HEXACTINELLIDS WITH DISCOCT ASTERS. 



slender and straight terminals. Cases of a uniterminal principal have 

 not been met with. 



Microdiscohexasters of usual structure found scattered in the 

 parenchyma. 



Autodermalia consist mostly of faintly rough stauractins of variable 

 size, with occasional pentactins and triactins, rarely with diactins. Some 

 of these autodermalia are twice or even thrice as large as others. Ra- 

 dius 90-270// ; rays 9-13// thick near centre. Ends of rays rounded or 

 even clubbed. Autodermal meshes irregular, not rectangular. 



Hypoderrnalia consist of irregularly distributed pentactins, with 

 occasional stauractins and triactins. Paratangential rays under l fe mm. 

 in length ; smooth, but often sparingly rough near the conically pointed 

 end ; not paratropal. 



Autogastralia include faintly rough pentactins and stauractins, more 

 rarely triactins and diactins. Kay-length 55-100// ; thickness near 

 centre 6.5// in average. They are not present in large numbers. 



8. Staurocalyptus glaber, n. sp. 



Goblet-like or vase-like ; laterally compressed ; thick-walled. Tex- 

 ture loose and light-looking. In young state with long dkctin pleural 

 prostalia ; with age these become entirely lost or confined to oscular 

 margin. Prostal pentactins not found. The body may attain a height 

 of 250 mm. Several specimens from Sagami Sea. 



Principal parencby malia more or less bent in bow-like manner ; not 

 over 13 mm. in length. 



Discoctasters especially abundant in subgastral region ; very large, 

 having radius of 250-330//, although smaller ones are not wanting. 

 Terminals 5-6 to each principal, nearly straight, slightly diverging ; 

 discs pin-head like. 



Oxyhexasters 49-57// in radius. Principals short but usually dis- 

 tinct ; each with 2-4, usually 3, very slender terminals, which are faintly 

 rough near base. 



