]2 



BRITISH SPONGIADiE. 



Suh-seBtion P. — Dermal membrane spiculo-reticulated. Skeleton : 

 primary lines muUispiculous. 



26. Isodictya pallida. 



27. „ simulans. 



28. „ Ingalli. 



29. Isodictya incerta. 



30. „ crassa. 



Sub-section G.—Spieula of dermis dispersed. Skeleton: primary fibres 

 bi- or trispiculous. 



31. Isodictya Bowerbanki 



I. simulo). 



32. „ filamenta. 



33. Isodictya paupercula. 



34. „ clava. 



Suh-seeiion H. — Spicula of dermis dispersed. Skeleton : primary lines 

 multispiculous. 



35. Isodictya jugosa. 



36. „ palmata. 



37. Isodictya trunca. 



Section **. — Spicula of the skeleton acuate. 



Sub-section A. — Dermal membrane aspiculous. Skeleton : primary 

 fibres multispiculous, smooth. 



38. Isodictya infundibuliformis. 



39. „ dissimilis. 



40. Isodictya gracilis. 



41. ,, invalida. 



Sub-section B. — Dermal membrane spicula dispersed. Primary skeleton 

 fibres with few smooth spicula. 



42. Isodictya Normani. 



43. „ coriacea (some of the acuates incipiently spinous). 



44. „ hispida. 



Sub-section C. — Dermal membrane spiculous, spicula dispersed. 

 Primary skeleton fibres multispiculous. 



