STRUCTURE AND RELATIONS OE CERTAIN CORALS. 
95 
jjora Deshayesii as an existing coral closely allied to the palaeozoic genus Favosites. 
The coral has abundant complete horizontal partitions and closely resembles Alveopora 
fenestrata; it connects the Favositidse and Poritidae, and is a new proof that the 
Tabulates belong- to the Anthozoa and not to the Hydroids. 
Prof. P. Martin Duncan (“A Description of the Madreporaria dredged up during the 
Expeditions of H.M.S. 4 Porcupine ’in 1869 and 1870, ’’Trans. Zool. Soc. London, vol. viii. 
part 5, p. 335) describes Guynia annulata as a recent Rugose coral. In this coral there 
is no endotheca. In three specimens there were evidences of a hexameral septal arrange- 
ment. One had an octameral arrangement at the base and a hexameral at the calicular 
margin. This specimen is believed to illustrate the formation of the Neozoic type from 
the Rugosa. Prof. Duncan has treated on the affinities of Guynia with Haplophyllia in 
a paper in Phil. Trans. Roy. Soc. 1872, which paper I have not seen. Haplophyllia 
paradoxa is another recent supposed representative of the Rugosa from the deep sea 
described by Pourtales in the 4 Bulletin of the Museum of Comparative Zoology, 
Harvard Coll. Camb. Mass.’ no. 7, and also in his work on deep-sea corals already cited. 
Unfortunately the soft parts of neither Guynia nor Haplophyllia were obtained for 
examination. 
The latest paper treating on the classification of corals to which I have access is by 
M. G. Dollfus (“ Observations critiques sur la classification des Polypiers paleozoiques,” 
Comptes Rendus de l’Acad. des Sciences, t. lxxx. no. 10, 15 Mars 1875, pp. 681— 
683). M. Dollfus classes certain of the Tabulata, the Heliolitiens ( Heliolites , Lyellia , 
Propora), with the modern Milleporiens (. Heliopora , Millepora, Seriatopora), connecting 
them by the Pocilloporiens ( Pocillopora , Axopora, Polytremacis ) most unfortunately, 
since Pocillopora is a Hexactinian. He considers all these genera to be Hydroids. 
The Cheetetiniens ( Stellipora , Monticulipom , Chcetetes, Ccenites, Pania, Beaumontia, 
Labechia, Pekaya) he considers to be Bryozoa allied to the Jurassic Heteropora and 
Cretaceous Ptadipora. The group of Favositiens [Alveolites, Favosites , &c.) presents, as 
he considers, relations with the tubuline Bryozoa, the Cyclostomata. 
It will be seen from the above abstracts that the relations of the Tabulate and Rugose 
Corals are in a very uncertain condition, and that there is very wide difference of opinion 
on most important points. It is hoped that some light will be thrown on the subject 
by the present paper. 
In addition to the authors cited above, the following papers and works will be referred 
to in the sequel (they have mostly been accessible only in abstract) : — 
Quenstedt .... Handbuch der Petrefactenkunde. Tubingen, 1867. 
Metschnikoff . . . On the Development of Kallipliobe (Busch). Bullet. Acad. 
Imper. St. Petersbourg, t. xv. pp. 502, 503. 
Lacaze-Duthiers . . Hist, de Developpement des Coralliaires. Arch. Z. exper. i. 
pp. 289-296.' 
