TRIBE III. MADREPORACEA. 457 



differs in having the calicles scabrous and striate, and not appressed 

 to the branch. 



Madrepora corymlwsa, Lamk., ii. 447, No. 3. Many species are included by Lamarck 

 under this name, of which the above corresponds nearly with his description, which is as 

 follows: " M. ramosissima, orbiculata, ramis ascendentibus, ramulosis, ramulis creberri- 

 mis, in corymbum latissimum obliquum digestis." " Ses cellules tubuleuses sont ine- 

 gales, serrees et striees en dehors." The figure by Rumphius (Amb. tab. 86, fig. 2), 

 to which Lamarck refers, represents a vase-shape species, concave above, near the M. 

 spicifera or surculosa. 



24. MADREPORA APPRESSA. (Ehrenberg.) 



M. prostrata, ramis horizontalibus in laminam complanatam subinte- 

 gram coalitis ; infra nuda ; supra, ramulis erectis crebris, spidfor- 

 mibus, fere teretibus, 2-3" longis et 3'" crassis. CoraUum cali- 

 culo apicali prominulo ; later alibus confertis et cequalibus, !'" longis, 

 appressis subimbricatis, rostrato-nariformibus, subtilissime striatis, 

 Stella bene conspicud, duabus lamellis panto prominulioribus, infra 

 conniventibus. 



Prostrate, the horizontal branches coalescing into a plate which is 

 nearly entire, flattened, and naked below ; above, branchlets erect, 

 crowded, spiciform, nearly terete, 2 to 3 inches long and 3 lines 

 thick. Corallum with the apical calicles a little prominent; the 

 lateral crowded and equal, 1J lines long, appressed and subimbri- 

 cate, rostrato-nariform, very minutely striated ; star very distinct, 

 two of the lamellae a little the most prominent, and meeting below. 



Plate 34, fig. 3, branchlets of corallum, natural size; 3 a, calicle, 

 natural size; plate 31, figs. 8 a, 8 b, different views of calicle, en- 

 larged. 



East Indies, Singapore. Exp. Ezp. 



This common species forms very broad, flat-top fronds, growing 

 apparently from a lateral attachment. The under surface, formed by 

 the coalesced branches, is nearly flat and naked, with here and there 

 a break. Above, the slender branchlets are remarkably neat and even 

 in their subimbricate calicles, which are minutely striate, and about 

 one and a half lines long. One specimen in the collections is two 



115 



