THE NAUTILUS. 



I append a list of the 



Unio multiplicatus Lea. 

 plicatus LeS. 

 anodoutoides Lea. 

 rectus Lara, 

 gracilis Barnes, 

 alatus Say. 

 pustulosus Lea. 

 tuberculatus Barnes, 

 metanevrus Raf. 

 trigonus Lea. 

 coccineus Lea. 

 fragosus Cond. 

 verrucosus Barnes, 

 parvus Barnes, 

 occidens Lea. 

 gibbosus Barnes, 

 laevissimus Lea. 

 asperrimus Lea. 



mollusks that I have found to date. 



Unio ventricosus Barnes. 



luteslus Lam. 



ligaraentinus Lam. 



lacrymosus Lea. 



cornutus Barnes. 



elegans Lea. 



zigzag Lea. 

 Marg. rugosa Barnes. 



complanata Barnes. 

 Anodonta grandis Say. 

 edentula Say. 

 plana Lea. 

 Paludina Integra Say. 

 Physa heterostropha Say. 

 Somatogyrus subglobosus Say. 

 Sphserium solidulum Piinie. 

 Pleurocera lewisii Lea. 



LOCAL VARIATION. 



BY REV. HENRY W. WINKLEY. 



A good title for nature would be " Unity differentiated," and the 

 words may be used not only of the whole, but of any part. Take 

 as examples, the cell with its modifications, the class mollusca 

 and its species, (an excellent comment on the variations as contribu- 

 ted by Mr. Chas. T. Simpson, to the February Nautilus and 

 reminds the writer of a few which are noted below.) 



A large continent is a grand field for the evolution of many varie- 

 ties. Yet small areas often afford excellent examples of local varia- 

 tion. I mention a few as seen in this State. 



Examples of Fustis Islandicus Gmel., from Eastport, Old 

 Orchard or the Sheepscote now are before me. Specimens with 

 about the same number of whorls vary greatly in size, being 3, 

 82, and I2 inches respectively. The color variations are also 

 marked. 



