j6 porifera. ii. 



Vosmaer refers E.Alderi as a synonym to Normani, and also Topsent has made considerable re- 

 ductions, and has for instance referred Alderi to fucorum, but for the present nothing can be said of 

 the correctness of these identifications. When I have thought that the present species might possibly 

 be Alderi, the only reason has been the size of the spicules; the peculiarity of the structure of the 

 chela: would scarcely have been observed by Bowerbank. 



4. E. pedicellata n. sp. 

 PI. I, Fig. 2. PL VIII, Fig. 4a-c. 



Erect, stalked , somewhat club-shaped ; the upper part lobate or winged. The surface slightly 

 shaggy ; the dermal membrane thin. The skeleton an irregular network of polysplenia)- longitudinal 

 fibres and irregularly scattered spicules. Spicula : J/egasclera styli <rjj — o-g^ mm ; viicrosclera of one form, 

 isochcla' pttliinitic croij — o-o/y"". 



The contour of this species, of which we have only one specimen, is most nearly club-shaped; 

 below it passes into a stalk attached to a shell of Astarte crenata Gray. The form is otherwise 

 irregular, the upper part being provided with irregular, broad and deep furrows running longitudinally, 

 between which are found lobes that may be so compressed as to form wings. The length of the 

 somewhat damaged specimen is 65" un , and the greatest breadth is 25™". The consistency is rather firm, 

 almost fleshy. The colour (in spirit) is something between gray and brown, approaching to olive 

 colour. The surface of the sponge, in the state of preservation in which we have it, is provided with 

 projecting spicules, but by far the greatest part of the dermal membrane is wanting; to judge from 

 the places where it is preserved, the sponge in its undamaged state is slightly shaggy. The dermal mem- 

 brane is exceedingly thin and transparent. When it is torn off and examined it shows some irregu- 

 larly scattered spicules, which thus seem to belong to the dermal membrane itself; otherwise it seems 

 to be resting on the irregular skeleton below, and some spicules project through it. Neither pores nor 

 nscula are seen, I suppose, on account of the membrane only being preserved in so few places. 



The skeleton consists of a rather irregular network; especially longitudinal fibres are found, 

 the greater part of which are polyspicular and may be of varying thickness; they contain, however, 

 always few spicules, and are not especially strongly marked. In their longitudinal course some of 

 them bend off towards the surface, which they meet at a very acute angle, and which, as far as I 

 have been able to see, they pierce. Between the longitudinal fibres scattered spicules without any 

 regular position are found, and transverse fibres are not formed. While in the upper part of the 

 sponge the longitudinal fibres have a rather irregular course, in the stalk they run perpendicularly; 

 they are here thicker and consist of more spicules, and some of the scattered spicules are placed trans- 

 versally. Some spongin is found in the skeleton, especially discernible in the nodes, and it seems also 

 sometimes to continue over the fibres; it is white and clear, and consequently only little conspicuous. 

 In the stalk the spongin is more copious, and may be seen quite to wrap the polyspicular fibres. 



Spicula: a. Megasclera are rather large styli, more or less curved, sometimes almost straight; 

 the place of the curve may be somewhat varying, and it is sometimes a little irregular. The styli are 

 slightly fusiform, tapering somewhat towards the rounded end. The other end is evenly and long 



