Mr. H. J. Carter on new Sponges. 121 
faachma-(ex. pr. P. spnula, BkO Be Se vol. wis pl. xi. 
figs. 10-13) and those Phlceodictyina, especially in the 
structure of their tubular appendages, whose wall is composed 
of a layer of fine spicules externally resting on a reticulated 
spiculo-fibrous one within ; but the body of the Polymastia is 
solid, sessile, and filled with a tough structure consisting of 
bundles of stout long spicules radiating in bundles from a 
central point, like that of Donatia, while the spiculation, 
being acuate or pinlike, is totally different from that of the 
Phloceodictyina. Balsamo-Crevelli’s Suberites appendiculatus, 
illustrated and described in the ‘Atti della Soc. Ital. de’ Scienze’ 
for 1863, vol. v. tav. vi. figs. 10-17, is no doubt an appen- 
_diculate Polymastia. 
Having thus introduced the subject, I will now briefly 
enumerate the species of Phlceodictyina that have come to my 
notice, beginning with the British one first mentioned :— 
1. Desmacidon Jeffreysit, Bowerbank. 
(= Oceanapia Jeffreysit, Norman.) 
Well described by the latter in 1868 (Report Brit. Asso- 
ciation, p. 334); well illustrated by the former in 1874 (Mon. 
Brit. Spong. vol. ii. pl. Lxii.), but the flesh-spicule (biha- 
mate) is omitted, although mentioned in the description. 
Skeletal spicule acerate ; flesh-spicule bihamate. 
Loc. Shetland. 
‘Type specimen in the British Museum. 
2. Rhizochalina oleracea and R. carotta, Schmidt. 
Described and illustrated in 1870 (Spongf. Atlantisch. 
Gebiet. pp. 35, 36, Taf. iv. figs. 1, 2). Spicule of one kind 
only, viz. acerate, curved, sharp-pointed at each end, smooth, 
Loc. Antilles. 
3. Desmacidon fistulosa, Bowerbank. 
Well illustrated in 1873 (Proc. Zool. Soc. Lond. p. 19, 
pl. iv. figs. 7, 8). Tubular appendages “above only.” Dermal 
layer smooth, yellowish, glassy, like a varnish in its dried 
state (‘“ coriaceous,” Bk.),? from the abundance of dried sar- 
code. Spicule of one kind only, viz. acerate, curved, fusiform, 
sharp-pointed at both ends, smooth. 
Loc. Freemantle, 8.W. Australia; Gulf of Manaar. 
Type specimen in the British Museum, Bowerbank general 
collection. There is also a specimen in the general collection 
of the British Museum, No. 513, but with no other label. 
A, Desmacidon fistulosa, vay. fuliginosa, Crtr., n. vay. 
In the Bowerbank general collection, now in the British 
