PLATE XXVI 



Fig. i — 16. Hexelasma velutinum n. gen. n. sp. 



Fig. I. Shell, cylindrical form, lateral view; magnified 4 diameters. 



a and b, scutum and tergum, internal view; magnified 5,6 diameters. 



c and d, scutum and tergum of the specimen of Fig. 1, external view; magnified 5,6 

 diameters. 



Shell, conical form, lateral view; magnified 4 diameters. 



Same specimen seen from above; magnified 4 diameters. 



a and b, scutum and tergum, internal view; magnified 5,6 diameters. 



c and d, scutum and tergum of the specimen of fig. 3 and 4, external view ; magnified 

 5,6 diameters. 



Rostrum, internal view; magnified 5,2 diameters. 



Labrum, central part, with right-hand palpus; magnified 144 diameters. 

 Fig. 8. Labrum with palpi ; magnified 44,5 diameters. 



Fig. 9. Triangular shield-formed central part of labrum ; magnified 44,5 diameters. 

 Fig. 10. Part of border of labrum; magnified 206,5 diameters. 

 Fig. 11. Mandible; magnified 44,5 diameters. 



Fig. 11*. Inferior angle of mandible of other specimen; magnified 206,5 diameters. 

 Fig. 12. Maxilla ; magnified 44,5 diameters. 



Fig. 12*. Edge of maxilla of other specimen; magnified 144 diameters. 

 Fig. 13. Outer maxillae; magnified 44,5 diameters. 



Fig. 14. Sixth cirrus, one of the middle segments; magnified 44,5 diameters. 

 Fig. 15. Penis and lower segment of pedicel of sixth cirrus; magnified 44,5 diameters. 

 Fig. 16. Sixth cirrus and penis, to show the size of the latter; magnified 10 diameters. 



