TRIBE I. ASTR^EACEA. 319 



of proper tentacles around the polyp-mouths, there is a series of tuber- 

 culiform organs corresponding to tentacles, arranged along over the 

 teeth of the large lamellae. 



In allusion to the cap shapes produced by the species, the generic 

 name is derived from U ov, animal, and Xo?, a cap. 



ZOOPILUS ECHINATUS. (Dana.) 



Z. pileiformis, aut inverso patelliformis. Corallum tenue ("), fragile ; 

 lamellis majoribus " remotis, valde dentatis, dentibus angustis, ince- 

 qualibus, et apice granulosis ; intermediis tenuissimis, confertissimis, 

 denticulatis ; oririmis non bene conspicuis, ferme " remotis. 



Cap-shape or inverted dish-shape. Corallum thin ( inch), fragile, 

 larger lamellae ^ of an inch distant, strongly dentate, teeth narrow, 

 unequal, and granulous at apex, the intermediate lamellae very thin, 

 much crowded, denticulate ; oririmes not very distinct, about an 

 inch apart. 



Plate 21, fig. 6, corallum, natural size; 6 a, outline of part of a 

 section. 



Feejee Islands. Exp. Exp. 



One of the specimens in the Expedition collections is ten inches 

 long, seven broad, and five high ; another, more resembling an in- 

 verted platter, has nearly the same lateral dimensions, with a height 

 of three inches. The depression at centre in the specimen figured, is 

 an accidental distortion, and not the position of a medial oririme. The 

 larger lamella; project about one-eighth of an inch above the interme- 

 diate, which are three to six in number, nearly equal, very thin, and 

 closely crowded. 



III. Fungida gemmatce affizte. 



GENUS VII. PAVONIA. LAMARCK. 



Fungida affixa, gemmatce, explanatce aut glomerate aut interdum sub- 

 ramosce ; potypis obsolescenter tentaculatis, spar sis, raro transverse 



