REPORT ON THE RADIOLARIA. 1621 



Genus 682. Aularia,^ n. gen. 



Definition. — A u 1 o s p li -m r i d a with triangular meshes in the network, the 

 tangential tubes of which form a simple smooth lattice-sphere. No radial tubes at the 

 nodal points. 



The genus Aularia is the simplest form of the subfamily ^Vularida, or of those 

 Aulosphasrida in which the network of the shell is composed of regular or subregular 

 triangular meshes ; they are the main group of the family, much more common and far 

 richer in distinct forms than the Aulonida (or the Aulosphserida with polygonal 

 meshes). The shell of Aularia, the probable ancestral form of the family, is a simple 

 lattice-sphere with smooth surface, and diflFers from the common Aulosphcera in the 

 absence of radial tubes, arising at the nodal points. 



1. Aularia ternaria, n. sp. (PI. Ill, fig. 2). 



Tangential tubes of the network cylindrical, straight, smooth, of equal breadth. Triangular 

 meshes of the reticular sphere very regular, equilateral triangular. This species is the simplest of 

 all Aulosphserida and similar to the common Aulosphcera trif/onojja, but has no radial tubes. 



Bimemions. — Diameter of the sphere I'O to 2-0 ; tubes 01 to 015 long, 0-007 to O'Ol broad. 



Habitat. — Central Pacific, Stations 270 to 274, surface. 



2. Aularia tuhularia, n. sp. 



Tangential tubes of the network cylindrical, straight, of equal breadth, thorny, covered with 

 numerous short bristle-shaped thorns, which are all of the same length and perpendicular to 

 the tube. 



Dimensions. — Diameter of the sphere 30 ; tubes 015 long, 0'005 broad. 



Habitat. — South Pacific, Station 291, depth 2250 fathoms. 



3. Aularia trigonaria, n. sp. 



Tangential tubes of the network smooth, very thin in the middle part, gradually dilated 

 towards both ends, so that the nodal points of the network are inflated. (Similar to Aulospha:ra 

 sceptrophora, PI. 109, fig. 3, but without radial tubes.) 



Dimcjisions. — Diameter of the sphere 2-2; tubes 01 long, 0-002 broad in the middle part, 

 Q-Ol on both sides. 



Habitat. — North Pacific, Station 253, depth 3125 fathoms. 



' .4 uZan'a = Tubular shell ; xi/hi^ia. 



