56 Dr. T. Wright on Fossil Echinoderms 
line observed in Sicily from the Val di Noto to Polizzi. Nume- 
rous faults traverse the N.W. half of Malta and the S.E. of Gozo, 
which have much disturbed the beds, caused the depressions now 
forming the north and south channels between Cumimo and Malta 
and Cumino and Gozo, and left the islet of Cumino an isolated 
fragment of the uppermost beds, which attests the former con- 
tinuity of the land, before these islands were fractured by subter- 
ranean and denuded by aqueous agency. ‘“ The mineral deposits,” 
says Capt. Spratt, “composing this group, have a thickness of 
800 feet visible above the sea ; they lie nearly horizontal, and are 
conformable, although there is a great diversity of mineral cha- 
racter and condition in the series. None of the deposits are 
wholly destitute of organic remains; but, on the contrary, they 
generally contain them in tolerable abundance, and in a good 
state of preservation.” The strata may be divided into five groups, 
each of which contains fossils that are special to it, very few of 
the species being common to the whole series. These, in a 
descending order, are, 1st, the coralline limestone ; 2nd, the yellow 
sand; 3rd, the clay; 4th, the calcareous sandstone; 5th, the 
hard cherty limestone. 
No. 1. The coralline limestone, consists of a reddish-white 
calcareous rock, mostly hard and compact, and sometimes 
changed into an indurated calcareous sandstone. It attains a 
thickness of 100 feet, but has been much denuded in several 
localities. Some isolated portions of this bed, from . being 
slightly variegated in colour, were formerly used for certain 
durable work, under the name of Gozo marble. 
Fossils of No. 1. 
Mo.uuvsc¢a. EcHINODERMATA. 
Voluta, cast of a large species. Cidaris Miletensis, Forbes. 
Haliotis, ditto of a n. sp. Echinus Duciei, Wright. 
Troehus, ditto. Echinolampas Deshayesii, Desor. 
Spondylus quinquecostatus, Desh. | Clypeaster crassicostatus, var. of C. 
Ostrea Boblayei, Desh. altus. 
Ostrea Virleti, Desh. Brissus latus, Wright. 
Pecten Pandora, Desh. 
imbricatus, Wright. 
squamulosus, Desh. 
oblongus, Forbes, MSS. 
Burdigalensis, Desh. Brissopsis Duciei, Wright. 
Arca, casts of. Schizaster eurynotus, Agassiz. 
Cytherea, ditto. Pericosmus excentricus, Wright. 
metas 3 CoRALLIA. 
Eschara monilifera. Stylastraea. 
Escharina, n. sp. 
CRUSTACEA. 
Carapaces and chelz of several 
species. 
