158 SHELLS FROM THE MOLUCCAS. 
29, Neritina (Neritodryas) cornea Linn. 
Martens, 1. c. p. 140, pl. 12, figs. 14—18. 
One specimen, collected along with the preceding species. 
Prof. v. Martens has not recorded it from Ceram, 
30. Septaria suborbicularis Sow. 
Martens, in Martini-Chemn. 2d ed. Mon. Navicella, p. 
31, pl. 6, figs. 5—14. 
Many specimens from a brook at the southern coast of 
Leitimor near Ema, Amboyna, collected by Martin; a 
few belong to the subvariety furcato-radiata Martens. 
31. Cyrena coazans (Gmel.) Martens. 
The distinction of the species in the genus Cyrena is 
so very difficult, that I was obliged to ask the assistance of 
Prof. v. Martens, who informed me that the present species is 
identical with that, which is named C. cyprinoides Quoy 
& Gaimard in the Berlin Museum and also in Malak, Blat- 
ter, X, 1863, p. 130, and figured by Reeve, Conch. 
Iconica, Mon. Cyrena, pl. 7, fig. 24, under the name of 
cyprinoides, but that on comparison with the original figure 
in the » Voyage de |’Astrolabe”, it is doubtful whether it be 
the same species, this figure being more angulate behind ; 
that it is, however, without doubt the species described by 
Rumphius as Chama lutaria et coavans, called Venus coaxans 
by Gmelin, and that it should therefore be named Cyrena 
coarans, though Gmelin has confounded it with C. ceylonica 
Chemn. In consequence the synonymy should be: 
Cyrena coazans (Gmel. sp. pars) Martens. 
>  cyprinoides Martens (olim) non Quoy & Gaimard. 
> > Reeve, fig. 24. 
One specimen has slight divaricating plicae on the epi- 
dermis of the posterior part, calling in mind C. divari- 
cata. After comparison of the figure of Reeve, they seem 
Notes from the Leyden Museum, Vol. XV. 
