PLATE 56. 



Tripocyrteda, Anthocyrtida et Sethocyrtida. 



Diam. Page 



Fig. 1. Lithomelissa biitschlii, n. sp. (vel Sethomelissa biitschlii), . x 400 1207 



Fig. 2. Lithomelissa decacantha,n. sp. (vel Sethomelissa decacantha), x 400 1208 



Fig. 3. Psilomelissa calvata, n. sp., . . . x 400 1209 



The cephalis alone, with the three collar beams. 



Fig. 4. Lychnodictyum scaphopodium, n. sp., . . . x 400 1231 



Fig. 5. Sethophormis pentalactis,n. sp. (vel Pentaphormispentalactis), x 400 1244 

 Oblique view of the shell, from below. 



Fig. 6. Sethophormis hexalactis,n. sp. (vel Hexaphormis hexalactis), x 400 1245 



Central part of the shell, with the cortinar septum. 



Fig. 7. Sethopyramis enneactis, n. sp. (vel Cephalopyramis enneactis), x 400 1254 



Fig. 8. Plectopyramis polypleura,n.$$. (vel Sethopyramis polypleura), x 200 1260 



Fig. 9. Sethophormis eupilium, n. sp. (vel Craspedilium eupilium), x 400 1247 



Fig. 10. Plectopyramis spongiosa,n.s]p.(ve\ Spongopyramis spongiosa), x 400 1261 



Fig. 11. Arachnocorys araneosa, n. sp., . . . . x 500 1266 



Fig. 12. Sethophormis dodecaster,n. sp. (vel Astrophormis dodecaster), x 200 1248 



Fig. 13. Sethocephalus eucecryphalus, n. sp., . . . x 400 1298 



