REPORT ON THE RADIOLARIA. 1197 



very small pores. Thorax nearly hemispherical, with three vaulted bosoms between the three decurrent 

 ribs, which are prolonged into three nearly parallel and vertical feet of about the same length. Pores 

 subregular, circular, of medium size. This species is very similar to Lychnodictyum challengeri, 

 Haeckel, but differs in the smaller straight horn and the longer solid feet, which are not fenestrated. 



Dimensions. — Cephalis 0'03 long, 0'04 broad ; thorax 0'09 long, 013 broad. 



Habitat. — Tropical Atlantic, Station 347, surface. 



7. Dictyophimus lasanum, n. sp. (PI. 61, fig. 5). 



Shell nearly pear-shaped, with distinct collar stricture. Pielative length of the two joints = 

 1 : 3, breadth =1:3. Cephalis hemispherical, with a conical horn of the same length. Thorax 

 nearly spherical, on both poles truncate and constricted, with three decurrent curved ribs and 

 small regular circular pores. The prolongations of the ribs form three divergent pyramidal 

 straight feet, nearly as long as the thorax. 



Dimensions. — Cephalis 0'02 long, 0'03 broad ; thorax 0-09 long, 0'09 broad. 



Habitat. — South Atlantic, Station 332, depth 2200 fathoms. 



8. Dictyojyhimus longipes, n. sp. (PL 61, fig. 3). 



Shell three-sided pyramidal, with distinct collar stricture. Pielative length of the two joints = 1:4, 

 breadth = 2 : 6. Cephalis hemispherical, with a rudimentary pyramidal horn, scarcely one-fourth as 

 long ; and with small circular regular pores. Thorax with larger irregular pores, and three vaulted 

 bosoms between the three decurrent ribs, which are prolonged into three very long and slender 

 prismatic feet, S-shaped, curved, and twice to three times as long as the shell. 



Dimensions. — Cephalis 0'02 long, 0'04 broad ; thorax 0'09 long, 013 broad. 



Habitat. — South Pacific, Station 300, depth 1375 fathoms. 



9. Dictyoiihimus gracilipes, Bailey. 



Didijophimus gracilipes, Bailey, 1856, Amer. Journ. Sci. and Arts, vol. xxii. p. 4, pi. i. fig. 8. 



Shell three-sided pyramidal, with a deep collar stricture. Eelative length of the two joints = 

 1 : 3, breadth = 1:4. Cephalis hemispherical, with a thin horn of the same length. Thorax with 

 three curved ribs, which are prolonged into three divergent angular feet of the same length. Pores 

 irregular roundish. 



Dimensions. — Cephalis 002 long, 0-03 broad ; thorax O'OS long, 0-08 broad. 



Habitat. — North Pacific, Station 240, surface, Kamtschatka (Bailey). 



10. Dictyo2)himns cortina, n. sp. (PL 61, fig. 1). 



Shell three-sided pyramidal, with distinct collar stricture. Eelative length of the two joints 

 = 1:3, breadth =1:4. Cephalis subspherical, with a pyramidal horn of half the length. Thorax 



