SPONGIIDA. 413 



by a short narrow pedicle, which rises broadening and flattening, 

 and producing two broad expansions) about 2~) millim. long, which 

 bend to one side, where they meet and unite by their apices. 

 The fragment consists of a similar wing-like expansion ; so that 

 this character is probably more or less constant in the species. 

 The large size of the spicules and the coarse, though vague, dermal 

 skeleton seem to justify the generic position I have assigned to tho 

 sponge. Pellina bibula, Schmidt (Baltic), resembles it in form, but 

 has no apparent vents, and the spicules measure only "13 to 24 millim. 

 in length. 



47. Pellina, sp. 



Tubular. Part of a specimen, consisting of a detached subcylin- 

 drical tube, 30 millim. long, 10 millim. in extreme diameter, wall 

 2*5 millim. in greatest thickness; tube contracted towards mouth, 

 which is 4 millim. across and has a thin margin. Consistence firm, 

 brittle ; colour dull brown. Skeleton irregular ; tracts loose. Spi- 

 cules smooth acerate, slightly curved, tapering very gradually to 

 sharp points ; size '6 by '02 millim. 



The spicules are larger than in the European species of tho genus ; 

 but I do not assign a specific name, as the specimon is imperfect. 



Hah. Port Curtis, Queensland, 11 fms. 



Some very small, massive, rounded specimens from Port Darwin, 

 between tide-marks, with spicules measuring *8 by "02 millim., are 

 perhaps young forms of a variety of this species. 



48. Pellina, sp. 



Massive. Nearly allied to " Reniera, yellow" of Carter (Ann. & 

 Mag. N. H. (5) vi. p. 48), from the Gulf of Manaar, and possibly iden- 

 tical with it, although that form seems to be paler in colour, and its 

 spicule as described would be about "24 by '02 millim. in size. It seems 

 to consist normally of a massive base, which sends up digitate pro- 

 cesses, suboval in transverse section and about 15 millim. in greatest 

 basal and 5 millim. in greatest apical diameter respectively. Con- 

 sistence in spirit firm, brittle ; colour dull brown. Surface even, 

 covered by thin glabrous dermal membrane. Vents few, scattered 

 usually on the narrow margin of the sponge, receiving the larger 

 excretory canals at a slight distance below surface, oblong, maximum 

 greater and less diameters usually 3 and 1*5 to 2 millim. respec- 

 tively. Main skeleton composed of loose spiculo-fibro 1 to 2 spicules 

 broad ; the primaries only approximately vertical to surface ; the 

 secondaries irregular in direction. Dermal skeleton reticulate ; 

 fibre usually 2-3-serial, very loose. Sarcodo reddish brown, some- 

 what granular. Spicules smooth acerate, tapering to sharp points 

 from about four diameters from ends; size "38 by -0127 millim. 

 Specimens fragmentary. 



Another compressed specimen, terminating in an angle above, and 

 with a single orbicular vent about 3 millim. wide, leading deeply 



