244 My. H. J. Carter’s Contributions to our 
The fact is that Hymentacidon Dwardinit, Bk., although 
well described (No. 6, /. c.) and illustrated (No. 21, pl. xxxviu. 
figs. 1-4), is no Hymendacidon at all, but a Hymedesmia 
according to Dr. Bowerbank’s classificatory diagnoses (No. 6, . 
vol. i. p. 153 &c.) ; for the thin gelatinous film of which it is 
composed supports a bed of spicules (“ tibiella ” with inflated 
ends, not simply cylindrical and obtuse, as figured by Dr. 
Bowerbank, No. 21, /. c.) confusedly arranged ; from the sur- 
face of which project shorter, clavate, spined spicules with an 
inflated end respectively, in an echinating manner (that is, 
with their points outwards), while the whole when dry is 
brittle and not tenacious like the gummy consistence of the 
Carnosa. Thus the character of Hymeniacidon Dwardinii 
more resembles that of the lamina of “ Microciona and Hyme- 
rhaphia”’ (No. 6, vol. i. p. 190), to which Dr. Bowerbank 
himself has especially likened Hymedesmia, than the massive 
forms with crumb-of-bread-like structure in Hymeniacidon. 
Similar remarks might be made on his Hymeniacidon pau- 
pertas, whose description just precedes that of H. Dujardinii ; 
but this isnot the place for them. It is therefore Dr. Bower- 
bank’s and not Dujardin’s “ misapprehension ”’ of the “ struc- 
ture of the genus Halisarca” (No. 6, vol. u. p. 225) that 
alone concerns us for the present as it has done. et us now 
turn our attention to the enumeration and classification of 
the Carnosa as proposed in my ‘‘ Notes” (No. 28, p. 438). 
Class SPONGIDA. 
Order 1. CARNOSA. 
Char. Without evident skeleton *. 
Family 1. Halisarcida. 
Char. Possessing no spicules. 
In 1838 Dujardin discovered on the coast of Normandy 
(Calvados, No. 1, /.¢.), and described, the sponge-substance 
to which he gave the name of “Halisarca;” and in 1849 
Johnston described the same kind of sponge as a British 
species. from Berwick Bay &c. under the designation of 
Halisarca Dujardin’ (No. 2, l. ¢.). To this Schmidt, in 
1862, added another species, viz. Halisarca lobularis (No. 4 
p- 80), which, in 1874, I first found, together with H. Dujar- 
dint, growing plentitully on this coast, viz. Budleigh- 
* Hmended posted, p. 255. 
