6 
VICTORIA MEMORIAL MUSEUM. BULLETIN NO. I 
ing R$ and brachials, the outline of which is unaffected by them. 
On the right, the tube-plates abut against the brachials and Rs 
in such a way as to affect their outline, and to present the appear- 
ance of a sutural union with them, at least up to IRr 2 , if no 
further. It may also be more than a coincidence that the anal 
tube and the r. post, arm are broken off at the same level, 
whereas all the other arms are broken off at another, lower, 
level. All these facts are of a piece with others to which I have 
more than once directed attention, as indicating an intimate 
connexion between the anal tube and the r. post, arm in In- 
ad unat a. 
Ornament. The surface of the cup-plates is smooth to the 
naked eye; but in places there is a suggestion of granulation 
here and on the lower brachials. 
The Stem is not wholly preserved, “as some pieces aggrega- 
ting several inches in length were lost subsequent to the collec- 
tion of the specimen. The aggregate length of column preserved 
is nearly ten inches ” (W. R. Billings). Considering the small 
size of the cup, this length of stem, not less than 35 cm., is indeed 
remarkable. 
The stem is quinquepartite throughout, with radial sutures. 
The lumen is pentagonal, with radial angles; its diameter is 
about one-third that of the stem, being rather more than this in 
the proximal (Plate I, fig. 8) and distal (Plate I, fig. 7) regions, 
and rather less in the median region (Plate I, fig. 6). 
At its junction with the cup the diameter of the stem is 
3 • 6+2 * 8 
- =3-2 mm. A length of 5*4 mm. is still attached to 
the cup (Plate I, figs. 1, 2) and the diameter of the distal end of 
this is 
2*8+2*3 
2 
= 2*55 mm. 
Within this length are 27 colum- 
nals. These alternate in height with fair regularity, owing, it is 
probable, to the intercalation and growth of young columnals 
throughout this proximal region. The respective heights of high 
and low columnals may be estimated at 0*26 mm. and 0 • 13 mm. 
Each pentamere is slightly curved upwards, so as to accord with 
the re-entrant angle between the IBB; this produces a wavy 
appearance. Since the pentameres of the thinner columnals 
thin towards their edges, this arching is gradually counteracted 
in the more distal regions. The sutures are strongly crenelate. 
