the Atractjlis coccinea of T. S. Wright. ry.] 



No gonopliores were found. Hincks (' Hydroid Zoophyte?,' 

 1868) provisionally transferred the species to the genus 

 Perigordmus. Allman does not mention it at all, and I have 

 not been able to find any subsequent record of it. 



In 1905 I obtained near Millport Marine Biological Station 

 numerous specimens of what is almost certainly the Atractylis 

 coccinea of Wright. They differ from Wright's specimens in 

 liaving twelve equal tentacles, but they all have the hydranth 

 set at an obtuse angle with the stalk, a very characteristic 

 point. 



The species was not figured by "Wright, and his description 

 was in some respects incomplete. I therefore give here a 

 detailed description of my specimens and a figure. 



The species must be assigned to the genus Wrightia, 

 Allman (1872). The genus Atractylis, Wright (1859), 

 contained forms which are now di-^tributed among the genera 

 Boufjainvillia, Periyonimus, and Wrujhlia. Hincks's genus 

 Atractylis is synonymous with AUman's Wrightia, but the 

 name Wrightia is to be preferred, since Atractylis is the 

 long-established name of a genus of plants. Wrightin, when 

 constituted by Allman, contained one species, Wrightia 

 arenosa [Atractylis aretiosa, Aider, Supj)!. Catalogue, p. 7, 

 pi. X. figs. 5-7), and the diagnosis of the genus contained 

 some of tlie specijic characteristics of Wrightia arenosa (Alder), 

 namely, the funnel-shaped stems, the retractile hydranth, and 

 the position of the gonopliores on the hydrocaulus. I propose 

 the following definition of the genus, which is in all essentials 

 the same as AUman's definition, but leaves out any reference 

 to the jjurely specific characters of either of the two species 

 which the genus contains, arenosa (Alder) and coccinea 

 (Wright). 



AYrightia. 



AtradijJis (iu part.), Wright, Ediii. New Phil. Journ. ix. p. 106 (1859). 

 Alracti/lis, Iliiicks (ISr.S). 

 Wriijldia, Allman (1872). 



Hydrocaulus erect, unbranched, arising from a creeping 

 hydrorhiza. Perisarc expanding above to form a protective 

 sheath which clothes the hydranth up to the base of the 

 tentacles. 



Reproduction by fixed sporosacs, which are partially or 

 wholly invested by a cbitinous envelope. 



Wrightia coccinea (Wright). 



AtracUflis coccinea, Wripht (1861). 

 Prriffommm (?) r..r,^;„ru<. Tlincks (186S). 



