310 ZOOPHYTES. 



concave or nearly flat. Corallum with thin fragile lamellae, closely 

 crowded, not radiate, very minutely denticulate; the medial oriri me 

 continued quite to each extremity. 



Plate 21, fig. 1, profile of vertical cross section. 



Tahiti, Society Islands. Exp. Exp. 



The specimens in the collections are seven inches long, two and a 

 half wide, and one inch thick at middle. One is nearly flat below, 

 and the other has a concavity half an inch deep. The lamellae are 

 very thin and crowded, about twenty larger being counted in the 

 breadth of an inch. 



6. HERPETOLITHUS CRASSUS. (Dana.} 



H. angusto-oblongus, crassimus (margine et media 1J-1J"), extremis 

 late rotundus, valde convexus et subtus concavus ; umbrinus, tenta- 

 culis brevibus, late virentibus. Corallum lamellis confertis, nee ra- 

 diatis ; subtus spinulosum, spinulis crassis. 



Narrow oblong, very stout (at margin and at middle 1| to l inches 

 thick), broadly rounded at each extremity, much convex, and below 

 concave ; colour umber, tentacles very short, bright green. Co- 

 rallum with the lamellae much crowded, not radiate ; spines below 

 stout. 



Plate 20, fig. 5, zoophyte expanded, natural size ; 5 a, profile of 

 section of corallum ; 5 o, outline of a lamella ; 5 b, a marginal lamella. 



Feejee Islands. Exp. Exp. 



This is a large and heavy species, with the ends broadly rounded. 

 One specimen is a foot long, somewhat distorted, three and a half 

 inches broad and three high, with a concavity below an inch deep ; 

 thickness of the corallum one and a quarter inches. Another is seven 

 and a half inches long by five broad, and three and a half high. The 

 lamellae are much crowded, not very thin, and vary from half an inch 

 to an inch in length. The medial oririme does not extend to the 

 extremities. 



