Plate 51. 

 1-4. Phormosoma Zealandiae A. Ag. ; " Challenger " Station 169. 



1. Actinal system of specimen 24 mm. in diameter. 



2. Abactinal system of same specimen as fig. 1. 



3. Odd anterior ambulacrum of the same. The dotted line indicates the position of 



the ambitus. 



4. Part of odd anterior ambulacrum of the same specimen as fig. 3, showing the inner 



row of tentacles of the double pores. 



5-13. Asthenosoma pellucidum A. Ag. ; "Challenger" Station 192. 



5. Actinal system of specimen 34 mm. in diameter. 



6. Abactinal system of same as fig. 5. 



7. Odd anterior ambulacrum of same. , 



8. Actinal plates of left posterior ambulacrum of same, showing tentacles and spheridii. 



9. The first three actinal plates of the oid anterior ambulacrum adjoining the actinostome 



of the same. 



10. Plates 21 to 24 of the odd anterior ambulacrum of the same. 



11. Plates 36 to 39 of the odd anterior ambulacrum of the same. 



12. Plates 48 to 51 of the odd anterior ambulacrum of the same. 



13. Plate 75 to ocular plate of the odd anterior ambulacrum of the same. 



I 



