224 ZOOPHYTES. 



the calicles are larger and deeper, the ridges broader, and the texture 

 more coarsely cellular within. As the calicles are but little distinct, 

 it forms a connecting link between the preceding species and the next 

 division. 



23. A. PALLIDA. (Dana.) 



A. hemispherica; polypis 6-8'" latis, discis pallide ccesiis, tentaculis 

 albidis, internis bursiformibus. Corallum aperte cellulosum, calicu- 

 lis conico-cylindricis, l-l'" altis, contiguis, extus remote lamello- 

 striatis, et subtilissimc denticulatis ; cellis 5-6'" latis, subprofundis, 

 intus coronatis ; lamellis tenuibus, apice angustis et paulo incequaliter 

 exsertis, parce dentatis: transverse secto, septis l-2-seriatim cellulosis ; 

 stellis vix multiradiatis cum cellulis parce decompositis. 



Hemispherical ; polyps 6 to 8 lines broad, disk pale bluish-gray, ten- 

 tacles whitish, the interior bursiform. Corallum open cellular ; 

 calicles conico-cylindrical, 1-1 J lines high, contiguous, exterior re- 

 motely lamello-striate and finely denticulate; cells 5 to 6 lines broad, 

 rather shallow, within coronate; lamellae thin, narrow above and 

 somewhat unequally exsert, sparingly dentate : in a transverse sec- 

 tion, septa with large cellules in 1 or 2 series; stars scarcely multi- 

 radiate with the cellules sparingly decompound. 



Plate 10, fig. 13, natural size; 13 a, tentacles enlarged of the two 

 series; 13 b, cells in outline; 13 c, vertical section of cell, with pro- 

 file of lamellae and ridges; 13 c', same, natural size; 13 d, transverse 

 section of corallum ; 13 e, vertical section of same. 



Feejee Islands. Exp. Exp. 



This coral resembles the denticutata, but has a broader sulcus to the 

 ridges, less unequal lamellae, which are also thinner, narrower at apex 

 and not vertical within the cell. The calicles are nearly cylindrical, 

 and in the specimen seen, were placed obliquely against one another, 

 like those of the A. Orb. coronata. The lamellae over the exterior of 

 the calicles are even, thin, nearly half a line apart, and almost as 

 much prominent. It is possible that the species may be one of the 

 Orbicellae. 



