28 



Proceedhujs of the Royal Irish Academy. 



Among the Hydromedusae, Melicertidium octocostatim and Margelis 

 pyramidata, for example, are northern forms, while the Siphonophore 

 Muggicea atlantica is southern. The Trachomedusse and Narcomedusse 

 aie to be regarded merely as visitors to the coast from their ocean 

 home ; they are essentially Atlantic forms. Among the Sea-anemones 

 Upizoanthus incrustatus, Para%oanthm anguicomus, and perhaps Actin- 

 auge richardi, may be regarded as northern species, while Gephyra 

 dohrnii is distinctly southern. 



Owing to the vague and indefinite character of the descriptions in 

 some of the older papers, it is almost impossible to refer the species in 

 question to their proper positions in the group. A list of the names of 

 these doubtful species is given in the appendix. An index of generic 

 and specific names is also given at the end of the paper. 



My thanks are due to Dr. Scharfi for the advice and assistance he 

 so kindly gave me when drawing up this list. 



B1BL10GKA.PHT. 



Allman, G. J. : 



1844. Synopsis of the genera and species of Zoophytes inhabiting 

 the fresh waters of Ireland. Ann. & Mag. JS'at. Hist., xiii., 

 pp. 328-331; andErit. Assoc. Eep. for 1843, Transactions 

 of the Sections, p. 77. 



1844a. On a new genus of Hydraform Zoophytes {Cordylophora 

 lacustrisy All.). Proc. Eoy. Irish Acad., ii., p. 395. 



1846. Description of a new genus of Helianthoid Zoophytes {Cory- 

 nactis viridis, All.). Ann. & Mag. J^'at. Hist., xvii., 

 pp. 417-419 ; and Erit. Assoc. Eep. for 1844, Transactions 

 of the Sections, p. 66. 



1858. On the Structure and Eeproductive Organs in certain Hydroid 

 Polyps. Proc. Eoy. Soc. Edinburgh, iv., pp. 50-64. 



1858a. Additional Observations on the Morphology of the Eepro- 

 ductive Organs in the Hydroid Polyps. Proc. Eoy. Soc. 

 Edinburgh, iv., pp. 123-137. 



1863. On some new Eritish Tubulariidse. Erit. Assoc. Eep. for 



1862, pp. 101-103. 



1864. Notes on the Hydroida. Ann. & Mag. Xat. Hist. (3), xiv., 



pp. 57-64, Plate i. 

 1871-72. A Monograph of the Gyninoblastic or Tubularian 

 Hydroids. Parts I. and II. Eay Society, London. 



