AN INTRODUCTION 



LA MARCK's CONCHOLOGY. 



ARENICOLA. 

 lumbricius marinus. — Linnceus. 

 Ency.pl 34, / 13. 

 AN Annelides said to inhabit a tubular shell; but the 

 animal only has been seen by La Marck. A descrip- 

 tion of this animal is given in the Synoptic Table. 

 Arenicola piscatorium. 



ifl^ft- 



SIL1QUARIA. 



SERPULA ANGUINA. LinnCBUS. 



Martini, jig. 13, c. tab. 2, t.\ 

 This was considered a serpula by Linnaeus; but the 

 distinctions are sufficiently marked to constitute a se- 

 parate genus. Shell tubular, irregularly twisted, some- 

 times in a spiral form at the base, open at the upper 



