EEVISION ''BRITISH SPONGIAD^." 249 



Note. Eidley and Dendy {U, p. 117) include Hali- 

 chondria ■ patter soni, B., under the present genus. 

 This must be an oversight, as that species possesses 

 no bipocilli. Its right place seems to be under 

 Bendoryx. Topsent {18, 34) places J. implicata in 

 his new genus Pocillon. I do not follow him, as 

 Bowerbank leaves it uncertain whether there are 

 really '' defensive spicules " in that sponge. 

 Genus Lissodendoryx, Topsent {18, p. 97.) 

 Sponges having the main skeleton composed of smooth 

 styli, but else with the characters of Dendoryx. 

 Lissodendoryx flahellifera, B., 4, VII. 

 Genus Tedania, Gray. 

 Megascleres of the ectosome diactinal, those of the 

 choanosome monactinal, both smooth. Microscleres 

 raphides. 



Tedania simplicissima, B., LXXIII. 

 Genus Forcepia, Carter. 

 Megascleres of the ectosome diactinal, those of the 

 choanosome monactinal, both smooth. Characteristic 

 microsclere a labis, with or without isochelae or anisochelae. 

 Forcepia forcipis, B., XLIII. 



Genus Yvesia, Topsent {18, p. 102). 

 Megascleres of the ectosome generally monactinal, but 

 often also diactinal, always spined, Megascleres of the 

 choanosome smooth, normally diactinal. Microscleres 

 isochelae and (or) sigmata, or absent altogether. 

 Yvesia armigera, B., 4, IV. 

 ,, alhula, B., XLV. 



c. Sub-family Ectyonin^, Eidley and Dendy. 

 Skeleton fibres echinated, generally by spined spicules. 



Genus Myxilla, Schmidt. 

 Megascleres of the choanosome monactinal, spined, 



