Plate XII. 



Fig. i. Valve of tridentate pedicellaria of Phormosoma bursarium. Obj. II. Oc. I. 



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



3. - the Gulf of Mexico. Obj.II. Oco. 



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



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

 6. tridentate 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 pellucidTim 



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



ii. Actinal primary spine of Phormosoma placenta, the bag of skin removed. Obj. oo. Oc. o. 



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



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



14. - Hapalosoma pellucidum. 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 Tiramis. Obj. II. Oc. I. 



18. - Asthenosoma vartum. 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 hiculentum. Obj. II. Oc. I. 



- 2i. - Phormosoma placenta. Obj II. Oc. I. 



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



23. Sphaeridia of Phormosoma placenta. Obj. II. Oc. I. 



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



- 25. Sphseridia 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 Arceosoma coriaceum. Obj. II. Oc. I. 



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



- 29. - Arceosoma 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 temie, Chall. St272). 

 Obj. II. Oc. III. 



33- Valve of a triphyllous - Arceosoma 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 uranus. Obj. II. Oc. I. 



37 and 39. Valve of a small tridentate pedicellaria of Phormosoma placenta. 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 Peter sii. Obj. II. Oc. I. 



