CLASSIFIED LIST. 13 



Sub-section D. — Dermal membrane spiculous, spicula reticulated. 

 Primary skeleton fibres multispiculous. 



60. Isodictya colUna. 



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



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



64. Isodictya funalis. 



61. Isodictya Beanii. 



62. ,,' Normani. 



65. „ Hyndmani. 



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



66. Isodictya lurida. 



67. „ fimbriata. 



68. „ tumulosa. 



69. „ rugosa. 



70. Isodictya implicita. 



71. „ insBqualis. 



72. „ deformis. 



Genus XXIII.— Raphiodesma. 



Section **. — Skeleton spicula acuate 



1. Raphiodesma floreum. 



2. „ lingua. 



3. „ simplicissimnm. 



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. Ovaria spiculous : spicula 

 not birotulate. 



3. Spongilla lacustris. | 4. Spongilla sceptrifera P 



Genus XXV. — Dbsmacidon. 

 Section *. — Skeleton spicula acerate. 

 1. Desmacidon frufcicosus. | 2. Desmacidon Jeflfreysii. 



Section **. — Skeleton spicula acuate. 



3. Desmacidon Peachii. 

 4_ „ constrictus. 



5. Desmacidon incognitus. 



6. „ pannosus. 



