510 DR. J. E. GRAY ON SPONGES. [MaV 9, 



**** Fibres with numerous blind tubes. 



7. AULTSKIA. 



Sponge massive, irregularly netted ; fibres witli a central canal, 

 which is furnished with small blind branches radiating in all direc- 

 tions. 



Auliskia, Bowerb. Ann. & Mag. N. H. xvi. p. 405, 1845 ; Brit. 

 Sp. i. p. 210. 



Auliscia, O. Schmidt, Spong. Adriat. Suppl. ii. p. 10. 



Auliskia bowerbankii, Bowerbank, Ann. & Mag. N. II. xvi. 

 p. 405, t. 13. f. 1, 2; B. Sp. t. 14. f. 267, 268. 

 Hab. ? 



Fam. 4. Hirciniad.e. 



Skeleton formed of two kinds of horny fibres : — the one thick, and 

 with a central line of spicules or grains of sand within, reticulated, 

 forming the base of the skeleton ; the other very slender, forming 

 radiating spicular tufts, which do not anastomose. 



Filifera, Lieberkiihn ; O. Schmidt. 

 Ircinia et Ilircinia, Nardo. 



1. IIircinia, 0. Schmidt, p. 32. 

 Sponge of a lax texture ; skin less dense. 



1. IIircinia flavescens, O. Schmidt, p. 33, t. 3. f. 9, 12-14. 

 Ilab. Adriatic. 



2. Hircinia den oroides, 0. Schmidt, p. 32, t. 3. f. 10. B.M. 



See also : — 



Hircinia typica, O. Schmidt, p. 32. B.M. 



//. pa7iicea, O. Schmidt, p. 32, t. 3. f. 11. 

 //. hirsuta, O. Schmidt, p. 33, t. 3. f. 13. 

 U. hebes, O. Schmidt, p. 33, t. 3. f. 9, 26. 



//. variabilis, O. Schmidt, p. 34, t. 3. f. 17. B.M. 



//. fasciculata, 0. Schmidt, p. 34. Spongia fascimlata, Esper, 

 ii. t. 34. 



2. Sarcotragus, 0. Schmidt, p. 35. 

 Sponge very dense, nearly fleshy ; the minute fibres very abundant. 



1. Sarcotragus spinulosus, 0. Schmidt, p. 3o, t. 3. f. 18. 

 Ilab. Adriatic. B.M. 



2. Sarcotragus fqlTidus, 0. Schmidt, p. 35, t. 36. f. 3, 19. 

 Ilab. Adriatic. . B.M. 



3. Stematumenia, Eowcrb. B. Sp. i. p. 211, 1862. 

 Sponge massive, horny ; fibres of different diameters, reticulated, 



