362 Mr. H. J. Carter's Contributions to our 



is straight, like the bacillar flesh-spicule of Stelletta, or 

 spiral, like that of Tethea muricata, so have placed it in the 

 group Stellettina as the first approach to the bacillar body 

 afterwards so strongly developed in " Subsection 1, b" ex. gr. 

 Stelfetta bacillifera, var. robusta. But although it is viewed 

 as a species of Stelletta, it cannot be ignored that it is a bor- 

 dering species which brings the Stellettina close to the Thene- 



anina. 



Finally the classification would stand thus : 



Thexeaxina, Crtr. (new group). 

 Char. Microspined spinispirular flesh-spicules 



* 



Gen. 1. Thenea, Gray. 



Char. Pedicellate or rooted. See antea, under Tethea 

 muricata and Wyvillethomsonia Wallichii, for spiculation. 



No. 1. Thenea muricata, Bk. 

 Globoconical in form, with a few large flesh-spicules. 



No. 2. Thenea Wallichii, Wright. 



i 



Agariciform, with a great abundance of large flesh-spicules. 



No. 3. Thenea fenestrate Sdt. {op. et he. cit.)* 



Gen. 2. Ecionemia, Bk. 



Char. Sessile. See atiteh, under u Normania crassa." 



No. 1. Ecionemia compressa, Bk. 



Without trifurcates or anchoring-spicules, but with the 

 addition of a centrally inflated spiniferous acerate. 



No. 2. Ecionemia nana, Crtr. 



With tricurvates and aborted shaft. For spiculation see 



1 Annals,' 1880 (vol. vi. p. 138, pi. vii. fig. 43, &c). The 



other two species that 1 have there mentioned are " pro- 

 visional," 



* In Geodia : the flesh-spicule is essentially the siliceous ball, as above 



defined, m Stelletta a stellate, in Theneanina a spinispirula, and in Tethvina 

 a bi hamate. r r 7 



