Vol. 51.] RADIOLARIAN ROCKS IN THE LOWER CCJLM MEASURES. 637 



Xiphostylus? sp. c. PI. XXV. fig. 13. The test is depressed 

 spheroidal, -11 mm. in diameter; at one pole is a short conical 

 spine, at the other a double spine apparently springing from a 

 common base, about •! mm. in length. Ramshorn Down. 



Genus Dorysphjera, Hinde. 

 The test is a simple latticed sphere with a single radial spine. 



Dorysphcera sp. a. PL XXVI. fig. 9. The test is '18 mm. in dia- 

 meter ; the spine conical, pointed, *11 mm. in length. Carzantic 

 Quarry, near Launceston. A form somewhat smaller occurs at 

 Ramshorn Down. 



Dorysphcera sp. b. PL XXVI. fig. 5. The test is -22 mm. in dia- 

 meter and '02 mm. in thickness; spine stout at base, tapering 

 slightly and obtusely ended, length -18 mm., thickness at base 

 •03 mm. Ashbrittle, West Somerset. 



Genus Acanthosph^ra, Haeckel. 



The test is a simple latticed sphere, with numerous simple radial 

 spines of equal size. 



Acanthosphcera laxa, sp. nov. PL XXVI. fig. 6. The test is 

 •16 mm. in diameter ; the lattice-structure is not shown, but within 

 there are traces of six rods radiating from an excentric point. From 

 the margins of the test five long slender spines extend in different 

 directions ; the longest measures *5 mm. This form is not uncommon 

 at Ramshorn Down, but the spines are usually displaced and the test 

 distorted. 



Genus SrAUROLONCHE, Haeckel. 



The test consists of two concentric latticed spheres with four similar 

 radial spines. 



Staurolonche sp. a. PL XXV. fig. 14. The outer test is "18 mm. 

 in diameter, and the inner one "05 mm. Prom the inner sphere two 

 rays extend to just beyond the outer test, where they terminate in 

 minute points ; the other two rays or spines are not preserved. 

 Hedge-section at Lawell House, Chudleigh. 



Genus Stylosphjsra, Haeckel. 



Test of two concentric latticed spheres, with a free radial spine at 

 each pole. 



Stylosphcera sp. a. PL XXV. fig. 15. The outer sphere is -13 mm. 

 in diameter, and the inner - 06 mm. ; the spine at one pole is slender 

 and -1 mm. in length, the opposite spine is stouter and broken off 

 near the base. Ramshorn Down. 



