762 



SUMMARY OF CURliBNT RESEARCHES RELATING TO 



existence of an unpaired ventral tentacle, either marginal or dorsal, the 

 form of the mouth, the arrangement of the mesenteric septa, and the 

 prolougation of two of these septa as far as the pedal pore, together with 

 the mode of development of the embryo, furnish an accumulation of 

 proof in favoiir of that bilateral symmetry of CeriantJius which has 

 already been urged by Haime, 



Madrepore Corals from Ceylon.* — Dr. A. Ortmann describes the 

 collection of madrepore corals, brought by Prof. Haeckel from Ceylon, 

 and has been led to some new conclusions in regard to the systematic 

 relations and morphology of these Anthozna. Of Athecalia, ten new 

 species are described ; of Pseudothtcalia, two ; of Euthecalia, one ; while 

 a great number of forms, previously recorded, are briefly diagnosed. As 

 will be seen from these names, the investigator follows Heider's division 

 of the Madreporaria, and distinguishes the three orders as follows: — 



Athecalia. 



PSEUDOTHECALIA. 



Euthecalia. 



Theca 



compact. 



Synapticula 



present, sometimes 

 forming a ccenen- 

 chyraa or a porous 

 wall. 



meetiug iu a false 

 wall, otherwise ab- 

 sent. 



CcenencLyma 



from united synap- 

 ticula, or absent. 



from Cfistal-coenen- 

 chyma, or absent. 



absent, or compact 

 and not distin- 

 guishable from the 

 wall, or forming a 

 vesicular exotheca. 



Bepta 



those of adjacent 

 calices coalesce, or 

 lose themselves in 

 the cobnenchyma 

 or porous wall, 

 trabecular, porous 

 or compact, toothed. 



Extra material 



those of adjacent 

 calices meet, or are 

 prolonged as kteled 

 ribs over the false 

 wall, trabecular, 

 compact;, rarely 

 somewhat porous 

 above, toothed. 



not coalescing, not (?) 

 trabecular, comiiact, 

 margin entire. 



usually numerous. present or absent. 



sometimes a solid 

 mass of lime in the 

 calyx. 



The Athecalia are then divided into Thamnastrseacea, Madreporacea, 

 and Fungiacea ; the Pseudothecalia include especially the Astrseinae and 



* Zol.1. Jahrb., iv. (1889) pp. 493-590 (8 pis.). 



