392 ACCOUNT OF 



Mytilus. 



3. pellucidus. P. D. M. Leith Roads. The fisher- 



men at Newhaven dredge 

 these in great quantities 

 for bait ; and it appears 

 remarkable, that few of 

 the common muscle are 

 found amongst them. 



4. modiolus. lam perfectly convinced, by 

 curtus, and > P. M. D. strict observation and com- 

 umbilicatus. J parison, that those three 



" distinct species," as they 

 have been denominated by 

 authors, are but one and 

 the same for instance, 

 curtus is the fry, and mo- 

 dio'u.s the full grown shelL 

 I possess in my cabinet a 

 series of above sixty spe- 

 cimens, from the size of a 

 turnip seed to a full gi own 

 shell of above nine inches 

 in length ; from whence I 

 draw my reasons. In re- 

 spect to umbilic Jus, I am 

 further convinced of its 

 being a 1usl»s. proceeding 

 from accident or other- 

 wise, as, within these few 

 days, I have met with two 

 specimens on the shore of 

 Aberlady Bay, which have 

 begun to iorm an umbili-, 

 cation, and one has pro- 

 ceeded so far, as to entitle 

 it fully to its name. 



