PLATE XXV f. 



1-3. Urechinus naresianus A. Aq. 



Fig. 1. Aetinostome of specimen. 33 mm. long, diameter. 

 Fig. 2. Abactinal system and adjoining part of test of same. 

 Fig. 3. Anal system and adjoining part of test of same. 



4. Rhiriobrissua rnicrasteroides A. Ao. 

 Fi". 4. Specimen 32 mm. long, diameter, seen from the abactinal side. 



5, 6. Schizaster (Peria3ter) limicola A. Ao. 



Kg. 5. Anal system of specimen GS mm. long, diameter. 



Fi :■ 6. Apical system, with surrounding part of test of same. 



7-1 S. Brissopsis lyrifera Aga83. 



Elongated type, seen from the abactinal side, natural size. 



The same, seen in profile. 



Enlarged view of posterior extremity of test, showing the anal system and fasciole, with the 

 subanal fasi 



Portion of lateral interambulacral part of test near the ambitus. 



Portion of posterior lati id ambulacral zone. 



Portion of anterior lateral ambulacra! zone. 



Globular type of the species, seen from the abactinal pole, natural size. 

 I i i '1 ; i 



Fig. 15. Postei I enlarged, corresponding to Fig 9 in the elongated type. 



Fig. Hi. Corresponds to Fig. 10 of the elongated type. 

 Fig. 17. Corresponds to Fig. 11 of the elongated type. 

 Fig. 18. Corresponds to Fig. 12 of the elongated U pe. 



