PORIFERA. III. 



This species seems to be very like Phloeodictyon birotuliferum Cart. (Ann. Mag. Nat. Hist. 

 5, XVIII, 447), to judge from Carter's figure and description. This resemblance however is probably 

 only an analogy, without consequence in regard to affinity of the species (see below under the remarks 

 about the species of the genera in question). 



The two Histodermella species established here, Ingolfi and coriacea, are certainly rather nearly 

 related to each other; the outer shape, the dermal rind and the arrangement of the canal system are 

 in agreement; the differences lie mainly in the construction of the skeleton of the inner body and the 

 shape of the spined megasclera as also in the absence of microsclera in one species. 



Inflatella O. Schmidt. 



(Joyeuxia Topsent.) 



The shape roundish or the sponge more or less club-shaped, sometimes pedunculated. The con- 

 sistency bladder-like. The body provided with more or less numerous papilla. An outer, solid dermal layer 

 present, with a skeleton of close-lying spicules; the skeleton in the inner body -weak, consisting of thin 

 fibres, not forming any reticulation. Spongin not present. Spicula ; Megasclera of one form, diac final, 

 strongy/a ; microsclera not present. 



1. I. pellicula O. Schmidt. 

 PI. II, Figs. 7—9, PI. IV, Fig. 6. 



1875. Inflatella pellicula O. Schmidt, Jahresber. der Comm. zur wissensch. Unters. der deutsch. Meer. in 



Kiel fur 1872—73, 117, Taf. I, Fig. 5. 

 1885. Reniera inflata Armauer Hansen, The Norwegian North-Atlant. Exp. XIII, Spongiadae, 7, PI. I, fig. 4. 



1903. Inflatella pellicula. Thiele, Arch, fiir Naturgesch., 1903, 385, Taf. XXI, Fig. 17. 



1904. Joyeuxia viridis Topsent, Resultats des camp, scient. du Prince de Monaco, Fasc. XXV, 205, PI. Ill, fig. 12. 



Club- or pear-shaped, pedunculated, with some fen' conical papilla" above. The surface smooth, 

 flic sponge surrounded by a solid dermal layer. Oscula and pores at the summit of the papilla-. The 

 dermal skeleton formed of close-lying, tangential spicules; the inner skeleton consisting of bundles or 

 loose fibres. Spicula: Megasclera strongyla 0-42 — 0-64""". 



The outer shape of this species is somewhat well known from the descriptions cited. It is 

 elongate, pear-shaped and is attached below by a shorter or longer peduncle to a substratum. The 

 peduncle may with regard to the manner of fixation be somewhat various; either it is only fixed by 

 means of a little dilatation, or it emits stolons which may shoot out at various heights, and each of 

 which has its own attachment. This is already mentioned by Schmidt 1. c. Of the figures cited 

 above that given by Schmidt shows stolons, while the others show a single peduncle; the figure by 

 Topsent, however, shows a small projection above on the peduncle, evidently a beginning stolon, 

 as is also mentioned by the author. Above, the peduncle passes into the pear-shaped body which 

 bears one to four slender, conical papillae above. The specimen described by Topsent shows an 

 osculum without papilla. Of the specimens in my material the largest is 19""", the smallest io mm high; 



