PLATE II. 

 Fio-. l. Poscilasma carinatum, n. sp. 



Kg. 1. Body taken out of the shell, with an egg-mass; magnified 6 diameters. 



Fia,s. 2-4. Prccilasma gracile, n. sp. 



Fig. 2. Animal, lateral view; magnified Gh diameters. 



Fig. 3. Labrum (/«.), with palpi (pa.); magnified 94 diameters. 



Fig. 4. Mandible; magnified 94 diameters. 



Fig. 4*. Inferior angle of the mandible; magnified 270 diameters. 



Figs. 5-9. Megalasma striatum, u. gen., n. sp. 



Fig. 5. Animal, lateral view; magnified 61 diameters. 



Fig. G. Animal, seen from the earinal side; magnified Gh diameters. 



Fig. 7. Mouth; magnified 94 diameters, la., labrum; pa., palpi; man., mandible; 



max 1 ., first maxilla; max 2 ., second maxilla. 

 Fig. 8. Mandible; magnified 63 diameters. 



Fig. 8*. Inferior angle of the mandible; magnified 200 diameters. 

 Fig. 9. First cirrus; magnified 28 diameters. 



Figs. 10-12. Dichelaspis sessilis, n. sp. 



Fig. 10. Animal, lateral view; magnified Gh diameters. 

 Fig. 11. Mandible; magnified 63 diameters. 

 Fig. 1 2. Maxilla ; magnified 63 diameters. 



Figs. 13-15. Conchoderma rir(/<ttum,\ar. chelonophilus, Leach. 



Fig. 13. Animal, lateral view; magnified 5 diameters. 



Fig. 14. Left band mandible; magnified 41 diameters. 



Fig. 15. Right hand mandible of the same animal; magnified 41 diameters. 



