LAMELI.IBRANCHIA. 
185 
(Desh., Cat. moll. Reunion). H. Adams, P. Z. S., 1874, p. 585, pi. Ixix. 
fig. 3, Mauritius and Reunion. 
ASTARTIDiE. 
Astarte (Sow.). Monograph by Sowerby in Reeve’s Conchol. Icon, 
parts 318 & 319; 21 species on 3 plates. A. ahbreviata, fig. 6, locality 
unknown, semilirata^ fig. 15, and subtrigona, fig. 20, Northern Seas, and 
producta, fig. 19, Northern Europe [variety of arcfica ?], are apparently 
now. 
Astarte crebricostala (Forbes). A romarkablo palo-coloiired var. from 
E. Greenland ; Mobius, Zwoito Deutsche Nordpolarfahrt, ii. p. 252. 
Cardita aculeata (Poli) in the zone of Laminaria^ C. trapezia (Mull.) 
littoral ; Monterosato, J. de Conch, xxii. p. 252. 
UNIONIDiE. 
The development of Anodonta is the subject of a paper by W. Flem- 
ming, Arch. mikr. Anat. x. pp. 257-293, pi. xvi., and of another by Von 
Ihering, SB. Gos. Leipzig, i. pp. 3-8; the former minutely describes the 
egg in the ovary, and its first changes after fecundation, which he sup- 
poses is effected in the gills ; the latter notes the first appearance of the 
shell and the byssal gland in the mature embryo. 
S. Clessin, Mai. Bl. xxii. pp. 1-29, pi. i. figs. 1-4, discusses the generic 
characters in this family, admitting the following 16 genera: — 
1. Sub-family Unionidee] mantle open for its whole length; Unio 
(Retz), Anodonta (Guv.) [Brug.], Margaritana (Schum.), Mono- 
condylma (Orb.), Microcondylcea (Vest), typo Unio bonellii 
(Fer.), Mycetop'ns (Orb.), Byssanodonta (Orb.), Dipsas (Lea) 
[Leach], and Plagiodon (Lea). 
2. Sub-family Mutelidm ; mantle closed at the hinder extremity ; 
(Lea), type rubens (Lam.), Mutela (Scop.), type dubia 
(Gm61.), Pliodon (Conrad), Hyria (Lam.), Castalia (Orb.) [Lam.], 
and Leila (Gray). 
The liuimals of Monocondykea, Dipsas^ and Plagiodon, are unknown ; 
those of Spatha cailUaudi (Mart.) and Mutela ccelestis (Lea), distinct 
by two short siphons, are described. 
The index to Lea’s observations on the genus Unio, part iii., prepared 
by J. Lewis, contains references to the species described in vol. xiii., and 
all anatomical and structural details, habits, and other peculiarities of 
the Unionidee, contained in vols. i.-xiii. 
S. Clessin has observed that the dark girdles on the shells of Unio and 
Anodonta are really annual marks, as the animals are not quite inactive 
in winter, whep they secrete epidermal [cuticular], but no calcareous, 
matter on the edge of the shell. Nachr. mal. Ges. 1874, pp. 25-29. 
Anodonta. S. Clessin, in the 2nd edition of the conchological work of 
Martini and Chemnitz, has published two further parts (Nos. 67 & 68, 
containing descriptions and figures of 87 species, pp. 63-152, pis. xvi.-li.) of 
