Tiie Vbv-£L§e of H.M. t? . "Ciialleii-ger " 



OrtUolites Pl.V, 





We et ile-v«aaii &- C*? imp 



Geo West Jr. iith. a.d na.t, 



FIG? 1-10. ORBITOLITES DUPLEX. FIG^ 11-18, O C O M PL AN ATA . 



