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 form 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 i. p. 41). While I agree with him in his decision on 
this point, I am quite unable to follow him when he proceeds 
to aaa 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 the genus Sarentsia 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 tact it never was defined 
until Barentsiea 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 Harciminaria, in which he at first 
placed it, but still ranks it in his family F arciminariada, He 
adopts the generic name Verrucularia, conferred upon it by 
v. Suhr, who regarded it as a Hucus. 
My exainination of Australian specimens has led me to 
regard this form as allied to the Ctenostomata rather than to 
the Cheilostomata, The orifice of the zocecium closely re- 
sembles that of the Flustrellidie, being bilabiate and, so far as 
I could determine, agreeing in all essential characters with 
that of Plustrella. 
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. Hist. for October 1380, p. 277, pl. xv. figs. 12-14, 
Ann. & Mag. N. Hist. Ser. 6. Vol. xii. 11 
