8422 Mollusks. 



Unionidae are abundant further out, where the current is most rapid, 

 and the water about knee-deep, two-thirds of the shell being buried 

 in the gravel. We wade slowly for some time, feeling with our hands 

 along the bottom for the points of the shells. 



During a month's stay at Waynesville, in the most favourable part 

 of the year, we found the following fresh-water shells in the Little 

 Miami River, within a mile or two of the town : — 



Anodonta plana, Lea Unio siliquoidens, Barnes 



„ edeutula, Say „ alasmodontinus, Barnes 



„ irnbecilis, Say (U. pressus, Lea) 



Margaritana (Alasmodon)rugosa, Barnes * „ fasciolus, Raf. 



* „ „ truncata, Say (U. multiradiatus, Lea) 



* „ „ calceola, Lea * „ fasciolaris, Raf. 

 *Unio costatus, Rajinesque (U. phaseolus, Hildreth) 



(U. undulatus, Barnes) * „ parvus, Barnes 



* „ flavus, Raf. * „ subrotundatus, Raf. 

 (U. rubiginosus, Lea) (U. circulus, Lea) 



„ cavdium, Raf. * „ tuberculatus, Raf. 



(U. ventricosus, Barnes (U. verrucosus, Barnes) 



U. subovatus, Lea Sphaeriuin (Cyclas) solidulum, Prime 



U. occidens, Lea, female var.P) Pisidiuin virginicum, Bgt. 



* „ triqueter, Raf. (Cyclas dubia, Say) 



(U. triangularis, Say) Paludina integra, Say (and reversed 



* „ clavus, Lamarck variety) 



„ rectus, Lamarck *Melania depygis, Say 



* „ lapillus, Say Planorbis trivolvis, Say 

 „ dilatatus, Raf. Phvsa heterostropha, Say 

 (U. gibbosus, Barnes) Aucylus (undetermined) 



Of these twenty-seven shells about half are purety western species, 

 and do not extend far north (say not so far as the 43rd or 44th degree 

 of N. latitude) or east of the Alleghany Mountains ; to these an asterisk 

 is prefixed. All the rest (save Anodonta imbecilis and Paludina integra) 

 occur as far north and east as Lower Canada, for example, and, the 

 two species excepted, have been found so far north in the state of New 

 York, that it is not unlikely they may exist in the "Eastern town- 

 ships" of Lower Canada. 



But we are again digressing. During the wading we have been 

 silently watching the proceedings of two musk rats, as they leisurely 

 swim across the stream. Three red-headed woodpeckers {Melanerpes 

 erythrocephalm), two males and one female, are investigating some 

 rotten plane trees on the opposite side of the river. A belted king- 

 fisher (Ceryle Alcyon) perches on a dead tree : suddenly we hear a 



