REPORT ON THE RADIOLARIA. 1759 



Genus 739. Ccelagahna,^ n. gen. 



Definition. — C oe 1 ograp li id a with an odd sagittal frcuulum uu each galea and 

 an outer lattice -mantle, armed with sixteen styles (two odd and six paired styles on 

 each valve). 



The genus Ccelagcdma represents the highest degree of development among the 

 Coelographida, and exhibits the maximum number of coronal styles in this family, viz., 

 sixteen (eight on each valve). Two of these arc odd (as in Ccelvspathis and Ccelostylus), 

 viz., the longitudinal anterior nasal style, and the horizontal sagittal style. The six 

 others are paired (as in Cceloplegma), viz., two anterior or pectoral, two lateral or 

 frontal, and two posterior or tergal styles. Since Ccclagalma in this highest developed 

 armature exceeds all the other Coeloplegmida, and exhibits at the same time the 

 utmost complexity in structural detail, it may be regarded as one of the most perfect 

 forms not among the Ph.eodaria only, but among all Radiolaria. 



1. Ccelagalma mirabile, u. sp. (PI 126, figs. 4a, 46). 



Shell-mantle one and a half times as long as broad, its frontal perimeter (fig. 4a) heptagonal, 

 with seven concave sides, its sagittal perimeter octagonal, its equatorial perimeter hexagonal (fig. 4i), 

 the corners of the polygons are marked by the sixteen prominent styles. Nasal odd style longer; 

 and sagittal odd style shorter, than the six paired styles of each valve ; the two pectoral styles 

 are directed forwards, the two lateral styles are nearly opposed in the horizontal frontal diameter, 

 while the two shorter tergal styles are directed backwards. The terminal coronets (at the distal 

 ends of the sixteen styles) are four times forked, with sixteen equal spinulate fingers, each finger 

 at the distal end with eight recurved teeth. The entire surface of the bivalved latticed mantle is 

 densely studded with hundreds of most elegant anchor-pencils, so that the external appearance of 

 this beautiful species becomes one of the most wonderful among Eadiolaria. 



Dimensions. — Length of the shell 5'4, breadth 3'6. 



Habitat. — Central area of the Pacific, Station 271, depth 2425 fathoms. 



1 CmlagalriM = Hollow ornament ; r.a'i'ho:, oLyttK^a,. 



