REPORT ON THE RADIOL ARIA. 1219 



1. CJathromitra pterophormis, u. sp. (PI. 57, fig. 8). 



Cephalis very large, hemispherical, about as long and half as broad as the three-sided pyramidal 

 thorax ; both with irregular, polygonal meshes. Apical horn three to four times as long as the frontal 

 horn and the three basal feet. All five spines three-sided prismatic, with nearly smooth edges. 

 Three lateral wings half as broad as the cephalis. 



Dimensions. — Cephalis 0'05 long, 01 broad ; thorax 0'05 long, 0'15 broad. 



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



2. C/athromitra pentacantha, n. sp. 



Cephalis large, hemispherical, half as long as the three-sided pyramidal thorax ; both with irre- 

 gular, roundish meshes. Apical horn of about the same length as tire frontal horn, and twice as 

 long as the three basal feet, All five spines three-sided prismatic, with denticulated edges. Three 

 lateral wings about as broad as the cephalis. 



Dimensions. — Cephalis 0'04 long, 0'08 broad ; thorax O'l long, 0'2 broad. 



Habitat. — Central Pacific, Station 268, depth 2900 fathoms. 



Genus 545. Clathrocorys,^ Haeckel, 1881, Prodromus, p. 432. 



Definition. — Setliopilida (vel Dicyrtida triradiata aperta) with three promiuent 

 lateral ribs on the thorax, alternating with three large holes (or thoracic gates). The 

 three ribs are connected with the central apical horn of the cephalis by three vertical 

 latticed wings. 



The genus Clathrocorys differs from the two preceding nearly allied genera in the 

 incomplete fenestration of the thorax, the three perradial ribs of which are separated by 

 three large interradial holes. It has therefore the same relation to Callimitra that 

 Clathrocanium bears to Dictyophimus. 



1. Clathrocorys murrayi, n. sp. (PI. 64, fig. 8). 



Cephahs pear-shaped, with irregularly square pores. From the centre of its base there arise four 

 strong, prismatic, radial beams of nearly equal size, the vertical, straight, cephalic horn being little 

 longer than the three divergent, somewhat curved feet. In the three meridional planes (between the 

 horn and each foot) a few rather thick branches arise, which by communication of the ramules form 

 the three vertical latticed wings ; eacli wing with two large meshes, three to five meshes of medium size, 

 and three to four parallel arachnoidal rows of small, square, distal meshes. The three walls of the flat 

 pyramidal tliorax (between every two feet) are formed in the upper part by squarish network 



1 (/fofftrocoro/s = Lattice-heliuet ; x>ji6^x, k6^u;. 



