NEW FRESH WATER AND LAND SHELLS. 



231 



attachment with figures. He had communicated the fact of his observations 

 to me by letter several years before, and I then informed him that I had in a 

 single instance some years before observed it in the Schuylkill. 



The following tabular view and- notes form the matter digested by my brother, 

 from his extensive notes during the years 1838, '39, and '40, mentioned above. 



No. 1. 

 No ova found in the 

 oviducts. Theovarianot 

 examined except in Unio 

 ^sopus, which had ova 

 in the ovarium. Exa- 

 mined in the Autumn of 

 1838. 



Specimens. 

 Unio TEsopus, 1 



varicosus, 16 



metanever, '26 

 cornutus, 40 



cylindricus, 18 

 cuneatus, 20 



glbbosus, 19 



sulcatus, 25 



pileus, 7 



triangularis, 5 

 pustulatus, 5 



pustulosus, 18 

 asperrimus, 19 

 tuberculatus, 7 

 trigonus, 6 



elegans, 12 



formosusj 9 



ebeuus, 14 



fragosus, 15 



Cooperianus, 40 

 monodontus, 7 

 verrucosus, 7 



undatus, and ) 

 pyramidatus, ) 30 



lachrymosus, 5 

 dehiscens, 7 



plicatus, 8 



-*No. 2. 



Ova in the ovarium in 

 the Autumn of 1839. 



U. cylindricus, 6 



pyramidatus, 2 



undatus, 5 



varicosus, 2 



tuberculatus, 3 



gibbosus, 2 



pustulosus, 7 



pustulatus, 3 



cornutus, 6 



asperrimus, 3 



plicatus, 1 



metanever, 1 



cuneatus, 2 



.ffisopus, 2 



In March, 1840. 



U. parvus, 10 



lachrymosus, 7 



In July. 

 U. rubiginosus,* 1 



* Six others of this 

 species, taken at the 

 same time, had ova in the 

 oviducts. See column. 

 No. 4, 



No. 3. 

 Ova in the oviducts in 



the Autumn of 1838. 



U. perplexus, 16 



foliatus, 18 



irroratus, 12 



retusus, 7 



securis, 8 



phaseolus, 8 



ovatus, 1 



gracilis, 3 



alatus, 1 



Isevissimus, 4 



tenuissimus, 5 



ridibundus, 3 



ellipsis, 4 



circulus, 1 



crassus, 7 



rectus, 1 



personatus, 1 



multiplicatus, 4 



occidens, 3 



compressus, 1 



camelus, 4 



orbiculatus, 3 



mnltiradiatus, 1 



Marg.complanata, 1 



rugosa, 2 



An, edentula, 6 



Ferussaciana, 4 



In Autumn, 1839. 



U. Isevissimus, 2 



multiplicatus, 1 



alatus, 1 



VIII. — 3 I 



No. 4. 

 Ova in the oviducts, 

 at various dates in 1840. 



March. 



U. circulus, 1 



occidens, 4 



compressus, 10 



luteolus 11 



tenuissimus, 1 



Marg-rugosa, 1 



calceola, 1 



complanata, 2 



An. Wardiana, 2 



incerta, 2 



May 16. 



U. lachrymosus, 2 



Some minute ova were 



also found in the ovaria 



of these two specimens. 



July and August. 



U. plicatus, 1 



patulus, 5 



rubiginosus, 6 



multiradiatus, 2 



fabalis, 1 



circulus, 1 



gibbosus, 1 



luteolus, 1 



An. plana, 2 



Sept. 5th. 

 U. compressus, 2 



rectus. 



3 



Oct. 12th. 





plicatus, 



3 



U. occidens, 



4 



crassus, 



1 



luteolus, 



2 



ovatus. 



1 



Marg. rugosa, 



1 



. plana. 



21 



An. edentula. 



1 



incerta, 



3 



Ferussaciana, 



2 



