Fig. i 



Plate XII. 



Valve of trideutate pedicellaria of Phormosoma barsarium. Obj. II. Oc. I. 



2. — - * - placenta, from the Davis Strait. Obj. II. Oc. o. 



3. — - - — the Gulf of Mexico. Obj. II. Oc.o. 



4. Developmental stage of a large trideutate pedicellaria of Phormosoma placenta. Obj. II. Oc. o. 



5. Valve of a half developed — — - — Obj. II. Oc. o. 



6. — — trideutate pedicellaria of Phormosoma rigidum. Obj. II. Oc. I. 



7. — — - placenta (Ingolf. St. 40). Obj. II. Oc. o. 



8 — 10. Transverse sections of the head of a globiferous pedicellaria of Hapalosoma pellncidum 

 8. nearest to the basis, 10. in the middle, 9. at the point. Obj. II. Oc. III. 



11. Actinal primary spine of Phormosoma placeiita, the bag of skin removed. Obj. 00. Oc.o. 



12. Valve of a triphyllous pedicellaria of Kamptosoma asterias. Obj. II. Oc. III. 



13. - v.Asthenos. gracile* (Chall. St. 219). Obj II. Oc. III. 



14. - Hapalosoma pellncidum. Obj. II. Oc. III. 



15. Developmental stage of a triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



16. Valve of a triphyllous pedicellaria of Aperosoma Grimaldii. Obj. II. Oc. I. 



17. — — - Echinosoma uranus. Obj. II. Oc. I. 



18. - Asthenosoma variuiu. Obj. II. Oc. III. 



19. Spine from the peristome of Phormosoma placenta; with bag of skin. Obj. o. Oc.o. 



20. Valve of a triphyllous pedicellaria of Hygrosoma luculentum. Obj. II. Oc. I. 



21. — — — - Phormosoma placenta. Obj II. Oc. I. 



22. — tridentate small form, of Tromikosoma Koehleri. Obj. II. Oc. o. 



23. Sph?eridia of Phormosoma placenta. Obj. II. Oc. I. 



24. Developmental stage of a triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



25. Sphneridia of Phormosoma placenta. Obj. II. Oc. I. 



26. Valve of a small tridentate pedicellaria of Phormosoma placenta. Obj. II. Oc. o. 



27. — triphyllous pedicellaria of Arazosoma coriaceum. Obj. II. Oc. I. 



28. - Phormosoma bursarinm. Obj. II. Oc. I. 



29. - Arazosoma Belli. Obj. II. Oc. I. 



30. Developmental stage of a triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



31. Valve of a triphyllous pedicellaria of Tromikosoma Koehleri. Obj. II. Oc. I. 



32. - Kamptosoma asterias (< Phormosoma tenue», Chall. St. 272). 

 Obj. II. Oc. III. 



33. Valve of a triphyllous - Arazosoma fenestratum. Obj. II. Oc. I. 



34. — — — - Calveria hystrix. Obj. II. Oc. III. 



35. large tridentate pedicellaria of Echinosoma tenue, seen half from the side. Obj.o. Oc. o. 



36. — tridentate - uramis. Obj. II. Oc. I. 



37 and 39. Valve of a small tridentate pedicellaria of Phormosoma place?ita. Obj. II. Oc. o. The 

 edge finely serrate, which cannot be seen under the magnifying powers used in the drawing. 



38. Valve of a half developed triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



40. — small tridentate pedicellaria of Echinosoma tenue. Obj. II. Oc. o. 



41. large - Tromikosoma Koehleri. Obj. o. Oc. o. 



42. — triphyllous pedicellaria of Hygrosoma Petersii. Obj. II. Oc. I. 



