Plate XVIII. 



Fig. I. Valve of a trideutate pedicellaria of Echimis acntus, var. norvegicus, from the side. Obj. II. Oc. 1. 



2. — globiferous — - — elegans^ from the inside. Obj. II. Oc. I. 



_ 3. _ _ _ — - — — . . side. Obj. II. Oc. I. 



— 4. Tridentate pedicellaria of Echimis affinis. Obj. o. Oc. o. 



— ^. — — - — ncutns. Obj. o. Oc. o. 



— 6. Valve of a globiferous pedicellaria of Echiims acutiis, from the side. Obj. II. Oc. I. 



7. — tridentate — - — — var. )iorvcgicus^ from the inside. Obj. II. 



Oc. I. 



— 8. Spicules of Ecliimix i/zrlo. Obj. V. Oc. I. 



— 9. Valve of a globiferons pedicellaria of Echinits Alcxaiidri (The t>pe-specimen). Obj. II. Oc. o. 

 10. — — — — - — gracilis. Obj. II. Oc. I. 



_ II. _ _ — _ - — Alcxaiidri. Obj. II. Oc. I. 



— 12. Spicules of Echimis csculentus. Obj. V. Oc. I. 



— 13. Valve of a tridentate pedicellaria, small form, of Echi/nis cscnlci/tiis. Obj. II. Oc. o. 



— 14. Spicules of Echimis acutiis., var. Flemiiigii. Obj. V. Oc. I. 



— 15. Valve of a tridentate pedicellaria, small form, of Echimis gracilis. Obj. II. Oc. I. 



of Echimis a/finis. Obj. II. Oc. I. 



— - — atlanticus. Obj. II. Oc. o. 



— - — viclo. Obj. II. Oc. o. 



— - — Alcxaiidri (type-specimen). Obj. II. Oc. I. 



— - — csculentus. Obj. II. Oc. o. 



— - — gracilis^ large form. Obj. II. Oc. o. 



— - — elcgans^ from the inside. Obj. II. Oc. o. 

 _ 23. — — — - — Alexandria from the inside. Obj. o. Oc. I. 



— 24. Globiferous pedicellaria of Echimis acutus, var. norvegicus. Obj. o. Oc. I. 



— 25. Valve of a tridentate pedicellaria of Echimis Alexandri, from the side. Obj. II. Oc. I. 

 26. — — - — elegans^ from the side. Obj. II. Oc. I. 



27. — — - — lucidiis. Obj. II. Oc. I. 



28. — — — - — affinis. Obj. o. Oc. I. 



