234 AETHUR DENDY. 



with a Syconoid type of canal system, is scarcely a character 

 of generic importance, and I have therefore reduced the 

 species to the rank of a sub-genus. 



Genus 7. — U tell a, Dendy (4). 



Diagnosis. — Flagellated chambers elongated, arranged 

 radially around the central gastral cavity. There are no 

 longitudinally arranged oxea in the dermal cortex, but a layer 

 of oxeote spicules, longitudinally arranged, lies beneath and 

 parallel to the gastral surface. The tubar skeleton is articulate. 



Remarks. — This genus was proposed for the reception of 

 Haeckel's remarkable Sycandra hystrix (5), and Schmidt's 

 Ute utriculus (19) may perhaps also be included in it. 

 The genus is obviously a special modification of the 

 Grantia type. It is, as I have already pointed out, very 

 unusual to find oxeote spicules in the gastral cortex of any 

 calcisponge. 



Genus 8. — Anamixilla, Polejaeff (8). 



Diagnosis. — Flagellated chambers elongated and radially 

 arranged. There is no special tubar skeleton, the skeleton 

 of the chamber layer consisting of large radiate spicules, 

 arranged without regard to the direction of the chambers, 

 and of the outwardly directed basal rays of the subgastral 

 sagittal triradiates. 



Remarks. — The derivation of this remarkable genus from 

 the Grantia type is still indicated by the presence of the 

 subgastral sagittal triradiates. It may be compared to a 

 Grantia in which the ordinary articulate tubar skeleton has 

 been almost entirely replaced by the invasion of large tri- 

 radiates from the dermal cortex. The only species as yet 

 known is the Australian Anamixilla torresi, Polejaeff 

 (8), to the account of which given by Polejaeff I have nothing 

 to add. I have, however, ventured to slightly alter the original 

 diagnosis. 



Genus 9. — Sycyssa, Haeckel (6). 



Diagnosis. — The flagellated chambers are elongated and 



