REPORT ON THE RADIOLARIA. 827 



sutural pores much larger than the coronal pores, which are very small and very numerous (fifty to 

 sixty on each plate). Sutures sinuate. Eadial spines compressed, outer and inner half nearly of 

 equal length. 



Dimensions. Diameter of the shell 0'3, aspinal and sutural pores O'Ol to 0'015, coronal pores 

 0-001 to 0-002. 



Habitat. Tropical Atlantic, Station 338, surface. 



5. Coscinaspsis polypora, n. sp. (PL 136, fig. 8). 



Shell very thin walled, with smooth surface, without crests and dimples, the two aspinal pores of 

 each plate narrow, lanceolate, ten to twelve times as long as broad and half as long as the radius 

 of each plate. Coronal pores irregular, polygonal, very numerous (two hundred to three hundred 

 on each plate, commonly arranged more or less regularly in ten to twelve series parallel to the longi- 

 tudinal diameter of the aspinal spines (ten to twenty pores in each series). Sutural pores irregular, 

 polygonal, very numerous. Eadial spines very thin and long, cylindrical. 



Dimensions. Diameter of the shell 0'24 ; length of the aspinal pores 0'04, breadth 0'004 ; 

 coronal and sutural pores 0'002 to O'Ol. 



Habitat. Tropical Atlantic, Station 349, surface. 



6. Coscinaspis orthopora, n. sp. 



Shell very thin walled, with smooth surface, without crest and dimples. All pores of nearly 

 equal size and form ; quadrangular, mostly rectangular ; one hundred to two hundred, separated 

 by two systems of parallel bars, perpendicular one to another, occur in each plate. Sutural pores 

 mostly triangular. Eadial spines very thin and long, cylindrical, somewhat compressed. (Similar 

 to those of Phatnaspis lacumaria., PI. 136, fig. 9, but spherical, not ellipsoidal.) 



Dimensions.- Diameter of the shell 0'2, pores O'OOS to 0'012. 



Habitat. Central Pacific, Station 272, surface. 



7. Coscinaspis parmipora, n. sp. (PI. 137, fig. 9). 



Craniaspis parmipora, Haeckel, 1866, Manuscript. 

 Dorataspis parmipora, Haeckel, 1881, Prodromus, Atlas. 



Shell thin walled, with smooth surface, without crests and dimples. There are no sutural pores, 

 since all twenty plates are connected by perfect sinuate sutures (therefore this excellent species may 

 perhaps better represent a peculiar genus, called by me in 1866 Craniaspis). All pores are parmal 

 pores ; each plate with two elliptical aspinal pores, which are twice to five times broader than the 

 numerous, roundish irregularly scattered coronal pores (thirty to fifty occurring on each plate). The 

 radial spines are quite internal, that is, not prolonged on the outside of the shell ; in this respect 

 they resemble those of SphcerocMpsa. 



Dimensions. Diameter of the shell 016, aspinal pores O'Ol, coronal pores 0'002 to 0'005. 



Habitat. North Atlantic, Canary Islands (Lauzerote), surface. 



