ON THE SOLITARY CORALS, COLLECTED BY DR A. WILLEY. 163 



Genus. Thecocyathus, Milne- Edwards and Haime. 



3. Thecocyathus minor, n. sp. (Fig. 3.) 



The corallum is cylindrical, straight, of nearly equal diameter throughout, closely 

 covered up to the calicular margin by a dense, glabrous epitheca, which is somewhat 

 transversely marked. 



The calice is nearly circular in shape and shallow. The septa are closely 

 arranged with extremely granular sides ; they project into the calice for about a 

 quarter of its diameter and are scarcely at all exsert. The arrangement of the septa 

 is hard to distinguish, hut each of the six systems has at least six septa, the 

 primaries, secondaries and tertiaries being complete, but the quaternaries only repre- 

 sented by two septa on opposite sides of one of the tertiaries. The primaries are a 

 little thicker and project rather further into the calice than the other cycles which are 

 nearly equal. The centre of the calice is filled up by a large number of very 

 granular, round or elongated papilliforni projections which gradually decrease towards 

 the centre ; these are the pali and the papillae of the columella. The pali appear 

 to be single in front of the primary ami secondary septa, but in front of the latter are 

 generally rather larger, higher ami more elongated. Pali also are found opposite the 

 tertiary septa, where quaternaries are present, and usually consist of two or three 

 projecting papillae, which merge into those of the columella. 



Height of the single specimen, 7 mm. Diameter of the calice of same, 4 nun. 



Loc. Sandal Bay, Lifu ; 40 fathoms. 



This coral is closely allied to Thecocyathus cylindraceus (Pourtales) from the 

 Florida Reef. It differs, however, in the very irregular arrangement of its pali and 

 its narrow septa. 



Genus. Deltucycithii.s, Milne-Edwards and Haime. 



4. Deltocyathus ornatus, n. sp. (Fig. 25.) 



The corallum is flattened discoidal and free. The inferior surface is almost flat 

 with a slight flattened prominence in the centre almost like the scar of a former 

 attachment. The costae are nearly equally developed ; they commence as lines of low, 

 round, blunt granules at the sides of the central prominence, which itself is irregularly 

 covered with similar granules. Towards the margin the costae form a series of 

 rounded ridges and the granulations become sharper and more spiny. 



The calice is round, shallow but yet with a large and distinct axial fossa. The 

 septa are very similar in appearance and of nearly equal thickness ; their faces are 

 sparsely covered with fine elongated pointed spines. There are six systems and four 

 complete cycles, of which the primaries and secondaries are almost precisely similar, 

 being equally broad, about 1 mm. exsert, and possessing similar elongate paliform 

 lobes. The primaries, however, run rather deeper into the calice and their paliform 

 lobes are rather nearer its centre, higher and more elongated. The tertiaries are not 

 quite so broad as the preceding cycles but extend about as far into the calice as 



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