REPORT ON THE RADIOLARIA. 1407 



5. Tlieocyrtis paupera, Haeckel. 



Euctjrtidium pauperu7n, Ehrenberg, 1875, Abhandl. d. k. AkaJ. d. "Wiss. Berlin, p. 72, Tiif. xi. 

 fig. 13. 



Shell slender, cylindrical, smooth. Length of the three joints = 1 : 2 : G, breadth = 1:3:3. 

 Cephalis hemispherical, with a stout conical horn of twice the length. Thorax truncate, conical' 

 Abdomen cylindrical. Pores very small, regular, circular, disposed in transverse rows, one or two 

 in the thorax, three to five in the abdomen. (Distance between the rows twice as great as in the 

 preceding nearly related species.) Mouth wide open, truncate. 



Dimensions. — Length of the three joints, a O'Ol, b 0'02, c 0'06 ; breadth, a 0'015, h 0-03, 

 c 0-03. 



Habitat. — "Western Tropical Pacific, Station 225, depth 4475 fathoms ; also fossil in Barbados 

 and Sicily. 



6. Theocyrtis microtheca, Haeckel. 



Eueyrtidium viicrotheca, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berhn, p. 72, Taf. xi. 



fig. 10. 

 Eueyrtidium hillabi/, Ehrenberg, 1875, Abhandl. d. k. Akad. d. Wiss. Berlin, p. 72, Taf. xi. 



fig. 8. 



Shell cylindr'ical, a little rough. Length of the three joints = 1:3:4, breadth = 1:3:3. 

 Cephalis subspherical, with a small conical horn. Thorax hemispherical or campanulate. Abdomen 

 cylindrical, with wide open truncate mouth. Pores subregular, circular, quincuncially disposed, of 

 medium size, rudimentary or wanting in the cephalis. 



Dimensions. — Length of the three joints, a 0-015 to 0-02, b 0-03 to 0-05, c 0-05 to 008 ; breadth, 

 a 0-02 to 0-025, b 0-05 to 0-06, c 0-05 to 0-06. 



Habitat. — Central Pacific, Stations 263 to 274, depth 2350 to 2925 fathoms; also fossil in Barbados. 



Subgenus 2. Theocorusca, Haeckel. 

 Definition. — Pores of the thorax and the abdomen of different sizes or forms. 



7. Theocyrtis macroceros, n. sp. (PL 69, fig. 13). 



Shell almost cylindrical, smooth. Length of the three joints =1:2:5, breadth = 2:3:4. 

 Cephalis hemispherical, with a very large cylindrical horn, once or twice as long as the shell. 

 Thorax truncate, hemispherical. Aljdomen cylindrical, only slightly contracted towards both ends. 

 Two girdle strictures deep. Pores small, subregular, circular, more irregular and twice to three times 

 as large in the abdomen as in the thorax, disposed in transverse rows, five to six in the thorax, 

 eight to ten in the abdomen. 



Dimensions. — Length of the three joints, a 0-02 to 0-03, b 0-04 to 0-05, c 0-1 to 0-12 ; breadth, 

 a, 0-04, b 0-07, c 0-08. 



Habitat. — South Atlantic, Station 335, depth 1425 fathoms ; also fossil in Barbados. 



