Mr. J. Y. Johnson un a new Sponge. 257 



red colour, which deepens on being boiled into the pinky red of our 

 Prawn. It may be readily distinguished from Penceus 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 antennae and the eye-stalks, by the much greater length 

 of the filaments of the superior antennae, 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 .51 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 



plates 6 j\ 



Rostrum, length l-g 



Carapace, without rostrum, measured at the side, and 



including the frontal spine 1 -fg 



Carapace, width. ... -^ 



Abdomen, length to the tip of the caudal segment . . 3^| 



First legs, length 1 g 



Fifth legs, length 2 Jg- 



Outer pedipalps, length 1 1^ 



Description of a New Siliceous Sponge from the Coast 



OF Madeira. By James Yate Johnson, Corr. Mem. Z. S. 



Order SILICEA, Bowerbank. 



Dactylocalyx, Bowerbank, Phil. Trans. 1862. 



Skeleton siliceo-fibrous. Fibres solid, cylindrical. Reticulations 

 unsymmetrical. 



Dactylocalyx Bowerbankii, sp. n. 



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 



