152 Proceedings of the Royal Irish Academy. 



"smooth," as the swellings of the fourth-cycle tentacles do not join the 

 tubercles of the sc-apus (they only run a little way down the capitulum) — 

 this being clear in parts of expanded specimens. (PI. XVI. fig. 30.) 

 Reference to the numerous small areas of capitulum represented in P). XVI 

 (figs. 30. 32, 33, 34-37) will perhaps show more clearly how this is. How 

 far any ridges would be present in a living and expanded animal it is 

 difficult to say. Fig. 31 shows how the "coronal" tubercles may or may 

 tn.t be continuous with the next one below them, in the same specimen. 

 The basal swellings of the tentacles vary in development— they may be 



_ ■■! than the tentacle itself, or ijiiite insignificant. 



III. We now come to i set mens of which PI. XIV, fig. 9, may 



be tak^n as the type. The majority of these (seventy-three specimens) were 

 taken at one haul. V them were very young and small. They pre- 



sent a contrast to the kind typified by PI. XIV, fig. 3, because the base is 

 not a mud- _ cup, but an al disc, and the capitulum in 



fig. 9 is hidden. In fact, these specimens have the fades of Borm/iihia 



Miiller. It is curious that, a 1 have gone 



with the collection, n« >t a bu i en of If. digitata has turned up. 



Dr. E. J. Allen, however, has kindly lent me specimens of it from the North 



mparison, and also of //. a/a, Goe ,.. One specimen of 



showed very distinct capitular ridges, but absolutely no trace of 



d swellings t" the tentai lea. In the Irish specimens under consideration, 

 however, which must be lather young, in all cases which I examined I could 



clearly trace has.!] swellings on the inner tentacles, though they were very 

 .-mall and fiattem Sections smonstrate them quite clearly. More- 



•. the typical gement— continuity between swellings of 



fourth-cycle ten! ironal" tubercles — can be traced, though only 



inconspicuously owing to small Bize an e bion of the specimen-. 



M 3 seem to havi to shell-, and the flat or 



■ may or may not exceed the column. I take 



it that this difference in the form of thi thin the limil species 



no iiri] uid varies simply according to habitat; if the animals 



live "ii a muddy bottom, it is natural that they should form mud-anchors. 



er hand, they live on a stony bottom oi on shells, they develop an 



adh( the kind of anemone that could mo 



v youth. Verrill (51 has recorded similar 

 cases, in which ai me species develop mud-enclosing 



ling to habil 3 larly, if some specirn 

 should attach tie to a cylindrical object, the base would become long 



and narrow in consequence. One of my specimens seems to have enclosed 



