BRITISH SPONGES. 
19 
b. Small mass, washed. Devonshire. Presented by G. 
Johnston, M.D. 
c, d & e. Mass, washed. Presented by G. Johnston, M.D. 
f. Hounded mass with dry mucus. Presented by G. John- 
ston, M.D. 
3. Spongia? laevigata. 
Spongia laevigata, Montagu in Wern. Mem. ii. 95. pi. 16. fig*. 4 ; 
Flem. Brit. Anim. 526 ; Johnst. Brit. Sp. pp. 170, 250. 
Soypha laevigata. Gray , Brit. PI. i. 358. 
Inhab. ? 
Dubia ? 
? Spongia prolifera. Grant , Edinb. Phil. Jour n.xiv. 116 (not So - 
lander and Ellis)-, not described. 
Inhab. ? 
7. Dysidea. 
Duseideia, Johnston , 1842, p. 185. 
Dysidea, Johnston, 1842, p. 251. 
Y 1. Dysidea fragilis. 
Spongia fragilis, Montagu in Wern. Mem. ii. 114. pi. 16. figs. 1,2; 
Gray, Brit. PI. i. 360 ; Flem. Brit. Anim. 526 ; Templeton in 
Mag. Nat. Hist. ix. 471. 
Duseideia fragilis, Johnst. Brit. Sp. p. 187- t. 13. fig. 6, and 1. 14. 
fi g- 4 - . . 
Dysidea fragilis, Johnst. Brit. Sp. 25 1. 
Halichondria areolata, Johnst. Brit. Sp. 121. 1. 13. fig. 4, pp. 197 
and 247. 
a,b,c,d. Washed. Presented by G. Johnston, M.D. 
e, f, g, h, i, 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.” 
l. Spicula of a, in Canada balsam. Prepared by J. S. 
Bowerbank, Esq. 
a. “ Hal. areolata.” Portaferry, Strangford Lough, W. 
Thompson, Esq. Presented by G. Johnston, M.D. 
