980 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus 420. Podocoronis,^ Haeckel, 1881, Prodromus, p. 445. 



Definition. — C o r o n i d a with six large gates (four lateral and two basal). 

 Skeleton composed of two complete rings (the sagittal and basal) and one incomplete 

 (frontal) ring. Basal ring provided with typical, regularly disposed, descending feet 

 (cortinar feet). 



The genus Podocoronis difiers from the two preceding nearly allied genera in the 

 development of typical radial feet on the basal ring, which by their regular disposition 

 and their general ajapearance among the Spyroidea and Cyrtoidea obtain 

 great morphological importance. According to the different number and disposition of 

 these basal feet (or " cortinar feet "), the following subgenera may be distinguished 

 (regarded in my Prodromus, 1881, p. 445, as separate genera) : — Dipocoronis with 

 two lateral feet, Tripocor-onis with three cortinar feet (most important !), Tetracoronis 

 with four crossed feet, Hexacoronis with six radial feet, Stylocoronis with numerous 

 (8 or more feet). These subgenera have important relations to the corresponding genera 

 of Zygospyrida. 



Subgenus 1. Dipocoronis, Haeckel, 1881, Prodromus, p. 445. 



Definition. — Basal ring •with two descending lateral feet (right and left) as pro- 

 longations of the frontal ring. 



1. Podocoronis dipodiscus, n. sp. 



Basal ring nearly circular, with two conical, straight, parallel descending feet, which are direct 

 lateral prolongations of the subcircular fi-ontal ring, and half as long as it. The ovate sagittal rino- 

 bears at the apex a short conical vertical horn. All rings nearly smooth. 



Dimensions. — Height of the frontal ring 0'12, breadth 0'14. 



Habitat. — Central Pacific, Station 266, depth 2750 fathoms. 



2. Podocoronis toxarium, n. sp. (PI. 83, fig. 7). 



Basal ring elliptical, with two descending, slightly curved conical feet, lateral prolongations of 

 the subcircular frontal ring. The ovate sagittal ring bears at the apex a cyLindrical vertical horn, 

 which is connected by two descending lateral arches (or galear arches) with the uppermost part of 

 the frontal ring. 



Dinicnsions. — Height of the frontal ring Ol, breadth 013. 



Habitat. — Central Pacific, Stations 265 to 268, depth 2900 fathoms. 



' Podocoronis != Crown with feet; tov;, xojan';. 



