax 0'04 diameter. 



Habitat. Fossil in Barbados. 



