86 ITS DISK. 



a sliort description and a figure taken from this latter 

 specimen. The specimen which I have found is evi- 

 dently indentical with this, though there are some 

 differences in the form. 



When extended, it stands about one-third of an inch 

 in height, shaped like a goblet, with an oval body, 

 somewhat flattened, being broad in one aspect, and 

 thin in another at right angles to it. This is perpen- 

 dicularly 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 200 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 witliin 

 their bases. 



The delicate transparent disk is shallowly funnel- 



