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Show 490 MESSRS. BAIRD AND ADAMS ON CHINESE SHELLS. [May 9, lection, there are several species which deserve some special notice, besides two or three which appear to be undescribed. 1st. Unio douglasice. In 1833 Dr. Gray shortly described and accurately figured, in the twelfth volume of Griffith's edition of Cuvier's 'Animal Kingdom,' a species of Unio which he calls Unio douglasice. The type specimen of this shell has always been, and still remains, in the collection of shells in the British Museum. Dr. Lamprey has brought a considerable series of this Unio, which seems to be not uncommon in the neighbourhood of Shanghai. Perhaps from not knowing the shell as figured in Griffith, Mr. Lea some years afterwards described and figured a species from China, which he named Unio murchisonianus, but which, there is no doubt, is the same as the U. douglasice of Gray. Still later, in the seventh volume of his ' Observations on the genus Unio,'' he describes and figures a species from Shanghai, which he calls U. shanghaiensis. A careful examination of the description and figures of the two last-named species, with the type specimen of that described and figured by Dr. Gray in Griffith's 'Animal Kingdom,' satisfies us that the three species are identical. The name U. douglasice must therefore stand, having the precedence over the others by some years. 2nd. Anodonta tenuis. Another species of the family Unionidce, brought by Dr. Lamprey, appears to be the U. tenuis of Gray, figured also in Griffith's 'Animal Kingdom.' In the list of the figures of shells at the end of the twelfth volume of that work this shell appears twice, first under the name of Anodon tenuis, and secondly under that of Unio tenuis. An examination of the specimens brought by Dr. Lamprey shows that this species belongs more correctly to the genus Anodonta than to Unio, as no trace ot teeth is to be seen in it. A reference to the figure will also demonstrate this; and this shell, therefore, though denominated in the plate Unio tenuis, must be now, as indicated in the letterpress, called Anodonta tenuis. From there being no lengthened diagnosis given with the figures, these two last-named species are but little known under their original names. 3rd. Glauconomya primeana 1 Two apparently distinct species of Glauconomya are in the collection of Dr. Lamprey. One of these appears to resemble somewhat the G.-chinensis of Gray ; and the other more nearly approaches to one lately described and figured in the third volume of the third series of the ' Journal Conchyliologique,' by M M . Crosse and Debeaux, under the name of G. primeana. Several specimens of these shells occur; and it is possible they may all be referred to this species, though they differ in some respects from the figure given in the above-mentioned work. 4th. Anodonta gibba. A very interesting series also occurs of the Anodonta gibba of Cantor and Benson, which shows how considerably this species varies according to age. When adult it is much more rounded, and appears shorter than the younger specimens. 5th. Nanina rav'ida. A very interesting series of a species of Nanina was also brought by Dr. Lamprey. Several specimens undoubtedly represent the Nanina ravida of Benson, have a tolerably |