CLASSIFIED LIST. 13 



Siib-section D. Dermal membrane spiculous, spicula reticulated. 

 Primary skeleton fibres multispiculous. 



60. Isodictya collina. 



Section ***. Spicula of skeleton acuate, more or less spinous. 

 Sub-section A. Primary lines of the skeleton bi- or trispiculous. 



61. Isodictya Beanii. 



62. Normani. 



63. coriacea. 



64. Isodictya funalis. 



65. ,, Hyndmani. 



Sub-section B. Primary lines of the skeleton multispiculous. 



66. laodictya lurida. 



67. fimbriata. 



68. ,, tumulosa. 



69. rugosa. 



70. Isodictya implicita. 



71. insequalis. 



72. deformis. 



Genus XXIII. RAPHIODESMA. 

 Section **. Skeleton spicula acuate. 



1. Raphiodesma floreum. 



2. lingua. 



3. simplicissimum. 



4. Raphiodesma sordidum. 



5. fallaciosum. 



6. intermedium. 



Genus XXIV. SPONGILLA. 



Section *. Skeleton spicula acerate. Spicula of ovaria birotulate. 

 1. Spongilla fluviatilis. | 2. Spongilla Parfitti. 



Section **. Skeleton spicula acerate. Ovai'ia spiculous : spicula 



not birotulate. 



3. Spongilla lacustris. | 4. Spongilla sceptrifera P 



Genus XXV. DESIUACIDON. 



Section *. Skeleton spicula acerate. 

 1. Desmacidon fruticosus. | 2. Desmacidon JefFreysii. 



Section **. Skeleton spicula acuate. 



3. Desmacidon Peachii. 



4. constrictus. 



5. Desmacidon incognitus. 



6. pannosus. 



