1620 



THE VOYAGE OF H.M.S. CHALLENGER. 



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

 -and Orosphserida, and agree in their strong development with that of the Aulacanthicla. 

 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 exhibit the same intimate structure already 

 accurately described by R. 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 phseodium has usually about the same volume (PL 109, fig. 1), but seems 

 to be in many Aulosphserida less developed than in the other PH^EODAEIA. 



I. Subfamily 



Aularida. 



Meshes of the net- 

 work triangular, 

 regular or sub- 

 regular. Six 

 tangential tubes 

 united at each 

 nodal point of the 

 net. 



II. Subfamily 



Aulonida. 



Meshes of the net- 

 work polygonal, 

 usually irregular. 

 Three or four 

 (rarely more) tan- 

 gential tubes 

 united at each 

 nodal point. 



Synopsis of the Genera of Aulosphcerida. 



Without radial tubes, 



Shell spherical, with a simple j 

 network. 



Shell spherical, with pyra- 

 midal elevations or with 

 spongy framework. 



Shell not spherical, either 

 lenticular orspindle-shaped, 

 with simple network. 





Shell spherical, with a spongy 

 framework. 



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 which bears radial 

 tubes, .... 



(" Shell lenticular, with shortened 

 main axis and radial tubes, 



indle . sh d with 



r ' r 



longed mam axis and radial 

 tubes, .... 



Without radial tubes, 



682. Aularia. 



683. Aulosphcera. 



684. Auloscena. 



685. Auloplegma. 



686. AulopJiacus. 



687. Aulatradus. 



688. Aulonia. 



With radial tubes in the nodes of 



the net, . . . 689. Aulastrum. 



Aulodid 



-^ ^.^ tub 



Subfamily 1. AULARIDA, Haeckel. 



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

 six tangential tubes being united at each nodal point. 



