246 The Atnerican Geologist. October, i9C0 
This blastoid varies quite a great deal in the character of the 
ornamentation, size, shape and in the size of its basal plates 
and in the depth of the basal concavity. In some specimens, 
notably the typical Melo, the ambulacra are sunk deeply 
between the radial lips and the deep intcrradial sutures give 
the specimens a truly melon shape. In other specimens the 
ambulacra are scarcely below the level of the radial boundaries. 
The variety with a large flat base approaches Cryptoblastus 
projectus. 
The disposition of the granular ornamentation to pass from 
hardly noticeable lines of granules to fascicles gives rise to 
many elegant shapes. 
A very rare variety is constricted at the top of the radials 
or fork pieces and again at an equal distance above the base, 
giving an appearance not unlike that of a beer keg. While in 
most of the specimens the interradials or deltoids stand out 
strong above, one very queer variety has the radials or fork 
pieces very prominent at their upper extremities and the del- 
toids much below them and tucked in at the central opening. 
This same variety has a broad, flat base. The strong lines of 
granules are conspicuous on Cryptoblastus concinnulus, prob- 
ably only a variety of Melo. One well marked variety has 
very small granules, shallow ambulacra and an almost cir- 
cular outline in a cross section. 
The statement that the young of granatocrinoid blastoids 
are elongate while the adults are globose will hardly hold, as 
an extensive collection of any Burlington species will show. An 
undescribed species, associated with Melo and its varieties in 
the 3rd division of the Lower Burlington, is elongate with 
minute granules and having the ambulacra level with the top 
of the radial lips and is midway between Melo and Pisum. 
Cryptoblastus projectus is probably nothing more than a 
strongly marked variety of Melo, although the ornamentation 
is much finer. 
In spite of the fact the deltoids in Alelo are small, yet in 
seVeral of the varieties they are conspicuous even in their 
smallness, as they take on a warty appearance and are horn- 
like at the upper part and in strong contrast to the previously 
mentioned variety, in which the deltoids are depressed and 
much below the level of the upper end of the fork pieces. 
