REPORT ON THE RADIOLARIA. 523 



Subgenus 1. Amphicraspedon, Haeckel. 



Definition. Both arms of equal size and form, without terminal spines of the 

 branches. 



1. Amphicraspedum maclaganium, n. sp. (PL 45, fig. 11). 



Both arms equal, in the proximal half simple, in the distal- half forked, with six to seven 

 transverse septa ; distal end of each branch rounded, blunt, somewhat broader than the base of the 

 whole arm. Divergent axes of both branches concavely curved. Patagium incomplete, with 

 elliptical perimeter, enveloping only the middle part of the shell. I call this interesting species in 

 honour of Miss Nellie Maclagan, the learned translator of several zoological papers from German 

 into English. 



Dimensions. Radius of each arm 0'25, basal breadth O07 ; distal breadth of each branch 0'08 ; 

 equatorial breadth of the patagium 0'25. 



Habitat. North Atlantic, off Halifax, Station 50, surface. 



Subgenus 2. Amphicraspedina, Haeckel. 



Definition. Both arms of different size or form, without terminal spines on the 

 branches. 



2. Amphicras^yedum wyvilleanum, n. sp. (PI. 45, fig. 12). 



Both arms different. Larger arm simple, egg-shaped, with eleven convex joints, one and a 

 half times as long as broad ; smaller arm in the basal half simple, triangular, with six cap-like 

 joints, in the distal half forked ; both branches egg-shaped, with five joints and blunt ends. 

 Patagium nearly complete, with four to five concave chamber-rows. Called in honour of Sir 

 C. Wyville Thomson. 



Dimensions. Eadius of the larger simple arm 0'18, breadth 0'08 ; radius of the smaller forked 

 arm 0'16 ; breadth of the branches O'Oa ; transverse breadth of the patagium .0'2. 



Habitat. South Atlantic, Station 333, surface. 



Subgenus 3. Amphicraspedula, Haeckel. 



Definition. Both arms of different size or form, with terminal spines of the 

 branches. 



3. Amphicraspedum murrayanum, n. sp. (PI. 44, fig. 10). 



Amplnjmenium murrayanum, Haeckel, 1879, MS. et Atlas (pi. xliv. fig. 10). 



Both arms different in size ; the larger one and a half times as long and broad as the smaller. 

 Both arms triangular, forked at the broader distal end, with two very strong, conical, divergent, 



