REPORT ON THE RADIOLARIA. 645 



1. Tetrapyle circularis, n. sp. (PL 9, fig. 8). 



Cortical shell rough, without radial spines. Lateral girdle circular, therefore the longitudinal 

 axis is equal to the transverse. Four gates kidney-shaped, twice as broad as high. In each half 

 wing of the transverse girdle six to seven longitudinal rows of irregular, roundish pores. 



Dimensions. Medullary shell 0'05 long, 0'04 broad ; cortical shell 015 long and broad ; gates 

 0-04 high, 0-08 broad. 



Habitat. Pacific, central area, Station 263, surface. 



2. Tetrapyle circopyle, n. sp. 



Cortical shell smooth, without radial spines. Lateral girdle elliptical, one and a half times as 

 long as broad. Four gates nearly circular. On each half wing of the transverse girdle four to 

 five rows of subregular, circular pores. (Similar to Tetrapyle pleuracantha, PI. 9, fig. 9, but without 

 lateral spines.) 



Dimensions. Medullary shell 0'04 long, 0'03 broad ; cortical shell 016 long, Oil broad ; gates 

 0'05 high and broad. 



Habitat. Pacific, central area, Station 268, depth 2900 fathoms. 



3. Tetrapyle quadriloba, Haeckel. 



Tetrapyle quadriloba, Haeckel, 1862, Monogr. d. Radiol., p. 436. 



Scliizomma quadrilobum, Ehrenberg, 1860, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 815 ; 

 AbhandL d. k. Akad. d. Wiss. Berlin, 1872, Taf. x. figs. 12-14. 



Cortical shell thorny, without regular, radial spines. Lateral girdle elliptical, one and a half 

 times as long as broad. Four gates nearly circular. On each half wing of the transverse girdle 

 three to four rows of irregular, roundish pores. 



Dimensions. Medullary shell 0~06 long, 0'04 broad ; cortical shell 016 long, 01 broad ; 

 diameter of the gates 0'05. 



Habitat. Cosmopolitan ; Mediterranean, Atlantic, Indian Ocean, Pacific, surface. 



4. Tetrapyle nephropyle, n. sp. 



Cortical shell thorny, without radial spines. Lateral girdle elliptical, one and 'a third times as 

 long as broad. P\>ur gates kidney-shaped, nearly twice as broad as high, with two prominent polar 

 spines on the poles of the longitudinal axis of the medullary shell. On each half wing of the 

 transverse girdle three to four longitudinal rows of large roundish pores. 



Dimensions. Medullary shell O'OG long, 0'04 broad; cortical shell D'24 long, 018 broad; gates 

 0-05 high, 0-08 broad. 



Habitat. Pacific, central area, Station 271, depth 2425 fathoms. 



