PLATE II. 

 " HYMEDESMIA PILATA, Bowerkank. 



Fig. 1. Represents a small portion of the sponge 

 exhibiting the nodes of the disposition of the skeleton 

 and other spicula of which it is composed. X 264 

 linear. 



Fiof. 2. One of the contort, bihamate, retentive 



O ' t 3 



spicula of the dermal membrane. X 420 linear. 



Fig. 3. One of the attenuato-acuate, basally spined, 

 skeleton spicula. X 264 linear. 



Fig. 4. An attenuato-acuate, entirely spined, inter- 

 nal defensive spiculum. X 308 linear." 



" HYMEDESMIA PULCHELLA, Bowerbanh. 



Fig. 5. A small portion of the type-specimen ex- 

 hibiting the loosely formed and irregularly disposed 

 fasciculi of the skeleton structures. X 264 linear. 



Fig. 6. One of the slender, attenuato-acuate, ske- 

 leton spicula. X 420 linear. 



Fig. 7. A long and slender, attenuato-acuate, ba- 

 sally spinous, skeleton spiculum. X 420 linear. 



Fig. 8. One of the angulated, bidentate, equi-ancho- 

 rate, retentive spicula. X 420 linear. 



Figures of the natural size of both the above- 

 described sponges are omitted, as they would not have 

 assisted in the slightest degree in the discrimination 

 of the species." 



