762 PROF. A. BENDY AND MR. R. W. H. ROW ON 



wall, whose convoluted edge represents the oscular margin. 

 Canal system syconoid. Tubar skeleton articulate. Withoiit 

 colossal longitudinal oxea. 



For illustrations of this genus see Dendy [1891 B]. 



We propose this genus for the reception of the remarkable 

 species T. labyrinthica, usually l-cnown as Grantia lahyrinthica, 

 which forms the subject of a special memoir by one of us, Dendy 

 [1891 B]. We now consider that the very peculiar external form 

 is of sufficient importance to justify generic separation. The 

 species w^as originally placed by Carter in his genus Teichonella, 

 on account of some superficial resemblance to his T. prolifera ; 

 but although the name Teichonella has now been universally 

 abandoned even for Leucetta (Teichonella) jyrolifera, we do not 

 consider ourselves justified in reviving it for Grantia lahyrinthica, 

 for Mr. Carter himself subsequently dissociated this species from 

 Teichonella and placed it in the genus Grantia [1885-1886]. 



The only known species is : — 



1. T. LABYRiNTHicA Garter. 



Teichonella lahyrinthica Carter [1878]. 

 Grantia lahyrinthica Dendy [1891 B]. 



Genus 25. Grantiopsis Dendy [1892 B]. 



Diagnosis. Canal system syconoid. Deimal cortex as thick as 

 the chamber layei^, with many layers of tangential triradiates. 

 Tubar skeleton articulate, the proximal joint being composed 

 of subgastral sagittal quadriradiates (? or triradiates), the 

 other joints of sagittal triradiates practically reduced to 

 the basal ray by suppression of the paired rays. Without 

 colossal longitudinal oxea. 



For illustrations of this genus see Dendy [1893 A] and Row 



[1913 MS.]. 



This genus was first proposed by Dendy [1892 B] for his 

 Grantiopsis cylindrica, and was considered by him to be a sub- 

 genus of Grantia. Jeiakin [1908 B] placed it as a distinct genus 

 in his family Staurorihaphidse, on the ground that the subgastral 

 spicules were " chiactines." As we cannot accept the chiact 

 theory, we again transfer the genus to the Giuntiidae, but 

 consider it sufficiently distinct from Grantia to deserve generic 

 recognition. 



We have recently discovered, as the result of our study of 

 Mr. Carter's MS. illustrations, in the possession of one of us, 

 that that author's " Hypograntia infreqimns (incertee sedis) " is 

 undoubtedly a species of Grantiopsis, a,nd the same species has 

 recently tui-ned up again in the collection made by the Hamburg 



