72 MR. A. W. WATERS ON 
of Membranipora; but the genus is described as without avicu- 
laria, though we have often seen that it is dangerous to make the 
absence of avicularia a generic character: in fact negative cha- 
racters are not often to be relied upon. At present there 
does not seem sufficient reason for placing the palmata of Sars 
under Cyclicopora, and therefore the name given by Bidenkap is 
retained. Stimpson may have had this species before him ; but as 
the description appears quite insufficient for recognition, and 
might almost as well be applied to some other species, it seems 
only right to retain the name given by Sars, as he clearly 
described it. 
The form which Hincks described (loc. cit. pl. viii. fig. 1) with a 
distinct sinus in the aperture, and with semicircular avicularia, 
can hardly remain with this species. 
There are two large rosette-plates near the basal wall and 
several (6-8) on the lateral wall. I have not found any oral 
or avicularian glands. There are 18 tentacles. A specimen from 
lat. 77° 55’ N., long. 53° 20' E., has the peristome raised at the 
side, but this does not occur in any of the other specimens. 
The zoaria, according to Vigelius, may be uni- or bilaminate, 
but I have only seen them bilaminate. 
Loe. Spitzbergen (Smitt g Biden.), Greenland, Kola (Sm.), 
Barents Sea (Hincks), Matotschkin Schaar (Sm. & Stuaxb.), Kara 
Sea, Jan Mayen (Lorenz); lat. 79° 13' N., long. 68° 21’ E., 
230 met. (Marenzeller); Norway (Nordgaard); St. Lawrence 
(Hineks) ; New Brunswick (Stimpson). 
Jackson-Harmsworth Exp.: off glacier between Cape Flora 
and Cape Gertrude, 30 fath.; off Cape Gertrude, 30 fath.; 
lat. 77° 55’ N., long. 53° 20’ E., and long. 53° 16! E., 130 fath. 
29. LEPRALIA SINCERA (Sm7tt). (PI. 8. fig. 2.) 
Discopora sincera, Smitt, “ Krit. Fort.” 1867, p. 28, pl. xxvii. figs. 178- 
130. 
Lepralia sincera, Hincks, Ann. Mag. Nat. Hist. ser. 4, vol. xix. p. 102, 
pl. xi. fig. 2; Lorenz, Bry. von Jan Mayen, p. 88; Hennig, (fvers. 
Vetensk.-Ak. Foérh. 1896, p. 357. 
Discopora reticularis, Van Beneden, Recherches sur les Bry. de la Mer 
du Nord, Bull. Acad. Roy. Belg. vol. xvi. p. 652, pl. ii. figs. 15-18. 
Hemeschara sincera, Busk, Journ. Linn. Soc., Zool. vol. xv. p. 237. 
Mucronella sincera, Nordgaard, Bergens Mus. Aarbog, 1894-5, p. 29, 
pl. i. fig. 6; Bidenkap, Bry. von Ost-Spitzbergen, Zool. Jahrb. vol. x. 
p. 625. 
