177 



PLATE LXX. 



OPHLITASPONGIA PAPILLA, Bowerbanlc. 



Vol. ii, p. 378, ' Mon. Brit. Spongiadse.' 



Fig. 1. Represents the type-specimen, in the 

 cabinet of the Rev. A. M. Norman. Natural size. 



Fig. 2. A small piece of the skeleton fibre with its 

 spicula in situ. X 250 linear. 



Fig. 3. One of the fusiformi-acuate tension spicula 

 of the dermal membrane. X 250. 



Fig. 4. A tricurvate, acerate, tension spiculum 

 from the dermal membrane. X 250 linear. 



HALIOHONDRIA FAMNARIA, Bowerbanft. 



Vol. ii, p. 269, ' Mon. Brit. Spongiadse.' 



Fig. 5. Represents a fine specimen of the species 

 from Strangford Lough coating a valve of Pecten oper- 

 cularis. Natural size. 



Fig. 6. One of the slender spinulate spicula of the 

 dermal membrane. X 250 linear. 



Fig. 7. An inflato-cylindrical tension spiculum 

 from the dermal membrane. X 530 linear. 



Fig. 8. A skeleton spiculum. X 250 linear. 



VERONGIA ZETLANDICA, BoiverbauL 



Vol. ii, p. 380, ' Mon. Brit. Spongiadse.' 



Fig. 9. Represents the largest and best developed 

 specimen of the species from Shetland, in the cabinet 

 of the Rev. A. M. Norman. Natural size. 



Fig. 10. A smaller specimen from the same locality. 

 Natural size. 



Fig. 11. A small portion of the fibre exhibiting the 



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