1620 



THE VOYAGE OF H.M.S. CHALLENGER. 



a smaller tubule, have in general the same shape as in the closely allied Sagosphserida 

 and Orosphgerida, and agree in their strong development with that of the Aulacanthida. 

 The collection of the Challenger contains numerous well-preserved preparations of 

 Aulosphserida, which were stained by carmine immediately after being captured, and in 

 which the central capsule and its nucleus exliibit the same intimate structure already 

 accurately described by E. Hertwig. The diameter of the capsule is usually between 

 0"2 and 0'3, rarely less than 0"15 or more than 0'35 mm., the nucleus has half that 

 size. The phaeodium has usually about the same volume (PI. 109, fig. 1), l)ut seems 

 to be in many Aulosphairida less developed than in the other Ph^odaeia. 



Synojysis of the Genera of Aulosphcerida. 



1. Subfamily 

 Aularida. 

 Meshes of the net- 

 work triangular. 

 Tegular or sub- 

 regular. Six 

 tangential tubes 

 united at each 

 nodal point of the 

 net. 



IL Subfamily 



AulouiJa. 



Meshes of the net- 

 work polj'gonal, 

 usually irregular. 

 Three or four 

 (rarely more) tan- 

 gential tubes 

 united at each 

 nodal point. 



Shell spherical, with a simple 

 network. 



Shell spherical, with pyra- 

 midal elevations or with \ 

 spongy framework. 



f "Without radial tubes, 



With radial tubes in the nodes of 

 the net, 



Shell covered with pyramidal 

 elevations, the top of which 

 bears a radial tube, 



Shell with spongy framework, the 

 surface of wliich bears radial 

 tubes, .... 



C Shell lenticular, with shortened 



c,, ,, , 1-1 -,1 main axis and radial tubes, 



Shell not spherical, either 



lenticular orspindle-shaped,<| g^^jj spindle-shaped, with pro- 



longed main axis and radial 

 tubes, .... 



with simple network. 



Shell spherical, with a simple 

 network. 



' "Without radial tubes, 



"With radial tubes in the nodes of 

 the net, 



Shell spherical, with a spongy ) ^^r-^^^^^^ ,,ji,i ^^^^ 

 framework. ) ' 



682. Aularia. 



683. Aulospluira. 



684. Auloscena. 



685. Auloplegma. 



686. AnJophacus. 



G87. Aulatradus. 



688. Aulonia. 



689. Aulastrum. 



690. Aulodidyum. 



Subfamily 1. Aulapjda, Haeckel. 



Definition. — Network of the shell with triangular, regular or subregular meshes ; 

 six tangential tubes being united at each nodal point. 



