REPORT ON THE RADIOLARIA. 1215 



the length, bearing three divergent lateral branches, which are directed upwards, and correspond 

 to the three thoracic ribs. Further down, near the collar stricture, a short divergent frontal 

 horn arises. Thorax with irregular roundish pores of different sizes, three to six times as broad as 

 the bars. Peristome with a simple coronal of short, conical, divergent spines, about as long as the 

 diameter of the cephalis. 



Dimensions. Cephalis 0'02 long, OD4 broad ; thorax O06 long, 0'2 broad. 



Habitat. North Atlantic, Canary Islands, surface. 



3. Lampromitra furcata, n. sp. (PI. 58, fig. 8). 



Shell flat, conical, with deep collar stricture, very similar in form and structure to the preced- 

 ing species ; differs from it in the shape of the peristome and the armature of the cephalis, which 

 bears a conical, forked, occipital horn of the same length, and a small rudimentary divergent frontal 

 horn. Length of the two joints = 1:2, breadth =1:6. The four pores of the collar septum (two 

 larger cardinal and two smaller jugular) exhibit in this species a peculiar asymmetry (fig. 8). The 

 peristome bears a simple coronal of spines as long as the diameter of the cephalis. The major part 

 of them is forked, some irregularly branched. 



Dimensions. Cephalis O02 long, 0'03 broad; thorax 0'06 long, 018 broad. 



Habitat. South Pacific, Station 298, depth 2225 fathoms. 



4. Lampromitra pyramidalis, n. sp. 



Shell flat, pyramidal, smooth, with slight collar stricture. Length of the two joints = 1:4, 

 breadth = 1:9. Cephalis subspherical, with an oblique pyramidal horn of twice the length, and 

 small circular pores. Thorax with three strong, divergent, straight ribs and three flat triangular 

 sides between them, with subregular hexagonal pores, increasing in size towards the mouth. 

 Peristome with a simple coronal of large and numerous divergent, conical spines, half as long as the 

 shell. 



Dimensions. Cephalis O02 long, 0'02 broad ; thorax 0'09 long, 018 broad. 



Habitat. South Atlantic, Station 325, depth 2650 fathoms. 



5. Lampromitra huxleyi, Haeckel (PI. 59, fig. 1). 



Eucecryplialus huxleyi, Haeckol, 1879, Natiirl. Schopfungsgesch., Edit. vii. Taf. xvi. fig. 9. 



Shell flat, conical, spiny, with slight collar stricture. Length of the two joints = 1:3, breadth 

 = 1:8. Cephalis hemispherical, with a short conical horn of the same length. Thorax with 

 irregular polygonal pores. Peristome with three coronals of divergent bristle-shaped spines ; the 

 first directed obliquely upwards, the second outwards, and the third nearly vertically, downwards ; 

 the bristles of the latter are much longer, about as long as the height of the shell. 



Dimensions. Cephalis 0'02 long, - 02 broad; thorax OD6 long, 016 broad. 



Habitat. Australia (east coast), Station 169, surface. 



