104 



Dr. T. Wright on Fossil Echinodernis 



MOLLUSCA. 



Nautilus, 2 sp., undescribed. ' 



Scalaria retusa, Brocchi. 



Voluta, Mitra, Cyprsea, Conus, 2sp., 

 Columbella, Oliva, Natica, Turri- 

 tella, Turbo, Pleurotoma, Pyrula, 

 Phorus, Troclius; — casts only of 

 these genera. 



Ostrea Yirleti, Desk. 



navicidaris. Desk. 



Pecten ciistatus, Bronn. 



squamulosus. Desk. 



Burdigalensis and 3 other sp. 



Area, Isocardia, Venus, and Tellina, 

 in the form of oasts. 



Terebratula ampulla, Brocchi. 



bipartita. 



Bryozoa. 

 Cellepora mammillata. 

 Retepora. 



ECHIXODERMATA. 



Cl}"]5easter altus et var. C. turritus, 

 Leske. 



marginatus, Lamk. 



folium, Agass. 



Echinolampas Richardi, Desmoid. 



Kleinii, Goldf. 



Conoclypus plagiosomus, Agass. 

 Brissus oblongus, Forbes. 



FORAMIXIFERA. 



Lenticulites complanatus, Defrance. 



CORALLIA. 



Caryophyllia. Fungia. 



No. 3, 77ie clay bed, has a dark blue, drab, or a light gray 

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

 of gj^sum, 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. 



ECHINODERMATA. 



Spatangus Desmarestii, Goldf. 

 Pericosmus latus, Agass. 



CORALLIA. 



Fungia ? 



Fishes. 



Teeth of Myliobatis, Lamna, Car- 

 charias, and Euphyllia, are abun- 

 dant. 



MoLLUSCA. 



Megasiphonia zic-zac ? (alhed to the 



London-clay species). 

 Scalaria, Pleurotoma, Mitra, Cassis, 



Rostellaria, Conus, 3 or 4 sp., 



Pecten, 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 Hemiastei- 

 ScillcB is the most abundant species. These Urchins are often 

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

 away the surrounding rock. They are very seniceable 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 : — 



