[Reprinted from the TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH, 

 vol. xli., pp. 85L-860, July 1905.] 



The Alcyonarians of the Scottish National Antarctic Expedition. By Professor 

 J. Arthur Thomson, M.A., and Mr James Ritchie, M.A. (With Two Plates.) 



The Alcyonarians collected by Mr W. S. BRUCE on the Scotia voyage represent 

 nine species six of which are new, namely : 



Primnoisis ramosa, n. sp. 



Thouarella brucei, n. sp. 



Amphilaphis regularis, Wright and Studer. 



Primnoella scotias, n. sp. 



Primnoella magellanica, Studer. 



Paramuricea robusta, n. sp. 



Gorgonia ivrighti, n. sp. 



Gorgonia studeri, n. sp. 



Umbellula durissima, Kolliker. 



Apart from the six new species, the collection is of interest in extending our know- 

 ledge of the geographical distribution of previously recorded forms. Thus Amphilaphis 

 regularis, Wright and Studer, previously collected off Inaccessible Island, Tristan da 

 Cunha, and off Nightingale Island, was got in abundance off St Helena ; Primnoella 

 magellanica, Studer, previously collected off Monte Video and in the Magellan 

 Straits, was obtained at Burdwood Bank 54 25' S., 57 32' W. ; while Umbellula 

 durissima, Wright and Studer, previously obtained by the Challenger from the North 

 Pacific Ocean, south of Yeddo, was found by the Scotia at 48 06' S., 10 5' W. 



It may also be noted that the fine specimens of Umbellula durissima, Kolliker, 

 give us a better idea of this beautiful species than the single young specimen collected 

 by the Challenger. Several of the specimens obtained by Mr BRUCE are much 

 larger, older, and of more vigorous growth than that which KOLLIKER described and 

 named. 



With the exception of the much-weathered Primnoisis ramosa, n. sp., all the 

 specimens are admirably preserved. 



Family ISID^E. 



Sub-family MOPSEIN.E. 

 Primnoisis ramosa, n. sp., PL I. fig. 2. 



The specimen is much weathered, quite devoid of polyps, and without the basal 

 portion. Although far from complete it attains a height of 230 mm., and a maximum 

 lateral expansion of 45 mm. The bare stem bends frequently, at irregular intervals, 



(ROY. soc. EDIN. TRANS., VOL. XLI., 851.) 



