266 ZOOPHYTES. 



16. MEANDRINA CAUDEX. (Ehrenberg.} 



M. erecta, crassa, cylindrica. Corallum collibus dilatatis, plants, lamel- 

 lis crassis, paucis, paululum prominulis, alternis majoribus, fossis 

 lineam latis. 



Erect, stout, cylindrical. Corallum with the ridges dilatate, flat, 

 lamella? stout, few, a little prominent, the alternate larger, fossa? a 

 line broad. 



This species by Ehrenberg is his Dendrogyra caudex. The cylin- 

 ders are four inches thick, and the sulci a little narrower than in the 

 cylindrus. 



Meandrina Dendrogyra caudex, Ehrenb., Ixii. subgenus ii., sp. 2. 



APPENDIX. The two following species are imperfectly described 

 by Ehrenberg. 



M. Platygyra lamellina. " Quadripollicaris, subglobosa, larnellis 

 denticulatis, dilatatis, cristis obtusis, 2-4"' distantibus, 3'" altis.'' 

 " Lamellis latis, cristis obtusis insigne." Red Sea. 



M. Platygyra spatiosa. " Novempollicare, incrustans, anfractibus 

 angustis, parum angulosis, distantia 2 linearum, lamellis crassis, 

 spatiosis, latis, mediis fere contiguis, sulco angustissimo." A worn 

 specimen in the Berlin Museum. 



GENUS IX. MONTICULARIA. LAMARCK. 



AstrceidcB aggregates, discis seriatim reticulatimque gemmantibus et non 

 dichastids, interstitiis conicis ; tentaculis basi conulorum dispositis. 

 Corolla cellulosa, cettis nulMs, superfaie conulis lamello-radiatis tectd. 



Aggregate Astraida?; disks seriately and reticulately budding, and 

 not dichastic, with no interstices between the polyps, but small 

 cones, around which the tentacles are arranged. Coralla cellular; 

 cells none, surface covered with small lamello-radiate cones. 



