130 
THE MEDITERRANEAN NATURALIST 
Dragonara in Malta and of other localities where 
this bed lies exposed, abound with a beautiful 
sea-urchin Scutella subrotunda , which forms depo- 
sits of from two to three feet in thickness. This 
scutella bed generally marks the line of demarca- 
tion between the Lower Coralline Limestone and 
Globigerina Limestone, but it is sometimes 
replaced, as at 
Ricasoli, by a 
soft, white va- 
riety of rock a- 
bounding with 
the spines and 
tests of several 
species of Cida- 
ris with quanti- 
ties of Heieros- 
tegina and with 
great numbers, 
of a small bra- 
chiopod Thed- 
dium adarnsi. . 
At II Mara, 
Fommer-Rih, 
and Migiar Sci- 
ni, too, the 
rocks along the 
shores contain 
considerable 
quantities of the 
flat forami aile- 
rons molluscs 
Heterostegina , 
but as a rule 
they are much 
larger, and more 
strongly deve- 
loped than are 
the Heterostegi- 
na depressa of 
the “Green- 
sand” bed. Along the shores of St. Julians Bay in 
Malta, and in the Munsciar Gorge in Gozo a very 
large species of Heterostegina occurs in consider- 
able quantities. It often attains the size of a half 
a crown piece, and therefore to distinguish it from 
the smaller varieties Dr. Adams named it Hete- 
rostegina Strichlandi. 
Another organism that is equally abundant 
near St. Leonardo and St. Qeorgio is a thin, flat, 
discoidal foraminifera Orbitoides Mantelli , most 
of which attain a diameter of from 3 to 4 inches, 
and associated with them is another species of 
a biconvex form Orbitoides despansus (Sowerby.) 
The mollusca and the echinodermata are also 
largely represented as will be seen upon referring 
to the list of 
the fossils of 
this formation. 
In the semicry- 
stalline portions 
of the upper 
parts of the bed 
the smooth, gol- 
den colored, but- 
ton-shaped 
teeth of the 
large skate My- 
liobates , are 
found associa- 
ted with the pa- 
latine teeth of a 
large globe-fish 
Diodon ; and at 
F o m m - e r- R i h 
at the same ho- 
rizon there is an 
extensive bed 
composed of 
Ostrea navicu- 
laris , and 0 . bob- 
layei. 
Owing to the 
crystalline cha- 
racter of the 
rock, the diffi- 
culty of obtai- 
ning access to 
the best sections 
of it, and its 
extremely hard nature this formation has not been 
so thoroughly worked out as the other beds have. 
Further researches will, therefore, I have no doubt, 
be the means of making many more additions to 
its fossil fauna. 
The Globigerina Limestone: — Until recently, 
j this portion of the Maltese deposits was known as 
i the “Sandstone” or “Freestone” group. Captain 
■g * fel 
on $4 
