78 LIVERPOOL MARINE BIOLOGY COMMITTEE REPORT. 



Plumohalichondria 2>luinosa, C. 



Hymeniacidon plumosa, Bk. = Microciona plumosa, Bk. 

 Halichondria plumosa, J. 



This species, as well as Ophlitaspongia seriata, represents, 

 with a few other species, the British examples of Mr. Carter's 

 order Echinonemata, which embraces all sponges whose fibre 

 is echinated with spicules.* 



L. F. M., No. 32. 3. 73. 2. Collected at Holyhead. 



Ophlitaspongia seriataf Bk. 



Ghalina seriata, Bk. = Halichondria seriata, J. 



This species t is plentiful at Holyhead, surrounding in 

 a layer about a quarter of an inch thick, the stems of 

 Laminar ia. 



L. F. M., No. 25. 9. 73. 12. Collected at Holyhead. 



Order VI.— HOLORHAPH IDOTA. 



Family. — Eenierida. 



Group. — Amorphosa. 



Amorphina panicea, S. 

 Halichondria panicea, J. 



This is a species t without any fibrous skeletal structure, 

 the spicules, which are simple acerate, being dispersed 

 throughout the sponge substance, and loosely congregated 

 together in support of the areolar mass, which, when cut 

 through, has the appearance of a slice of bread (bread- 



* For illustrations of this kind of fibre see figs. 287, 288, 289, 290 and 

 291, pi. xvii, Blon. Brit. Spong., vol. i. For illustration of the fibre of this 

 species, see fig. 13, pi. xxiv, vol. iii. 



t For illustration of the fibre of this species, see fig. 287, pi. xvii, vol. i, 

 Mon. Brit. Spong. For figure of sponge coating a piece of rock, see pi. ixv, 

 vol. iii. 



I For good illustrations of the usual forms of this sponge, see pi. xl, 

 vol. iii, Mon. Brit. Spong. Johnston's Brit. Spong., p. 114, pi. xxxi; 

 Mon. Brit. Spong., vol. i, pi. xix, fig. 300; vol. ii, p. 229; vol. iii, pi. 

 xxxix and xl, 



