ITS DISK. 93 



a short description and a figure taken from this latter 

 specimen. The specimen which I have found is evi- 

 dently identical with this, though there are some 

 differences in the form. 



When extended, it stands ahout ^rd of an inch in 

 height, shaped like a goblet, with an oval body, some- 

 what flattened, being broad in one aspect, and thin in 

 another at right angles to it. Tliis is perpendicularly 

 corrugated, so as to form four irregular lobes. Above 

 the body there is a decided neck or constriction, not 

 indicated in Dr. Johnston's figure, above which the 

 tentacular disk expands much like the mouth of a 

 phial. Below, the body is supported by a corrugated 

 footstalk, capable of considerable extension and con- 

 traction, terminating in a flat, dilated, sucking disk. 



Viewed from above, the tentacular disk is seen to be 

 a pellucid gelatinous membrane, of a form indistinctly 

 stellar, with eight points. The spaces between the 

 points are furnished with tentacula, about twelve in 

 each space, which are short, rather crowded, and set 

 in three rows, a little overarching the margin. Those 

 in the middle of the interspace are the longest, and 

 the length diminishes on each side : the points them- 

 selves are destitute of tentacles. The tentacles are 

 composed of a thick cylindrical stem, which has a 

 central opaque core ; and a globular white head, which 

 under a power of 300 diameters, showed neither hairs 

 nor ciliary action, but appeared viscous. The tenta- 

 cles originate without the margin of the disk, for 

 the edge of the latter is distinctly traced within 

 their bases. 



The delicate transparent disk is shallowly funnel- 



