REPORT ON THE RADIOLARIA. 1461 



a coronal of six strong ascending spines. Peristoine beyond the stricture of the mouth somewhat 

 dilated, with nine triangular, divergent teeth (broken off in the specimen figured). 



Dimensions. Length of the shell (with four joints) 0'18, breadth 0'09. Length of the single 

 joints, a 0'02, I 0'04, c 0'04, d 0'08. 



Habitat. Western Tropical Pacific, Station 224, depth 1850 fathoms. 



4. Cyrtophormis aculeata, n. sp. 



Shell spiny, slenderly ovate, with five distinct strictures, each with a girdle of spines. The three 

 middle joints are of nearly equal length, each half as long as the second, and one-third as long as 

 the sixth joint. The fifth joint is the broadest, twice as broad as the constricted mouth. Pores 

 regular, circular. Cephalis conical, with a bunch of strong, divergent spines. Peristome with nine 

 strong, conical, vertical, parallel teeth. 



Dimensions. Length of the shell (with six joints) P 18, breadth 0'08. Length of the first joint 

 0-02, the second 0'04, the three following 0'02, the sixth 0'06. 



Habitat. North Pacific, Station 241, depth 2300 fathoms. 



5. Cyrtophormis acutata, Haeckel. 



Eucyrtidium acutatum, Stohr, 1880, Palasontogr., vol. zxvi. p. 105, Taf. iv. fig. 11. 



Shell rough, spindle-shaped, with six annular strictures. The third, fourth, and seventh joints 

 are equal in length, three times as long as the first and the fifth joints. The fourth joint is the 

 broadest, four times as broad as the constricted mouth. Pores irregular, roundish. Cephalis small, 

 subspherical, with a short conical horn. Peristome with nine (?) irregular, triangular, little 

 convergent teeth. 



Dimensions. Length of the shell (with seven joints) 0'22, breadth Oil. Length of the third, 

 fourth, and seventh joints 0'04. 



Habitat. Fossil in Tertiary rocks of Sicily ; Grotte (Stohr). 



Subgenus 3. Acanthocyrtis, Haeckel. 

 Definition. Shell with numerous (twelve to twenty or more) terminal feet. 



6. Cyrtophormis cylindrica, n. sp. (PL 77, fig. 17). 



Shell rough, subcyliudrical, with three annular septa. The fourth cylindrical joint is four times 

 as long as the second and the third joints. These three joints are nearly equal in breadth. Pores 

 small and numerous, almost square, in regular, transverse rows ; two to three in the first joint, five to 

 six in the second and in the third, fourteen to sixteen in the fourth joint. Cephalis flat, cap-shaped, 

 with a short, pyramidal horn. Peristome half as broad as the shell, hyaline, with a coronal of 

 numerous, very delicate, vertical feet. 



