BRITISH SPONGES. 19 
6. Small mass, washed. Devonshire. Presented by G. 
Johnston, M.D. 
c, d& e. Mass, washed. Presented by G. Johnston, M.D. 
Jf. Rounded mass with dry mucus. Presented by G. John- 
ston, M.D. 
3. SPONGIA ? levigata. 
Spongia levigata, Montagu in Wern. Mem. ii. 95. pl. 16. fig. 4; 
Flem. Brit. Anim. 526 ; Johnst. Brit. Sp. pp. 170, 250. 
Seypha levigata, Gray, Brit. Pl. i. 358. 
Inhab. 2 
Dubia? 
? Spongia prolifera, Grant, Edinb. Phil. Journ. xiv. 116 (not So- 
lander and Ellis); not described. 
Inhab. 2 
7. DYSIDEA. 
Duseideia, Johnston, 1842, p. 185. 
Dysidea, Johnston, 1842, p. 251. 
1. Dysrpea fragilis. 
Spongia fragilis, Montagu in Wern. Mem. iu. 114. pl. 16. figs. 1, 2; 
Gray, Brit. Pl. i. 360; Flem. Brit. Anim. 526; Templeton m 
Mag. Nat. Hist. ix. 471. 
Duseideia fragilis, Johnst. Brit. Sp. p. 187. t. 13. fig. 6, and t. 14. 
fig. 4. 
ipaces fragilis, Johnst. Brit. Sp. 251. 
Halichondria areolata, Johnst. Brit. Sp. 121. t.13. fig. 4, pp. 197 
and 247. 
a, b,c, d. Washed. Presented by G. Johnston, M.D. 
e, f, 9, h, 1, with the mucus preserved to dry. Presented 
by G. Johnston, M.D. 
j, with mucus in spirits. Presented by G. Johnston, M.D. 
k. “ Halichondria areolata.”’ 
1. Spicula of a, m Canada balsam. Prepared by J. S. 
Bowerbank, Esq. 
a. “ Hal. areolata.” Portaferry, Strangford Lough, W. 
Thompson, Esq. Presented by G. Johnston, M.D. 
