SIDONOPS PICTETI. 



223 



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



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

 8. picteti (Tops.), S. californica Ldf., S. alba (Kieschnick), *S. angulata Ldf. 

 (var. megana Ldf., var. microana Ldf., var. orthotriaena Ldf.), ;S. oxyastra Ldf., 

 *S. reticulata (Bwk.); those witJiout anatriaenes are *S. hicolor Ldf., S. nitida 

 (Soil.). 



Sidonops lindgreni Lendenfeld. 



Tierreich, 1903, 19, p. 102. 



Sidonops picteti Lindgren (iion Tniisont 1897), Zool. aiiz., 1897, 20, p. 486. Zool. jahrb. Syst., 1898, 11, 

 p ."549, plate 18, figs. 17, a, b, plate 20, fig. 6, a-h, c'-e", d'. Kirkpatrick, Proc. Zcol. soc. London, 

 1900, p. 1.30. 



Massive irregular, sometimes with digitate processes. Cortex brown, 

 choanosome grayish. 



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

 240 by 5 /I. Orthotriaenes: rhabdome 2.4 mm. by 54 clades slender, strongly 

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

 diaene, or monacne; rhabdome 4.6 mm. by 24 /t; clades 100 /« long; cladome 

 140 fi broad and 70 /< high. Anatriaenes: rhabdome 3 mm. by 12 /r, clades 

 stout, 68 n long; cladome 80 // broad and 60 [i high. 



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

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

 total diameter 4 p.. Sterrasters: 160 by 120 fi. 



? Western Pacific. Java. 



Sidonops picteti Topsent. 

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



Massive tuberous, elongated. In s])irit : reddish gray. 



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

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

 Protriaenes (? mesoprotriaenes): rhabdome 10 fi thick; clades 70 /< long. 

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



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

 thick; centrum small; total diameter 35-40 p. Strongylosphaerasters: 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 /(. I should say that this sponge probably belongs to another species. 



Western Pacific. Bay of Amboyna. 



