224 I. IJIMA : HEXACTINELLIDA. I. 



which will be described after I shall have finished with my 

 accounts of the full-grown specimens. 



General Characters of Full-Grown Specimens. 



The species may attain a very considerable size. A superb 

 specimen was that which w-as purchased by Prof. A. Agassiz in 

 Yokohama and taken to the United States. The vase-like body 

 measured 400 mm. in height. Diameter of the sieve-plate 140 mm. 

 Width of the cuff 60 mm. in the broadest part. Some of the 

 parietal ledges as high as 55 mm. 



Another large specimen, belonging to Mi\ Alan Owston, 

 measured 420 mm. in total height. The upper portion of the 

 body was rather abnormally inflated into a bulbous shape, 

 presenting diameters of 270-330 mm. Near the basal end the 

 breadth measured 30-83 mm. 



In the Sci. Coll. Museum there is one exquisite specimen 

 which is not very large but is pi'cserved in alcohol in an almost 

 perfect condition. This is shown in PI. YII, fig. 1, in half 

 natural size, and will here be described somewhat in detail. 



It is of an elongate vase-like shape, 185 mm. high, and of 

 very irregularly corrugated external aspect on account of the 

 parietal ledges. The breadth measures 72-80 mm. across the 

 cuffed upper end ; 40-58 mm. directly behind the cuff; 65-75 mm. 

 at the middle of the body ; and 15-20 mm. at the contracted 

 base close to the solid, irregularly lobed basal mass. The cross- 

 sections of the body-wall near the upper and the lower ends are 

 nearly oval ; it is more irregularly shaped in the middle. 



The sieve-jylate is well arched and oval in outline, measuring 



