444 SUMMARY OF CURRENT RESEARCHES RELATING TO 



thrix, of which a revision, based on a long series, ought to be made 

 before ever another species of it is described. 



Antarctic Holothuroids.* — Remy Perrier reports on the Antarctic 

 Holothuroids from Patagonia and New Zealand in the museums at Paris 

 and Vienna. He describes 19 species from Patagonia, and 11 from New 

 Zealand — e.g. Synallactes moseleyi (Theel) Remy Perrier, Stichopus 

 (? Holothurm)patagonicus Remy Perrier, Psolidium co/irergens {Kerowdrd) 

 Remy Perrier, Pseudopsolus macquariensis (Dendy) Ludwig, Gaudina 

 pulchella sp. n., Trochodota purpurea (Lesson) Ludwig, and Ghiridota 

 marmzelleri Remy Perrier. 



Deep Sea Holothuroids of Indian Ocean.f — R. Kcehler and C. Vaney 

 report on a large collection of 75 species of deep-sea Holothuroids, of 

 which 59 are described as new. 



Ccelentera. 



List of Irish Ccelentera. J — Jane Stephens has compiled a useful list 

 of Ccelentera from the Irish marine area. It includes about 250 species, 

 excluding many doubtful ones. The hydroids are mostly widely dis- 

 tributed species, some of them having been recorded for North America, 

 India, Australia, and New Zealand. On the other hand, Tubklava 

 Interna, T. cornucopia, and Heterocordgle conybearei have been recorded 

 for two, or at the most, three localities ; while Perigonimus gelatinosus, 

 P. inflatus, and GampanuJina tvrrita seem to have been found hitherto 

 only off the Irish coast. 



The overlapping of species characteristic of the northern and 

 southern faunas on the south-west coast of Ireland is illustrated. Thus, 

 among the Hydromedusse, Melicertidium octocostatum and Margelis pyra- 

 midata are northern forms, while the Siphonophore Mugghea atlantica is 

 southern. The Trachomedusae and Narcomedusa? are essentially Atlantic 

 forms. Among the Sea-anemones Epizoanthus iacrustatus, Parazoanthus 

 anguicomus, and perhaps Actinauge richardi, may be regarded as northern 

 species, while Gephyra dohraii is distinctly southern. 



Bougainvillia fruticosa Allm. — a Variety of B. ramosa, Van 

 Ben.§ — P. Hallez states that these are two varieties of the same species. 

 B. ramosa is a calm-water form, and B. fruticosa a product of water in 

 continuous agitation. He regards this instance as a further proof of 

 the morphogenic action of water in motion, as has been quoted by Giard 

 in the case of Gampanularia caliculata Hincks. 



Classification of Medusae. ||— 0. Maas has revised Haeckel's family 

 of the Cannotidae, and finds it a heterogeneous group. He rearranges 

 the members thus : — Anthomedusaj (near the Tiaridae), families, 

 Bythotiaridse, Williadae. Leptomedusaa (near the Thaumantiadae) 

 families, Berenicidae, Polyorchida3. 



* Ann. Sci. Nat. (Zool.) ser. 9, i. (1905) pp. 1-80 (10 figs.). 



t An Account of the Deep-Sea Holthuroidea collected by R.I. M.S. ' Investi- 

 gator,' (Calcutta, 190.".) 123 pp., 15 pis. 



% Proc. R. Irish Acad., xxv. Sect. B, No ?< (1905) pp. 25-92. 



§ Comptes Rendus, cxl. (1905) pp. 457-9. 



|| SB. K. Akad. Wiss. Miinchen, 1904, pp. 421-45. 



