General History of the Marine Polyzoa. 141 



structure, and its highly developed periderm. On further 

 consideration, however, I am satisfied that the peculiarities of 

 this very interesting ibrm have no generic value, and that 

 there is not sufficient ground for separating it from Barentsia, 

 Hincks, a genus previously established for the reception of an 

 Arctic species {B. bulbosa)*. 



Mr. Busk has taken the same view (' Challenger ' Report, 

 part ii. p. 41). While I agree with hira in his decision on 

 this point, I am quite unable to follow him when he proceeds 

 to suppress the genus Barentsia in favour of his own Ascopo- 

 daria, a " provisional " MS. name which he had connected 

 with a species of which no description or figure had been 

 published at the time when tlie genus Barentsia was fully 

 characterized in the ' Annals.' That Mr. Busk had " already 

 proposed to establish " a genus Ascopodaria (of which I had 

 no knowledge whatever) before my paper appeared could give 

 it no claim to precedence according to the received laws of 

 zoological nomenclature. In point of fact it never was defined 

 until Barentsia. had taken a place in the literature of the 

 Polyzoa. 



Pedicellina gracilis, Sars, must be associated with the 

 present form in the genus Barentsia, as it possesses the basal 

 concentration of muscular force and a partially rigid or 

 chitinous peduncle. 



Ibid. (p. 366). 



Flustrella dichotoma, von Suhr (sp.). 



In his ' Challenger ' Report (pt. i. p. 48) Busk removes 

 this species from the genus Farciminaria, in which he at first 

 placed it, but still ranks it in his family Farcimiuariadse. He 

 adopts the generic name Verrucidaria, conferred upon it by 

 V. 8uhr, who regarded it as a Fucus. 



My examination of Australian specimens has led me to 

 regard this form as allied to the Ctenostomata rather than to 

 the Cheilostomata. The orifice of the zooecium closely re- 

 sembles that of the Flustrellidse, being bilabiate and, so far as 

 I could determine, agreeing in all essential characters with 

 that of Flustrella. 



In the latter genus the setose operculum is inconspicuous, 

 and I was unable to detect it in spirit-specimens of the present 

 form. 



Whatever may be the exact systematic position of this 

 species, I can see no reason for ranking it amongst the 



* Ann. & Mag. Nat. ffist. for October 1880, p. Ill, pi. xv. figs. 12-14. 

 Ann. <& Mag. N. Hist. Ser. 6. Vol. xii. 11 



