Mr. J. Y. Johnson on a new Sponge. 257 
red colour, which deepens on being boiled into the pinky red of our 
Prawn. It may be readily distinguished from Peneus Caramote, 
which has also been taken on the coast of Portugal, by the single 
crest on the carapace, by the absence of teeth from the underside of 
the rostrum, by the presence of a spine near the anterior lateral 
angles of the carapace in addition to the spine between the bases of 
the inferior antennze and the eye-stalks, by the much greater length 
of the filaments of the superior antenne, which in P. Caramote are 
not more than a fourth of the length of the carapace minus the 
rostrum, by the absence of spines from the two basal joints of the 
second and third pairs of legs, and by the presence of a single spine, 
in place of three, at each side of the caudal segment of the abdomen. 
Examples having a total length, including the rostrum, of 57 inches, 
and a carapace with a width of rather more than half an inch, are not 
uncommon ; but the finest specimen I have seen was kindly pre- 
sented to me by Dr. J. V. Barbosa de Bocage, Director of the Royal 
Museum of Lisbon. This specimen, which is now in the British 
Museum, has the following dimensions :— 
inches. 
Total length from tip of rostrum to end of caudal 
FERAL oecetensa te OULU Fie cree cite oe leetonade Sie 6,5, 
paca tenet hy ity 2.ci3/2lsi2 9 tt 2 tierolaiee Seah 1} 
Carapace, ihout rostrum, measured at the side, and 
including the frontal spine ............ Emenee 148 
MINE EM WLU AV bk ak ealbmiok ine creole Lh 19 
Abdomen, length to the tip of the caudal segment.. 313 
First legs, length Sak ieee he 
Fifth legs, length . Sh ie eta shpat ated wade Ws WR 
Outer pedipalps, length. . SRA ATS Nee aed ne COs Pacers 1% 
DeEscrIPTION OF A New SILIcEous SPONGE FROM THE COAST 
or MaperirA. By James YATE JOHNSON, Corr. Mem. Z.S. 
Order SILICEA, Bowerbank. 
DactTyLOcALyx, Bowerbank, Phil. Trans. 1862. 
Skeleton siliceo-fibrous. Fibres solid, cylindrical. Reticulations 
unsymmetrical. 
DactyLocaLyx BowERBANKII, sp. 0. 
The skeleton of this sponge is composed of an inelastic network 
of silex of a dense and irregular structure. Under a power of sixty 
diameters a slice of it resembles the crumb of bread, without any 
trace of the structure resembling spoked wheels, such as is exhibited 
by a siliceous sponge preserved in the Museum at Paris under the 
name of Iphiteon,—a similar structure being also seen in the pith of 
some water-plants. The fibre is smooth, but somewhat nodulous. 
The skeleton is covered with a rather thin crust, of a close texture, 
without conspicuous orifices, and this crust abounds with large 
spicula of the form denominated “ spiculated patento-ternate’’ by 
Dr. Bowerbank in his memoir read before the Royal Society in 1857 ; 
and some of them are developed into the dichotomo-patento-ternate 
