254 



M. MIYAJIMA : 



bilateral symmetry, being interrupted at the lower (or Mark's 

 posterior) edge where the hydrocaulus is attached. 



That our specimen and Brachiocerianthus urceolus belong at 

 least to the same genus, there can hardly be any doubt. Whether 

 they belong to the same species is another question. It is per- 

 haps premature to decide this point, at present, in as much as 

 Mark has not yet publislied his full paper. Judging from his 

 preliminary notice which deals exclusively with the external 

 features, the following are the chief points of difference. 

 a. The general shape. B. urceolus is stated to have an extremely 

 graceful, symmetrical vase-like figure ivith flaring lips. The 

 lateral margins of the hydranth-disc were in the natural 

 state *' folded in symmetrically from either side, so as almost 

 to touch at a point, a little below the middle of the oval. 

 This bending in of the margins of the disk produces at the 

 upper end of the animal a sort of eccentric funnel-shaped 



depression, 



ct 



A, 



B. 



'•' The fancied resemblance of 

 the animal to a little pitcher, 

 which this side view presents has 

 suggested the specific name 

 adopted — urceolus.'" (Mark *98 

 p. 148). The pitcher or vase 

 shape of the hydranth is thus 

 due to two causes : (1) the fold- 

 ing in of the disc-margin, and 

 (2) the extreme obliquity of the 

 axis of the hydranth to the axis 

 of the hydrocaulus. In the an- 

 nexed woodcut, a represents the 

 axis of the hydrocaulus and b 



