SOLITARY CORALS. 213 



Dendrophyllia, de Blainville ('Diet. des. Sci. Nat.,' lx., p. 319, 1830). 



Dendrophyllia gracilis, M. Edwards and Haime (36). 



A portion of a colony, from deep water off Galle, appears to belong to this species. 

 The fragment only included three mature corallites, two of which, with the buds 

 attached to them, were decalcified for the study of the soft parts. The remaining 

 corallite is somewhat broken, but the size, septal characters and mode of budding 

 appear to be those of D. gracilis. 



Dendrophyllia minuscula, n. sp. Plate II., figs. 11 and 11a. 



Colony ai-borescent ; the trunk and branches slender ; the lateral corallites disposed 

 in alternate and opposite pairs. Costae of equal size, rather prominent, finely 

 granulated. Calice circular, with a fairly deep fossa. Columella formed of a few 

 calcareous trabecular, moderately prominent in the fossa. Septa in six systems and 

 three cycles, with traces of a fourth. The primary septa exsert, forming a crown of 

 six points at the edge of the calice. The apparent tertiary septa next in size closely 

 applied to the primaries at their outer ends, their inner ends converging and uniting 

 deep in the calice just before joining the columella, The apparent secondaries short, 

 usually not united to the inner ends of the tertiaries. Height of colony 25 millims. ; 

 diameter of calices 2 millims. 



A single small colony and a fragment of this very elegant species from deep water 

 off Galle. The large exsert primary septa recall those of Balanophyllia laprobance, 

 but the corallites are much smaller, the primary costaa are not prominent, and there 

 are three cycles of septa with traces of a fourth in one system only, in the corallite 

 depicted in fig. 11a. This figure shows very clearly that the apparent tertiaries are 

 the exoccelic bifurcated ends of the original secondary cycle, and that the apparent 

 secondaries are the entoccelic septa formed in the angles of the secondaries, and, 

 therefore, are the third cycle in order of appearance. 



Heteropsammia, M. Edwards and Haime (36). 

 Heteropsammia michelini, M. Edwards and Haime (36). 

 Numerous specimens from nearly all stations. The septal arrangement and anatomy 

 of this genus are fully described in the second part of this paper. 



PART H AN ATOMY. 



1. Heterocyathus sequicostatus, M. Edwards and Haime. 

 (Plates III. and IV., figs. 12 to 21.) 



Gardiner (23) has given a short account of the anatomy of this species, but he 

 does not deal with the minute structure of the corallum, and I am able to supplement 

 his description of the anatomy of the polyp in many particulars. 



