EE VISION "BRITISH SPONGIADJE. 



189 



Genus Desmacella, Schmidt. 

 Skeleton fibrous. Megascleres tylostyli or styli, or 

 both. Microscleres sigmata and (or) toxa, occasionally 

 trichodragmata. 



Desmacella cavernula, B., LXXXII. (Top sent, 18, 



p. 84). 

 ,, peachi, B., LXIII. (Topsent, 18, p. 84.) 



„ variantia, B., XXXIII and XLV. 



Genus Biemma, Gray. 

 Sponges allied to Desmacella, but with the aspect and 

 structure of Halicho?idria. Megascleres : tylostyles. 

 Microscleres : sigmata. 



Biemma corrugata, B., XLIII. (Topsent, 18, p. 81.) 



,, inornata, B., XL VII. (Topsent, 18, p. 80.) 



Genus Esperiopsis, Carter. 



External form amorphous or symmetrical. Megascleres 



monactinal. Microscleres isochelse, with or without 



sigmata. 



Esperiopsis alcleri, B., LVL 

 clarkei, B., LVL 

 collina, B., 4, XIV. 

 deformis, B., 4, XIV. 

 dubia, B., XC. 

 edwardi, B., LVIII. (Bidley and Dendy, 



14, p. 78.) 

 foliata, B., LXXIIL (Carter, 1, p. 310.) 

 fucorum, Johnst., LVL 

 funalis, B., 4, XV. 

 gracilis, B., LVIII. 

 hispida, B., 4, XII. 

 imitata, B., LXXVI. 

 mutula, B., LXXIV. 

 normani, B., LVL 

 pauper a, B., LV. 



