244 ARTHUR DENDY. 



mind, those species which happen to have oxeote spicules as a 

 distinct genus, to which he gives the name Ebnerella. 



As examples of the genus Amphoriscus as maintained by 

 me, I may cite all Haeckel's species of Sy cilia (5) and Pole- 

 jaeff's Amphoriscus elongatus (8). 



Genus 18. — Syculmis (Haeckel [5], emend.). 



Diagnosis. — The flagellated chambers are elongated, and 

 arranged radially around the central gastral cavity. The 

 skeleton of the chamber layer is composed of the apical rays 

 of subdermal and subgastral quadriradiates. There is a root- 

 tuft of oxea and anchoring quadriradiates. 



Remarks. — Haeckel's diagnosis (5) of the genus was based 

 entirely upon the spiculation, without regard to the arrange- 

 ment of the skeleton. As it happened, however, he only knew 

 one species — the remarkable Syculmis synapta — which 

 possesses only quadriradiate and oxeote spicules; and there- 

 fore, although it is necessary to alter the generic diagnosis, it 

 is not necessary to make any change in the extent of the genus. 

 Syculmis synapta (5) is evidently only a very special modi- 

 fication of the Amphoriscus type. 



Genus 19. — Leucilla (Haeckel [5], emend.), 

 figs. 21, 22. 



Diagnosis. — Flagellated chambers spherical or sac-shaped, 

 never truly radial. 



Remarks. — This genus occupies a position amongst the 

 Amphoriscidse, analogous to that occupied by Leucandra 

 amongst the Grantidse, and Vosmaeropsis amongst the 

 Heteropidae, being distinguished by the Leuconoid (or Syl- 

 leibid) character of the canal system. Leucilla uter, as I 

 have already pointed out, affords an excellent example of the 

 Sylleibid type (fig. 21), while in Leucilla australiensis 

 (fig. 22) we meet with a more typically Leuconoid modification. 

 Even in Leucilla australiensis, however, we often find the 

 flagellated chambers more or less elongated, thus showing how 



