ii9 



species which have retained their place in Tubulipora. Discopora was represented by D. hispida 

 only, a species which has been placed in Lichenopora by the majority of recent authors. 



In the present Report the Family Tubuliporidae is understood to include the genera 

 there placed by Hincks, with the exception of Diastopora and Entalophora ; and to consist, 

 therefore, of Cyclostomata in which the zooecia are restricted to one surface of the colony and 

 are commonly arranged in connate alternating series. Cancelli are absent in the majority of the 

 species. The ovicell is a modified zooecium which is usually much dilated in the region where 

 the embryos undergo their development. 



The study of recent Cyclostomata is greatly complicated by the fact that this Suborder 

 is represented by an immense number of fossil forms, which have frequently been named from 

 imperfect fragments-, and by the fact that it has been investigated to a large extent independently 

 by Palaeontologists and students of the recent species. The conclusions of these two sets of 

 workers referring to nomenclature have often been very different; and there have been many 

 divergences of opinion with regard to the propriety of identifying recent with fossil species. It 

 must be remembered that the recent species constitute but a small fraction of the number of 

 those known in a fossil condition. A satisfactory decision as to the limits and interrelationships 

 of the genera must be based on a full consideration of the fossil forms. I do not feel myself 

 competent to undertake this task ; and I am aware of the fact that the conclusions drawn from 

 a study of the recent forms alone must be subject to a considerable amount of revision at the 

 hands of those who combine a knowledge of fossil and recent species. 



Reptotubigera D'Orb. 



Reptotubigera D'Orbigny, 1853, "Pal. Franc. Terr. Crét.", p. 751. 

 Stomatopora (pars), Hincks, 1880, "rust. Brit. Mar. Pol.", p. 424. 



The genus Reptotubigera was introduced by D'Orbigny for forms which are entirely 

 adherent, having their zooecia arranged in series, as in typical species of "Idmonea". It was 

 regarded by him as synonymous with Obelia Lamouroux : ), preoccupied by Obelia Péron and 

 Lesueur (Hydrozoa). Gregory 3 ) regards it as a synonym of Probosciua 8 ) Audouin. 



Obelia tubulifera was described by Lamouroux from recent Mediterranean specimens, 

 which it might be unnecessary to separate from Ttifailipora. Proboscina boryi was named by 

 Audouin from specimens, obtained in Egypt, which had been figured by Savigny. The hgures 

 show that these are also Tiebu/ipora-like forms, with well developed peristomes, but having 

 ovicells of an unusually simple character. It is not stated whether they came from the Mediter- 

 ranean or the Red Sea coast. Most of the species figured by D'Orbigny, namely R. neocomiensis 

 (PI. 763, figs 1 — 3), R. marginata (PI. 750, figs 19 — 21), R. ramosa (PI. 751, figs 1 — 3), and 

 R. serpens (PI. 751, figs 4 — -7) are adnate forms in which the branches are linear or not much 

 expanded, and in which the peristomes seem to be comparatively short. With this type the 



1) Lamouroux, 1821, "Exp. Méthod."', p. 81 (nee Obelia Péron and Lesueur). 

 z) Gregory, J. W., 1896, "Cat. Foss. Bry. Brit. Mus.", "Jurassic Bry.", p. 59. 

 3) For a criticism of this genus, see Walford, 1889, "Bry. Inf. Oolite Shipton Gorge", I, Q. J. Geol. Soc. XI. V, p. 565. 



119 



