THE PORIFERA. 87 



are very similar to those of S. suberea, but the growth of the 

 sponge is different, and the surface is more hispid.* 

 L. M. B. C, No. 85. 10. Collected at Hilbre Island. 



Hymeniacidon sanguinea, Bk. 

 Halicliondria sanguinea, J. 



This species t Schmidt places in his genus Amorphina, 

 but Mr. Carter places it in the family Suberitida, though 

 the spicules are acuate and not pin-like, with the remark 

 that Bowerbank found on Johnston's type specimen in the 

 the British Museum, No. 47. 9. 7. 19, flesh spicules (which, 

 however, he does not appear to have regarded as belonging 

 to the specimen) like those of Vioa johnstonii, Schmidt, 

 a Suberite. Mr. Carter has placed it in his group Laxa, 

 which also contains Vioa johnstonii. 



L. M. B. C, No. 85. 11. Collected in tidal pools near 

 Port Erin. 



L. F. M., No. 24. 5. 73. 10. Collected at Holyhead and 

 Douglas Bay. V. 



Family.— Pachytragida. 



Pachymatisma johnstonia, Bk. 

 This sponge belongs to a family quite different from any 

 previously considered in these notes. It has a crustular sur- 

 face,! and is embraced in Mr. Carter's family Pachytragida, 

 which also contains the genera Geodia (Lamarck), Tethya 

 (Johnston), and Stelletta (Schmidt). It corresponds with 

 Schmidt's group Corticatse. The pachytragous sponges 

 possess the various forms of four rayed spicules (quadrira- 



* See Johnston's Brit. Spon. ; Mon. Brit. Spong., vol. ii, p. 203 ; vol. iii, 

 pi. xxxvi. 



f Johnston's Brit. Spong., p. 133, pi. xiv, fig. 3 ; Mon. Brit. Spon., 

 vol. i, p. 239, pi. iii, fig. 72 ; vol. ii, p. 168 ; vol. iii, pi. xxxii, fig. 5-8. 



X See Mon. Brit. Spang., vol. i, pi. xxvii, fig. 353; vol. ii, p. 51; vol. 

 iii, pi. viii, figs. 1-7. Annals, 1869, vol. iv, p. 8, pi. ii, figs. 7, etc. 



