48 



I. IJIMA. 



17. V. namiyei, n. sp. 



Slightly compressed sack with broad irregular hase and a firm wall of 

 moderate thickness. Dimensions, 7<> mm. high and 30 — 56 mm. broad. The 

 sponge has tendency to produce secondary oscula or persons by budding or divi- 

 sion. Autodermalia consist of stauractins and pentactins with stout, strongly 

 prickly rays, 90 — 165 fi long. Gastralia, of pantactins ani hexaetins, consti- 

 tuting a continuous antogastral layer. Parenchymal megasclercs are exclusively 

 diactins. Intermedia : Oxyhexaster, 52 — 7b' fi iu diameter ; each very short 

 principal bearing 2 — 4, diverging, nearly straight, minutely prickly terminals. 

 Discohexaster spherical, 50 — 100 /i in diameter ; principals exceedingly short, 

 each with 3 — 5 or more, slender terminals that end with distinctly toothed 

 discs. 



But for the absence of a distinct stalk and the presence of hexactinic 

 antogastralia, this species might be put under Crateromwpha. 

 Loc. : Sagami Sea. 



Crateromoepha (J. E. Gray) Carter. 



Autodermalia, hypodermalia and intermedia as in foregoing genus. Gast- 

 ralia, pentactins ; occasionally stauractins. Sponge-body with distinct narrow 

 stalk, which generally contains a system of anastomosing canals. 



Artificial Key to species. 



a'. Autodermalia, Btauractins and pentaclios. 



b'. The wall with a system of anastomosing intercanals; 

 through-going passages present at the junction of body 



with stalk 



h" '. Without above-mentioned characters. 



c". Microdiscohexaster spherical ; stalk with anastomosing 



canals 



c'. Microdiscohexaster with each bunch of terminals mak- 

 ing a prominence at surface ; stalk simply tubular 



a". Autodermalia, exclusively ppntactins ; hypcdermal pentac- 



tin unusually thick-rayed 



a"'. Autodermalia, almost exclusively stauractin; discohexaster 

 thick-rayed 



18. C. meyeri (J. E. Gray) Carter. 

 Carter, Gray, etc. — Schulze (Chall. Rep. Hep. Hex., p. 161, pl. LXI). 



(Rev. Asc. u. Ross., p. 540). 



C. comigala. 



.C. meyeri. 

 .0. ihierfddtri. 

 . C. pechyadina. 

 C tumide. 



