" 60 Russell's Familiar Notice of some of the 



UNIO RADIATUS. Say. Latin, rayed. (Minding io the green 

 markings on the epidermis.) 



Another very beautiful native species, elegantly striped with 

 transverse rays of dark green, some broader than others : upon 

 a lighter green epidermis ; within bluish pearl. 



Flax Pond, Lynn, Dr. Prescott . 



Cabinet of Dr. Prescott and of the Society. 



UNIO NASUTUS (Say.) Latin, beaked, (alluding to its elon- 

 gated and sharp form.) 



A fine, delicate shell ; compressed, fuscous without, within 

 bluish white, teeth crenate : more or less distinctly radiated. 



Described in Nicholson's Encyclop., 3d Am. Ed. Phil., 1819. 

 vol. iv., article " Conchology," with an accompanying figure. 



Obs. The specimens from the Hudson's River, N. Y. are 

 usually bluish within or slightly tending to purple, but speci- 

 mens from our own ponds are very beautifully and deeply purple, 

 and very dusky without. Mr. Conrad, in a little work published 

 in 1834, mentions the fact that this species is purple, as occur- 

 ing in the Schuylkill. Pa., and also in Chester River, Md. 



Pound in Flax Pond, Lynn, by Dr. Prescott. 



His Cabinet and Cabinet of the Society. 



ANADONTA. Greek. Destitute of teeth. 

 CATARACTA. Latin, belonging to streams. 

 Common in ponds and still ditches in this vicinity. Light 

 green, very fragile and beautiful, six or more inches in length. 

 Sometimes found in the Reservoir of the Aqueduct, at Tapley's 

 Brook. 



Nicholson's Encyclopaedia, vol. iv. plate. 



ANADONTA. 



IMPLICATA. Say. (No obvious meaning.) 

 Shell thin, elongated, somewhat beaked, very dark brown 

 without, pearly within ; common in ponds of Essex County. 



