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XXX. Some Account of the Spiral Tubes or Ligaments in the Genus 

 Terehratula of Lamarck, as observed in several Species of Fossil 

 Shells. By Mr. James Sowerby, F.L.S. 



Read December 6, 1814; and February 7, 1815. 



I HAVE the honour of submitting to the Linnean Society a sketch, 

 showing the general construction with the extraordinary spiral 

 and perhaps originally cartilaginous tubes of a certain division of 

 the o-enus Anomia of Linnaeus, or Terehratula of Lamarck. The 

 Anomia striata of Martyn is represented at Fig. 2. (Tab. XXVIIL), 

 having its triangular aperture between the beaks, which is charac- 

 teristic of the division. In this species the side of the spiral tube 

 is of a darker colour than the crystallized carbonate of lime which 

 fills the shell, the whole being limestone. It is probable that 

 these peculiar constructions may give characters to new genera, 

 of which many species are found in England, France, Ireland, 

 and even in New Holland, imbedded in limestone, flint, chert, 

 or sandstone. In a specimen brought from New Holland by 

 Mr. Brown, one only of the spiral tubes is to be seen ; and it was 

 not known positively that the shell ought to have two, until, a 

 short time since, I discovered in my collection a complete speci- 

 men, from which Fig. 1. is taken. 



Fig. 1. 



