Tafel XIII. 



1. LacuDa (Ebora) crassilabris Conr. sp. 



2 — 3. Lac. (Ebora) bella Conr. sp. 



4 — 7. Hydrobia (Isaea) confusa Bttg. n. sp. 



8 — 9. Hydr. (Isaea) Ortoni Gabb. sp. 



10—11. Hydr. (Isaea) tricarinata Bttg. n. sp. 



12. Hydr. (Isaea) protea Goul d sp. lebend. 



13. Turbonilla minuscula Gabb. 



14 — 15. Pseudolacuna macroptera Bttg. n. sp. 



16 — 18. Dreissena fragilis Bttg. n. sp. 



19 — 21 Anisotbyris amazonensis Gabb. sp. 



7 — 22. Anis, tenuis Gabb. sp. 



