224 DESCRIPTIONS OF THE BOGNOR FOSSILS. 
A species almost destitute of imbricating teeth upon the lines of growth, and 
thus approaching to Teredo. It occurs very rarely, in fossil wood at Bognor. It 
is named after my esteemed friend Captain Pechell, M.P., whose father resided 
many years at Bognor. 
Teredo. 
I have removed this genus from among the Tubicolaria, because the structure 
of the valves and boring habits of the animal are those of Pholas, and the tube 
is only a deposit of secreted matter after the passage for the animal has been 
perfected, and not present at all times. Teredina is only the fossil form of 
Teredo, the difference being the effect of a mineral deposit in the membranous ~ 
tube of the animal. (See Min. Con. vol. i. p. 231.) 
Cultellus affinis. (Tab. XIV. fig. 6.) 
This shell occurs so large and handsome at Barton as to seem a distinct species. 
Panopea Puella. (Tab. XIV. fig. 14.) 
Spec. Cuar.—Shell elliptical, slightly compressed, concentrically waved ; 
beaks almost central, prominent ; both extremities rounded. 
The beaks are mostly placed at about two-fifths of the diameter of the shell 
from the anterior extremity; in P. intermedia they vary in position, but are 
generally placed at one-third the diameter ; on the other hand, in the P. corru- 
gata they are nearer to the extremity, especially in the larger individuals. It 
may be doubtful, therefore, whether P. Puella may not be an infant state of P. 
intermedia ; its being somewhat flatter would rather favour that opinion. Mr. 
Dixon has, however, in his museum a mass with several hundred specimens not 
varying in size. 
Panopea corrugata. (Tab. II. fig. 12.) 
This shell has only lately been found at Aldwick near Bognor, in a bed of clay 
on the shore and adjacent rocks. It is more perfect at Bracklesham, and is de- 
scribed among the shells from that locality. 
Pholadomya Dixon. 
I have ventured to quote Nyst, although I have not seen an authentically- 
named specimen. 
