PACHYBATHRON. 283 



Unfigured Species of Oniscia. 



(). (JiiANDis, A. Ad. (perhaps = exquisita). China Sea. 



O. CITIIARA, Watson. Ke Islands, W. of Papua. 



0. LAMAKCKII, Lesson. Australia. 



Genus PACHYBATHRON, Gaskoin, 1853. 

 P. CASSIDIFORME, Gaskoin. PL 8, figs. 1-3. 



White, with three ash-colored bands, longitudinally plicately 

 striate, whorls ridged around the suture. Length, 6 mill. 



Is. of St. Vincent, Bonaire, Curapoa, West Indies. 



P. MARGINELLOIDEUM, Gaskoin. PL 8, figs. 4, 5. 



Yellowish white, with three or four spiral rows of chestnut- 

 colored sagittate markings ; whorls smooth at the suture, chest- 

 nut margined. Length, 5 mill. 



West Indies. 



In Chen u 's "Manuel" the names of the species illustrated 

 have been transposed. 



