XXXIII—The Alcyonarians of the Scottish National Antarctic Expedition. By 
Prof. J. Arthur Thomson, M.A., and Mr James Ritchie, M.A. (With Two 
Plates.) 
(MS. received May 30, 1905. Read July 3, 1905. Issued separately January 18, 1906.) 
The Alcyonarians collected by Mr W. 8. Bruce on the Scotia voyage represent 
nine species—six of which are new, namely :— 
Primnoisis ramosa, ni. sp. 
Thouarella brucei, n. sp. 
Amphilaphis regularis, Wright and Studer. 
Primnoella scotix, n. sp. 
Primnoella magellanica, Studer. 
Paramuricea robusta, n. sp. 
Gorgona wiighti, 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’ 8., 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 KoOuurker described and 
named. 
With the exception of the much-weathered Primnoisis ramosa, un. sp., all the 
specimens are admirably preserved. 
Family ISID. 
Sub-family Mopszinz. 
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, 
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