LASEIDjE. 



473 



Species of Mysia. 



alata, Adams and Reeve. 

 Americana, Morel. 

 apicalis, Phil. 

 Brasiliensis, Phil. 

 caelata, Reeve. 

 calculus, Reeve. 

 circularis, Dkr. 

 Coreensis, Adams and Reeve. 

 Cumingii, Sow. 

 globularis, Lam. 

 granulosa, Dkr. 

 Gruneri, Dkr. 

 inconspicua, Phil. 

 Indica, Desh. 

 Jaueirensis, Reeve. 



leucoplueota, Reeve. 

 lupiua, Brocchi. 

 Moretonensis, Desh. 

 Novo-Zelandica, Reeve. 

 oblonga, Sow. 

 Philippiuarum, Sow. 

 pisiformis, Desh. 

 rotuudata, Tiirton. 

 semiaspera, Phil. 

 Senegaleusis, Reeve. 

 sphsericula, Desh. 

 subglobosa, C. B. Adams. 

 subrugosa, Dkr. 

 trigouula, Brown. 

 Venezuelensis, Dkr. 



Sub-gen. felania, Recluz. 



Shell sub-lenticular, thin, covered with an epidermis ; a 

 small lunule. Pallial impression with a short, triangular 

 sinus. 



cornea, Reeve. 

 diaphana, Gmel. 

 friabilis, Reeve. 

 nitens, Reeve. 



rosea, Recluz. 

 sericata, Reeve. 

 tellinoides, Reeve. 



Fam. LASEIDiE. 



Mantle with only one siphonal opening, the anal, which 

 is sometimes sessile, sometimes produced into a tube ; the 

 mantle folded anteriorly into a canal or tube. Foot ligu- 

 late, grooved, with a byssiferous organ, and capable of being- 

 used as a creeping disk. 



