PLATE XIX. 



Brissopsis lyrifera, /. 1 - 0. 



1. Specimen, measuring 5.6""- in diam., from abactinal side. 



2. Specimen, measuring 5. 6""- in diam., in profile. 



3. Specimen, measuring 5.6"°- in diam., from actinal side 



4. Older specimen, showing branch leading from subanal fascicle to peripetalous fasciole. 



5. Posterior extremity, profile of same. 

 G. Profile of specimen measuring 22.5""- 



7. Peripetalous fasciole of young specimen, measuring about 3.6""" in long, diam.; 4 : S pairs of 



pores in anterior, 2 : 3 in posterior lateral ambulacra. 



8. Peripetalous fasciole of specimen intermediate between figs. 7 and 9. 



9. Peripetalous fasciole of specimen measuring 27. 9""' in long, diam., showing partial confluence 



of lateral ambulacra. 



Echiuocardium cordatum, /. 10 - 17. 



10. Seen from abactinal side, measuring 7.9""- in long. diam. 



11. Same from actinal side. 



1 2. Outline in profile of same. 



13. Actinostome of same magnified. 



14. Anal and subanal fascicles of same. 



15. Ambulacral rosette of same. 



IG. Ambulacral rosette of older (fully grown) specimen, showing confluent lateral ambulacra. 

 17. Disconnected anal and subanal fascioles of sjjecimen of fig. IG. 



