8 BRITISH SPONGES. 
Halispongia ventilabra, Blainv. Actin. 533. 
Spongia Zetlandica, Jameson in Wern. Mem. 1. 561. 
Spongia xerampelina, Grant in Edin. Phil. Journ. xiv. 116. 
Ling Hoods, Zetlanders. 
a. Brit. Sp.t. 7. Presented by G. Johnston, M.D. 
b. Spicula of a, in Canada balsam. Prepared by J.S. Bower- 
bank, Esq. ~ 
Var. 8. Johnst. Brit. Sp. 107. 
Spongia Scypha, Montagu in Wern. Mem. u. 107, pl. 15. fig. 1. 
Sp. foliascens, Gray, Brit. Pl. 1. 359. 
c. HALICHONDRIA. 
12. HALICHONDRIA simulans. 
Halichondria simulans, Johnston, Brit. Sp. p. 109. t.8, p. 206. 
Var. a. Erect, irregularly branched (Brit. Sp. figs. 1, 2). 
Var. B. Creeping, ramose or nodulous (fig. 3). 
Halispongia reptans, Scouler MS. 
Var. y. Papillary (Brit. Sp. fig. 4). 
Var. 6. Massive (Brit. Sp. fig. 5). 
a. Branched. Dubhn, Dr. Scouler. Presented by G. John- 
ston, M.D. 
b. Branched, Brit. Sp. t.8.f.1. Dr. Scouier. Presented 
by G. Johnston, M.D. 
c. Branched, Brit. Sp. t.8. f.2. Dr. Scouler. Presented 
by G. Johnston, M.D. 
d. Branched. Dr. Scouler. Presented by G. Johnston, M.D. 
e. Clavate, Brit. Sp. t.8.f.1. Dr. Scouler. Presented by 
G. Johnston, M.D. 
f. Tuberose, Brit. Sp. t. 8.f.1. Dr. Scouler. Presented by 
G. Johnston, M.D. 
g. Spicula of a,in Canada balsam. Prepared by J.S. Bower- 
bank, Esq. 
13. HALICHONDRIA cinerea. 
Spongia cinerea, Grant in Edin. New Phil. Journ. ii. 204. pl. 2. 
fig. 3 (the spiculum), copied m Blainv. Actinol. pl. 94. fig. 3. 
Halichondria cinerea, Flem. Brit. Anim. 521; Johnston, Br. Sp. 
p- 111. t.4. figs. 4, 5 (spicula, 246). 
Spongia czerulea Risso, L’ Europ. Mérid. v. 373? ; Delle Chiaje, 
Anim. s. Vert. Nap. wi. 113. tav. 37. fig. 11? 
Spongia pulverulenta, Scouler MS. 
a. (Dublin Bay?) Presented by G. Johnston, M.D. 
b.? On a rock, Scarborough, W. Bean. Presented by G. 
Johnston, M.D. 
c. & e.? Presented by G. Johnston, M.D. 
f. Spicula of a, in Canada balsam. Prepared by J. S. 
Bowerbank, Esa. 
