BABBAGE ON THE TEMPLE OF SEKAPIS, 



195 



The whole plain called La Starza, which lies between the inland 

 cliffs and the sea, is of modern formation and consists of beds of 

 pumice or sand, containing recent marine shells, bones of animals and 

 fragments of building not rounded by attrition. 



Fie. 3. 







'-^^ m^sli ^ 



A Pozzuoli. 



B The Bridge of Caligula. 

 C The Temple of Serapis. 

 D The Amphitheatre. 



E The Arch of Antoninus Pius. 

 F The Temple of Neptune. 

 G The Temple of the Nymphs. 

 H La Starza. 



There are also the remains of two Roman roads, at present under 

 water ; one of these reached from Pozzuoli to the Lucrine lake. 



50. Another vestige of the art of a remote period which exhibits 

 decided evidence of a change of level, is the series of piers placed in 

 the sea, projecting from the town of Pozzuoli, and known by the name 

 of the bridge of Caligula, 



The general depth of the sea around these piers is from thirty-five 

 to fifty feet. There are thirteen piers standing, and two others ap- 

 pear to have been overthrown, as the soundings between the sixth 

 and seventh piers and between the twelfth and thirteenth prove. 



51. At the height of about four feet above the present level of 

 the sea on the sixth pier* is a line of perforations, apparently by the 

 Modiola or other boring animal. There are also Serpulse and other 

 indications of a line of sea-level. I did not find any remains of the 

 shells, and the holes appeared to have been much worn by water. 



The depth round this pier, at very small distances from it, was from 

 thirty to fifty feet. 



52. On the last pier but one there are great numbers of similar 

 perforations, but I did not discover in them any of the shells: there 

 are also adhering to the bricks great quantities of Serpulae, and some- 

 thing which appeared like a Flustra. I think these holes are incon- 



* I am not quite certain from my notes whether the pier here described is not 

 the fifth, but I am inclined to think not. 



