766 PROF. A. BENDY AND MR, R. W. H. ROW ON 



Genus 31. Uteopsis nov. 



Diagnosis. Canal system syconoid. Tubar skeleton reduced to 

 the basal rays of subgastral sagittal radiates, stipplemented 

 distally by radially arranged oxea. Dermal cortex well 

 developed, and containing colossal longitudinal oxea. 



.For illustrations of this genus see Pol6jaefF [1883]. 



We propose this genus for PolejaefF's Ute argentea, which 

 obviously differs widely from the other species of the genus Ute. 

 The replacement of the distal portion of the tubar skeleton 

 by oxea is a very unusual feature, and, from the analogy of 

 Grantiopsis, we think it possible, but not probable, that these 

 oxea are really radiates whose paired rays have been completely 

 lost. It seems more jorobable that they are to be compared to 

 the radial oxea of Aclirwmorpha. 



The "tubar" quadriradiates referred to by Polejaeff presumably 

 belong to the exhalant canals of the chambers, and not to the 

 chambers themselves. 



The only known species of the genus is : — 



1. U. ARGENTEA PoUjaeff. 



Ute argeniea Polejaeff [1883]. 



Genus 32. Anamixilla Polejaeff [1883]. 



Diagnosis. Canal system syconoid. Tubar skeleton reduced to 

 the outwardly directed basal rays of the subgastral sagittal 

 radiates. Skeleton of the chamber layer otherwise con- 

 sisting of large triradiate spicules, ai-ranged without regard 

 to the direction of the chambers. Dermal cortex well 

 developed, but without colossal longitudinal oxea. 



For illustrations of this genus see Polejaeff [1883]. 



As Dendy has previously pointed out [1893 A], this genus may 

 be looked upon as a Gh-antia in which the ordinary tubar skeleton 

 has been almost entirely replaced by the invasion of large tri- 

 radiates from the dermal cortex. Thus the genus is of interest 

 as indicating one method by which the confvised chamber-layer 

 skeleton of Leucandra may have arisen. 



The only known species is : — 



1 . A. TORRESi Polejaeff. 



Anamixilla tori'esi Polejaeff [1883]. 



