REPORT ON THE RADIOLARIA. 1311 



4. Setliocapsa nidus, Ilaeekel. 



Lithopera 7iitlus pcndulits, 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 joiuts = 3:6, 

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

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



Divicnswns. — Cephalis 0'03 diameter, thorax O'OG long, 0'05 broad. 



Habitat. — Fossil in Barbados. 



_ 5. Setliocapsa 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. 



Dimensians. — Cephalis O'Oo long, 004 broad ; thorax 012 long, 012 broad. 



jBaJite^.— Central Pacific, Station 268, depth 2900 fathoms ; fossil in Barbados. 



6. Sethocapsa ampulla, n. sp. 



Shell papillate, with slight collar stiicture. 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, ii-regular, 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. 



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



fig. 6. 

 "i Lithopera amhlystauros, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berhn, 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 septimi, 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 amhlystauros, the cephalic horn, and in Lithopera oxystauros, the 

 basal part of the thorax, being broken off — or they belong to different B o t r y o d e a). 



Dimensions. — Cephalis 0'03 diameter, thorax 0'04 diameter. 



Habitat. — Fossil in Barbados. 



