46 ART. 1. 1. IJIMA : HEXACTINELLiDA, 111. 



The oxystauractins composing this have now greatly grown in 

 dimensions ; their smooth, gradnally tapering rays may be -57 ,« 

 long. All that I can say concerning the soft j^arts is that the 

 cells (or nuclei) within the hollow of the skeletal system are now 

 arranged, not compactly crowded as before, but in irregularly 

 reticular tracts, evidently on account of the formation of vacant 

 sinus-like spaces. 



The above account of the larval development, incomplete as 

 it is, will be corroborated and in a measure also supplemented 

 by the description, to l)e given in another place, of the same 

 process in Vitrollula fertile. 



LEUCOPSACUS SCOLIODOCUS '' Ij. 



PI. III., %. 27-37. 



Le2icopsacus scoliodocus, Ijima, '98, p. 43. 



This species is now known to me in more than a dozen 

 specimens, all from the Sagami Sea and a depth of 400 hiro 

 (313 fms. =572 m.) or thereabout. They represent fusiform, ovoid 

 or globular, moderately thick- walled sacs, up to the size of a 

 small acorn or a hazel-nut. The ^particulars about the specimens 

 are as follows : 



Specimen No. 233 of the Sei. Coll. Mus. (the largest of the 

 three shown in PI. III., fig. 27) is globular but somewhat 

 laterally compressed. Height 17 mm.; breadth in the middle 

 10-13 mm., wall 4mm. thick in the thickest part. The constricted 



* (T/.oAiô:, curved ; oo/o:, Leaiu. 



