ART. 4 



SPONGES OF CALIFORNIA DE LAUBENFELS 



23 



representative, is, of course, close to the genotype, but may be sepa- 

 rated, I believe, on the basis of the extreme length of the flagellate 

 chambers. In the literature one finds few or no references to 

 chambers longer than l'25fi, though I have seen in the British Mu- 

 seum prepared slides showing chambers — presumably of the geno- 

 type — longer than 200/x; these are, however, out of the ordinary for 

 European or Australian material. In sacra they are usually well 



Figure 9. — Ilalisarca sacra de Laubenfels : Typical section perpendicular to the 

 surface. It was found impractical to draw in fine items of detail. A, An 

 oscule ; B^ subdermal cavities ; C, excurrent canals, D, flagellate chamber, 

 X120 



over 200/x and rather often reach lengths of 280jli. The general 

 picture as made by slides of sacra is so different from that made by 

 other slides of this genus that I have seen that I had a certain degree 

 of confidence in naming this as a new species. 



Order CHORISTIDA SoUas 



Family GEODIIDAE Gray 

 Genus SIDONOPS Sollas 



SIDONOPS ANGULATA Lendenfeld 



Sidonfjps amjulata Leindenfeld, 1910, p. 18 (based ou three described varieties: 



megana, microana, and orthotriaena) . 

 Sidono})s bicolor Lendenfeld 1910, p. 46. 



Holotype. — Here established as U.S.N.M. No. 8380, /?. angulata 

 var. microana. 



