222 



H. MATSUMOTO: 



Plirynocrinus obtorlus. 



a. Calyx and upper parts of stem, x I. b. Root and lower end of stem x t. c. Calyx and 

 upper end of stem, x 3. d. Middle parts of stem, x 3. e. Twelfth to seventh co'.umnals 

 from root, x 3. f. Calyx viewed from above, x 3. g. A columnal showing the upper 

 articular surface, x 3. 



between them. The surfaces are more narrowly elliptical in the upper 

 parts of the stem than in the lower parts, towards which they become 

 gradually broader until they finally assume a nearly circular outline. 

 The lowest columnal is but indistinctly set off from the encrusting root, 

 being in firm fusion with the latter (fig. b). Columnals in the lower 

 parts of the stem measure 6 mm. in length of the long (fiderai) axis 

 and 5 mm. in that of the short, by an average vertical length of 4 mm ; in 



