104 Dr. T. Wright on Fossil Echinoderms 



MOLLUSCA. BrYOZOA. 



Nautilus, 2 sp., undescribed. Cellepora mammillata. 



Scalaria retusa, Brocchi. Retepora. 



Voluta, Mitra, Cypraea, Conus, 2 sp., Echinodermata. 



Columbella, Oliva, Natica, Turri- Clypeaster altus et var. C. turritus, 



tella. Turbo, Pleurotoma, Pyrula, Leske. 



Phorus,Trochus;— casts only of marginatus, LamA:. 



these genera. Mmm, Agass. 



Ostrea Virleti, De*^. Eehinolampas Richardi, Desmovl. 



- — navicularis. Desk. Kleinii, Gold/. 



Peeten cristatus, Bronn. Conoclypus plagiosomus, Agass. 



squamulosus, De^A. Brissus oblongus. Forces. 



Burdigalensis and 3 other sp. 



Area, Isocardia, Venus, and Tellina, J^oraminifera. 



in the form of casts. Lenticulites complanatus, Defrance. 



Terebratula ampulla, Brocchi. Corallia. 



bipartita. Caryophyllia. Fungia. 



No. 3. The clay bed, has a dark blue, drab, or a light gray 

 colour, and is much charged with iron. In it are found crystals 

 of gypsum, and occasionally nodules of sulphur. It varies in 

 thickness from 30 to 60 feet. It is the retentive water-bearing 

 stratum of the islands, and all the water falling upon the upper 

 beds percolates through them, and bursts out in springs along 

 their line of junction with the clay. Casts of shells and frag- 

 ments of bones are very abundant in it ; but Echinoderms are 

 comparatively rare. 



Fossils of No. 3. 

 Fishes. Echinodermata. 



Teeth of Myliobatis, Lamna, Car- Spatangus Desmarestii, Gold/. 



eharias, and EuphyUia, are abun- Pericosmus latus, Agass. 



dant. 



MoLLuscA. Corallia. 



Megasiphonia zic-zac ? (allied to the ^ ^^ 



London-clay species). 

 Scalaria, Pleurotoma, Mitra, Cassis, 



Rostellaria, Conus, 3 or 4 sp., 



Peeten, Ostrea, Cardita, Lucina. 



No. 4. The calcareous sandstone. — ^^This bed covers the 

 greater part of the island of Malta. From it nearly all the build- 

 ing stone is procured, and it is likewise the rock from which the 

 Maltese vases are cut. The lower beds abound in Echinoderms. 

 Scutella and Schizaster are not unfrequent; but Hemiaster 

 Scilla is the most abundant species. These UrcLins are often 

 seen standing out in relief on the beach, the sea having worn 

 away the surrounding rock. They are very serviceable in afford- 

 ing a foot-hold on the rocks, which otherwise would be danger- 

 ous to land upon.^^ (Lord Ducie.) This bed is subdivided by 

 Capt. Spratt into five strata, which he thus describes : — 



