REPORT ON THE RADIOLARIA. 1707 



the shell. The tubular peristome is about half as long as the shell, bottle-shaped, nearly three- 

 sided prismatic, and bears three very long spinulate teeth, which in the lower half are parallel, in 

 the upper shghtly curved and diverging, at the base pear-shaped. Three ovate basal pores in the 

 inflated base of each foot and each tooth. 



Dimensions. — Length of the shell 2 5, breadth 1'5. 



Habitat. — South Pacific, Station 295, depth 1500 fathoms. 



3. Tuscarora wyvillei, n. sp. (PI. 100, figs. 3, Sa—3c). 



Shell subspherical, pellucid, thinner and more fragile than in the other species of the genus, with 

 three aboral perradial feet in the lower third, and three interradial teeth around the wide mouth. 

 The three feet are straight, conical, widely divergent, shorter than the shell, and arise from its 

 lower third ; on the inflated base of eacli four small ovate pores. The three teeth, alternating 

 with them, are straight, cylindrical, arise from the margin of the mouth and diverge obliquely 

 upwards. On the base of each foot four opposite cordate pores of very unequal size. 



Dimensions. — Length of the shell 1'5, breadth 1'4. 



Habitat. — South Pacific, Station 291, depth 2250 fathoms. 



4. Tuscarora tetrahedra, John Murray (PI. 100, figs. 4, 4a). 



Tuscarora tetrahedra, John Murray, 1879, in litteris, Narr. ChaU. Exp., vol. i. p. 226, pi. A, 

 fig. 19. 



Shell tetrahedral or three-sided pyramidal, with three perradial basal feet, and three alternate, 

 interradial, circoral teeth. The three rounded edges of the pyramid are prolonged directly over the 

 aboral base into the three short, divergent, conical, basal feet, which are smooth and scarcely one- 

 fourth as long as the shell. The base of each foot is pierced by four small crossed pedal pores. The 

 narrow mouth, on the aj)ex of the pyramid, is surrounded by three short and broad, triangular, 

 spinulate teeth, each of which bears three slender, triangular, dental pores. 



Dimensions. — Length of the shell 2'5, breadth 2'0. 



Habitat. — Tropical Atlantic, Station 348, depth 2450 fathoms. 



Subgenus 2. Tuscaretta, Haeckel. 



Definition — Shell -with three perradial equidistant feet, and with two circoral teeth, 

 which are opposite in the radius of the odd dorsal foot ; therefore a dorsal and a ventral 

 tooth. 



5. Tuscarora tuhulosa, John Murray (PI. 100, figs. 5, 5a, 5b). 



Tuscarora tuhulosa, John Murray, 1879, in litteris, Narr. Chall. Exp., vol. i. p. 226, pi A, 

 fig. 17. 



Shell subspherical, with three lateral perradial feet on the upper half of the shell (above the 

 equator), and two parallel vertical teeth on the mouth. The three feet arise between the upper and 



