SIDONOPS PICTETI. 223 



Twenty species are known; nine occur in the Pacific Ocean. 



The species ivith anairiaenes found in the Pacific Ocean are S. lindgreni Ldf., 

 S. pkteti (Tops.), S. californica Ldf., S. alba (Kieschnick), S. angulata Ldf. 

 (var. megana Ldf., var. microana Ldf., var. orthotriaena Ldf.), .S. oxyastm Ldf., 

 S. reticulata (Bwk.); those without anatriaenes are S. bicolor Ldf., S. nitida 

 (Soil). 



Sidonops lindgreni Lendenfeld. 



Tierreich, 190.3, 19, p. 102. 



Siilonops jricteli Lincgren (non Topsent 1897), Zool. anz., 1897, 20, p. 486. Zool. jahrb. Syst., 1898, 11, 



p. 349, plate IS, figs. 17, a, b, plate 20, fig. 6, a-h, c'-c", d'. Kirkp.\trick, Proc. Zcol. soc. London, 



1900, p. 130. 



Massive irregular, sometimes with digitate processes. Cortex brown, 

 choanosome grayish. 



Large choanosomal amphioxes: 2.5 mm. by 40 fi. Minute dermal styles: 

 240 by 5 /«. Orthotriaenes: rhabdome 2.4 mm. by 54 /i; clades slender, strongly 

 concave to the rhabdome, 756 p. long. Proclades (mesoproclades): triaene, 

 diaene, or monaene; rhabdome 4.6 mm. by 24 /c, clades 100 jli long; cladome 

 140 n broad and 70 /« high. Anairiaenes: rhabdome 3 imn. by 12 /<; clades 

 stout, 68 /i long; cladome 80 fi broad and 60 p. high. 



Choanosomal oxyasters: rays rough, pointed, very numerous; centrum 

 small; total diameter 20-48 p. Small strongylosphaer asters: centrum large; 

 total diameter 4 /I. Stenasters: 160 by 120 ju. 



? Western Pacific. Java. 



Sidonops picteti Topsent. 

 Revue Sui.sse zool., 1897, 4, p. 431, plate 18, fig. 2. Lendenfeld, Tierreich, 1903, 19, p. 103. 



Massive tuberous, elongated. Inspirit: reddish gray. 



Amphioxes: 500-600 by 30 /«. Orthotriaenes; rhabdome of similar dimen- 

 sions as the amphioxes; clades slender, 90 p. long; cladome 185 p broad. 

 Protriaenes (? mesoprotriaenes): rhabdome 10 p thick; clades 70 p long. 

 Anatriaenes: rhabdome 10 p thick; cladome 70 p broad and 53 p high. 



Oxyasters: usually from seven to twelve slender, spined, conical rays, 2 p 

 thick; centrum small; total diameter 35-40 ;«. Strongylosphaa-asters: centrum 

 large; total diameter 4-6 p. Sterrasters: 97 by 85 p. 



Topsent, 1897, states that in another specimen the sterrasters measured 

 140 by 115 p. I should say that this sponge probably belongs to another species. 



Western Pacific. Bay of Amboj-na. 



