AUSTEN — TERTIARY DEPOSITS OF THE SUSSEX COAST. 51 



Natica monilifera, Lam. 



Living, on most of our coasts ; ranges as far as North Coast 



of Spain. 

 Fossil, in the Red Crag. 

 Centhium reticidatum, Da Cost. = C. lima, Brug. 



Living ; British distribution. West and South ; it is remarked 

 by Messrs. Forbes and Hanley that this species is " appa- 

 rently of comparatively recent origin within our area." It 

 ranges along the Coasts of Spain, Portugal, ^Mediterranean, 

 Africa, Canaries, &c. 

 Fossil ; has not been found in the Crag deposits, but occurs 

 in the marine beds of the Nar Valley (Norfolk), and abun- 

 dantly in Sicily {Phil.). 

 Scalaria communis. Lam. 



Living ; British distribution. West and South, to the Medi- 

 terranean. 

 Littorina petrcea, Gray, = Z. neritoides, Linn. 



Living; absent or very local on the shores of Kent and 

 Sussex. — Forbes and Hanley, Br. Moll. vol. iii. p. 28. 

 Marks the upper tide-line on most coasts : ranges South 

 to Mediterranean, where it is very scarce {Phil.). 

 Lacuna pallidul a, Da Costa. 



Common on the British coasts. 

 Rissoa cimex, Mont. = i2. creiiulata, Mich. 



A Southern and Western species ; common about the Channel 



Islands, Spain, Portugal, and Mediterranean. 

 Has not been noticed in the Crag. 

 Rissoa reticulata, Mont.=^ R. punctur a, Mont. 



British distribution, mostly South and West ; its wider range 



has not been ascertained. 

 Mr. S. Wood identifies this as a Coralline Crag shell. It is 

 not the R. reticulata of Philippi. 

 Rissoa costata, Mont. R. exigua, Mich. 



Common on the South coast of England, becoming scarcer 

 northwards ; both in Irish Channel and German Ocean ; 

 most abundant about the Channel Islands ; common in 

 Mediterranean. 

 Not quoted from the Crag ; occurs in the marine beds of 

 Sicily and Calabria. 

 Trochus cinerarius, Linn. 



A common marginal shell ranging from high northern lati- 

 tudes to the North coast of Spain. A Red Crag species. 

 Chemnitzia elegantissima, Mont. 



On most coasts, but most abundant on the South and West 



coasts of Spain and Portugal, Mediterranean, Canaries. 

 Scarce in the CoraUine Crag ; not noticed in the Red Crag. 



Bivalves. 

 Pecten maximus, Linn. 



Along the Atlantic shores of the British Islands (Forbes and 



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