9,^. 



PLATE XXXV^III. 



HvjMENIacidon DujArvDiNii, Bowcrbaid. 



Vol. ii, p. 224, ' Mon. Brit. Spongiadaj.' 



Fig. 1. — Represents the specimen found about two 

 miles nortli of Scarborough. Natural size. The dark 

 front surface represents the sponge ; the ujiper white 

 surface is NuUi'pora pohjmorplba. 



Fig. 2. — One of the skeleton spicula. X 250 

 linear. 



Fig. 3. — One of the internal defensive spicula. 

 X 250 linear. 



Fig. 4. — A valve of Peden varius, the greater 

 portion of which is covered with E. Dujanlinii. From 

 Tenby. Natural zize. 



Hymesiacidon celata, Bowevhanlc. 



Vol. ii, p. 212, ' Mon. Brit. Spongiadaa.' 



Fig. 5. — Represents a small boulder of limestone 

 from Tenby, with innumerable perforations, each of 

 which is occupied by H. celata. Natural size. 



Fig. 6. — An average-sized skeleton spiculum. X 350 

 linear. 



Halichondeia GELATiNOSA, Bowerhauh. 



Vol. ii, p. 222, ' Mon. Brit. Spongiada3.' 



Fig. 7. — Represents the typo-specimen from Dourie 

 Voe, Shetland. Natural size. 



Fig. 8. — A full-sized spinulate skeleton spiculum. 

 X 123 hnear. 



Htheniacidon BucKLANiir? Boivcrbanh. 



Vol. ii, p. 226, ' Mon. Brit. Spongiad;e.' 



Yiyr. O.. Represents the specimen from the rucks of 



