472 



When aliveit is frequently corneous, orblacklfl, fpot- 

 ted with white, as defcribed by Gmei.in: fucii are 

 now before us, but can only be confidered as one of the 

 numerous varieties xht Jluviatilis is fubje6l to. 



5. 



PEtLUCiDA. ^* *^^^ ^^^'' pellucida, anfraclibus tribus. Lin. Trans, iil. 



p. 67 (Adams ) 



Shell fmooth pellucid, with three whorls, Pembroke- 

 JJiire coafl. Turt. Lin. iv. p. 550. 



^LBA. N. tefla lasvi fub-pellucida, duobus anfracVibus. Z./ff. Trans. 



«. iii. p. 67. (Adams.) 



Shell fmooth fub-pellucid, wiih two whorls. Pem- 

 Irokejhire coaft. Turt. Lin. iv. p. 550. 



Thefe two minute fpecies we have given on the autho- 

 rity of Mr. Adams : at the fame time think it proper to 

 remark, that there does not appear any diflinguifhing 

 charafter; for if (hells are to be feparated by being a 

 little more or lefs pellucid, or by one fpire more or lefs, 

 t fpecies would be multiplied without end. At the fame 



time we are inclined to give Mr. Adams credit, yet in 

 many inftances we confider he has miftaken the fry of 

 fome, for dilHn6l fpecies ; and fufpccl in thefe two in- 

 ftances the young of Nerita glaucina may be referred 

 to : fuch are not uncommon amongft fand on many of 

 our fliores. 



GEN. 



