28 BULLETIN OF THE 



Xanthobrissus A. Ao. 

 This genus is closely allied to Meoma of Gray ; differs from it by the po- 

 sition of the vertex, which is near the anterior extremity. Lateral ambu- 

 lacra of equal size, anterior ambulacrum in a deep groove. Subanal fasciole 

 heart-shaped, with lateral branches extending to the side of the anal 

 system. 



Xanthobrissus Garretti A. Ao. 



Syn. Brissopsis Garretti Ag. MS. 



Anal system large, pointed at both extremities. Posterior ambulacra 

 arched exteriorly ; few large tubercles near the apex of rosette on both 

 sides of anterior ambulacra. Tubercles numerous, small. Spines very 

 slender, quite long. — Kingsmills Islands. 



Brissopsis Ao. Cat. Rais. 

 Brissopsis lyrifera Ac. Cat. Rais. — North Europe. 



Agassizia Val., Ag. Cat. Rais. 

 Agassizia scrobiculata Val, Ag. Cat. Rais. — Panama. 



Moera Mien. Rev. et Mag. de Zool. 1855. — Schizaster Ag. p. p. 



Moera atropos Mich. Rev. et Mag. de Zool. 



Syn. Schizaster atropos Ac. Cat. Rais. ; Schizaster lachesis GiR. Proc. 

 Bost. Soc. Nat. Hist. 1850. — Charleston, S. C, and Texas. 



Published August 15, 18G3. 



