EEPOET ON THE RADIOLARIA. 1401 



* 



dilated into a very wide mouth. Pores small, of nearly equal size and similar form, of the same 

 breadth as the bars. 



Dimensions. Length of the three joints, a O03, b O'OG, c 0'09 ; breadth, a 003, b 0'06, c 012. 



Habitat. Cosmopolitan ; Atlantic, Pacific ; many stations, at different depths. 



Subgenus 2. Theocorbis, Haeckel. 



Definition. Pores of the thorax and of the abdomen of different sizes or dissimilar 

 forms. 



6. Theoconus jovis, n. sp. (PL 69, fig. 4). 



Shell bell-shaped, nearly conical Length of the three joints = 5 : 6 : 7, breadth = 4 : 10: 14. 

 Cephalis nearly cylindrical, large, little curved, with a very large, oblique, pyramidal horn, as long 

 as the two first joints together. Thorax and the broader abdomen irregularly bell-shaped, dilated 

 towards the wide mouth. Pores circular, somewhat irregularly disposed, gradually increasing in size 

 towards the mouth. 



Dimensions. Length of the three joints, a - 05, b 0'06, c 0'07 ; breadth, a 0'04, b 01, c 014. 



Habitat. Central Pacific, Station 272, depth 2600 fathoms. 



7. Theoconus junonis, n. sp, (PL 69, fig. 7). 



Shell nearly conical. Length of the three joints = 4 : 5 : 8, breadth = 3 : 8 : 11. Cephalis ovate, 

 with a large apical opening at the base of the vertical compressed horn, which has about the same 

 length. Thorax and the broader abdomen together conical, gradually dilated towards the wide 

 mouth. Thorax with a bosom-like protuberance on one side. Pores circular, gradually increasing 

 in size. 



Dimensions. Length of the three joints, a 0'04, b 0'05, c 0'08 ; breadth, a 0'03, b Q'08, c Oil. 



Habitat. North Pacific, Station 244, depth 2900 fathoms. 



8. Theoconus longicornis, n. sp. 



Shell conical, thorny. Length of the three joints = 1:2:4, breadth =1:3:6. Cephalis 

 nearly spherical, with a very large, cylindrical, perpendicular, straight horn, once and a half to 

 twice as long as the whole shell. Thorax conical. Abdomen nearly hemispherical, with wide open 

 mouth. Pores circular, four to six times as broad in the thick-walled spiny abdomen as in the 

 thin-walled rough thorax. 



Dimensions.- Length of the three joints, a 0'03, b 0'06, c 012 ; breadth, a 0'03, b 0'09, c 018. 



Habitat. -Tropical Atlantic, Station 347, depth 2250 fathoms ; also fossil in Barbados. 



(ZOOL. CHALL. BXP. PART XL. 1886.) Jfr 176 



