156 



Striatum. Dentalium Dentalis. Lin. Trans, vlii, p. 237. 



p. 495. 



This may poflibly be the Linnean Dentalis. 



SfiRPULA and Vermiculum. 

 General Observations, 



In thefe intricate clafles of Tejlacea we have not negle6led 

 any opportunity where there was the fmalleft profpedl of 

 elucidating the fubjedl, but we find it fo extremely difficult 

 to fatrsfa^torily define feveral of the irregular divifions of 

 thefc genera, that a few general remarks are all that we fhall 

 venture to add, except one new fpccies of chambered Serpula. 



As far as thefe genera have been communicated to the 

 public in Tejlacea Britannka there has not appeared any 

 reafon to induce us to change our opinion : but it fhould be 

 remarked that in examining a great number ofSerpu/a, many 

 that were in appearance triqiietra were found to be inhabited 

 by animals fo extremely different in that part ufiiaily termed 

 the probolcis, as to warrant a conclufion that they are ac- 

 tually diftin6l ; but as it is utterly imj)oflible to perceive 

 the fmallefi diftinrtion in the (hells, we fliall briefly remark 

 that, befides the triquetra, (the animal of which has been de- 

 fcribed to poflefs a ftriated membranaceous termination to 

 its probofcis ) there are four others ellentially difierent in 

 that part : — 



I. 



