78 PHOLAS. 



merly grew there, but which are now covered with the 

 tide except at very low water. The shell varies in size, 

 and measures from one inch to six from end to end. 

 The specimen figured in the centre of plate 13. is very 

 perfect, and measures five inches and a half. It was 

 found with several others at the mouth of Kingsbridge 

 river, in Devonshire. 



The best figure of the Pholas Dactylus is by Pen- 

 nant. Born's figure is very good, and so is Lister's, but 

 rather too strongly beaked. Gualtieri has evidently in- 

 tended to figure the shell, but his subject must have 

 been worn and without teeth. 



INDIAN PIERCER. 

 PL 14./. 1, 2. Dr. Coombe. 



2. Pholas orientalis. Ph. testa oblonga, margine recto; altera parte 

 glaberrima, altera reticulato-striata. Linn. Gmel. p. 3216. 



Shell oblong with a straight margin ; one half quite smooth, the other 

 with reticulated striae. 



Pholas India; Orientalis, testa oblonga, fragili, pellucida, supra dimi- 

 dium reticufatim seu decussation striata; striis nodulosis prominulis, 

 dorso et umbone tribus valvulis succenturiatis supertecto. Chemn. 

 Conch. 8. p. 356. t. 101. f. 860. 



List. Conch, t 431. f. 247. Walch. Naturf. 13. p. 86. t. 3. f. 15. En- 

 cyclop. Method, pi. 168. f. ]0. 



A very fragile white shell, of a long narrow shape, 

 and strongly striated on the anterior half, the other end 

 perfectly smooth; the striae terminate abruptly. The 

 back of the shell, when perfect, is covered at the hinge 

 with a single oblong valve, resembling a patella. There 

 is a strong tooth on the inside of each valve. The 

 shell gapes much at one end, but is nearly closed at 

 the other. 



