438 prof. p. m. duncan on deep-sea [May 1 G, 



2. A small, stunted corallum on the same shell as the last, has 

 well-developed calices and costal markings in some places, but, as 

 in no. 1, not everywhere. The calices are of two kinds — those with 

 a large columella made up of several trabeculse forming a more or 

 less globular or circular mass, and those with elongated columellas 

 and well-developed pali. 



3. A small trunk on the lower side of the same shell presents 

 calices with a large columella and small pali. The costse are very 

 marked around some calices. 



These variations in the calicular arrangement in the same corallum 

 and in the same species are very significant, and they prove that the 

 presence or absence of costse, the septal number, the number and 

 dimensions of pali, and the size and development of the columella 

 must not be taken separately to decide specific destinctions if some 

 of the other structures retain their special characters. 



This coral is a very interesting species, as it is only found off St. 

 Helena ; but it, when worn, and when the columella is small, singu- 

 larly resembles the Synhelice of the chalk. 



Cyathohelia axillaris, Ellis & Solander, sp. 



This common species, from the Japanese seas, is described in 

 Milne-Edwards and Jules Haime's 'Hist. Nat. des Coral.' vol. ii. p. 

 110. They omit to state that the pali are situated before the pri- 

 mary, secondary, and tertiary septa, and that in young calices the 

 columella is on a much lower level than the tall papillae of the crown 

 of pali. The thickness of the septa varies according to age. 



Family Astr^eid^e. 



Subfam. Astr^ein^e. 



Genus Antillia, Duncan, Quart. Journ. Geol. Soc. 1864, p. 28. 



Antillta lonsdaleia, Duncan, Quart. Journ. Geol. Soc. vol. 

 xx. pi. iii. figs. 4-4c. 



A variety of this Miocene species which I described from the Ter- 

 tiaries of San Domingo is found in the Japanese seas at no very 

 great depth. It was sent over by Capt. St. John; and on examining 

 the two specimens I could not distinguish a specific difference 

 between them and the fossil form. The arrangement of the lobed 

 septa, their high cyclical number, their ornamentation and endotheca 

 are most close in their resemblance. The general shape differs a little ; 

 and the compressed form of the calice constitutes a variety only. 



The side view of the corallum is given in Plate XLI. fig. 1, and 

 the details of the calice in Plate XLI. fig. 2. 



Division Cladocorace.e. 



Dendrocora, gen. nov. 



The corallum is bushy, the ramifications being frequent from all 

 parts, short and frequently forming groups in one plane. The wall 

 is thick except near the calices ; the costse are distinct, and thicker 

 than the septa. The columella is lax and trabecular, having pali 



