— 147 — 
Transactions American philosophical Sociely; New 
Series ; III, p. 403-457, pl VII -XIV (coloriées). 
Ces parties A et B réunies ont été imprimées à part 
sous le titre : 
4). Observations | on | the Genus Unio, | together with 
| Descriptions | of | Eighteen New Species; and of 
the Genus Symphy — | nota, new separated from 
the family of | Naïades, containing nine species. 
Philadelphia : | Printed by James Kay, Jun. & Co. | 
1829, gr. in-4°; p. 71, pl. III-XIV (coloriées). 
C). Observations on the Naïades, and Descriptions of 
New Species of that and other Families. 
Transactions American philosophical Sociely; New 
Series ; IV, p. 63-105 [ 7 Mai 1830 ] et p. 105-121 [ 20 
Mai 1831 |, pl. HI -XVIIT coloriées. 
D). Description of a new Genus of the family Melaniana 
of Lamarck. 
Transactions American philosophical Society; New 
Series; IV, 1631,.p: 122-123. 
Ce sont les parties x, C et D qui réunies, constituent le 
premier fascicule du vol. I. Ce fascicule à paru séparément 
sous le titre : 
Observations | on | the Genus Unio, | together with | 
Descriptions | of | New Genera and Species in the Families 
Naïades, | Melaniana and Colimacea. | | Read before the 
Am. | Philos. Society in 1827, 1829 and 1831, and publi- 
shed in | their Transactions in vols. II and IV, N.S. | 
By Isaac Lea, | member of the American Philosophical 
Society, of the Academy of Natural Sci — | ences of 
Philadelphia, of the Lyceum of Natural History of New- 
York, | of the Royal Physical Society of Edinburgh, of 
the Natural | History Society of Montréal, corresponding 
member | of the Linnean Society of Bordeaux... 
Philadelphie : | Printed by James Kay, Jun. & Co. | 
