60 MR. A. W. WATERS ON 
know whether it should be placed with JL. monostachys, B., or 
MM. catenularia, Jam. The lower part of the zocecia is not con- 
tracted to the extent usual in I. catenularia; the margins, 
however, cau scarcely be called thin and slope inwards. The 
surface of the zocecium is nearly smooth with but slight tendency 
to form ridges. The opercular flap is large and very noticeable 
in balsam specimens, as it is less transparent than the membrane 
covering the rest of the opesium. 
There are 10 tentacles, while there are 12 in IZ. pilosa. 
Loc. Jackson-Harmsworth Expedition: Ginther Sound, 10 
fath.; off Elmwood, 18 fath.; nr. Wilczek Land, 127 fath. 
15. MemBrantpora LInEATA (L.). 
Membranipora lineata, Hincks, Brit. Mar. Polyzoa, p. 143, pl. xix. 
figs. 3-6; Waters, Linn. Soc. Journ. vol. xxvi. p. 678, pl. xlvii. fig. 11, 
pl. xlviii. fig. 9. For synonyms compare Miss Jelly’s Catalogue. 
Although this is widely distributed im the Arctic seas, I have 
only seen small pieces, which could not be used for study. 
There are 13 tentacles. 
Loc. Britain, Florida, Azores, Scandinavia, Spitzbergen, Fin- 
land, Greenland, Iceland, Davis Straits, Labrador, Kara Sea, 
Novaya Zemlya, Barents Sea, Jan Mayen. 
Jackson-Harmsworth Expedition: off Elmwood, 18 fath.; 
mr. Wilezek Land, 127 fath.; off glacier between Cape Gertrude 
and Cape Flora, about 127 fath.; off Cape Mary Harmsworth, 
53-98 fath.; lat. 77° 55' N., lone. 55° 25’ H., 115 fath. 
16. MEMBRANIPORA ARCTICA (d’O7b.). 
Reptoflustrina arctica, d’Orb. Pal. Fr. vol. v. p. 582. 
Membranipora Sophie, Busk, Q. J. Micr. Sc. vol. ii. p. 255, pl. i. fig. 7 
(1855) ; Ridley, Ann. Mag. Nat. Hist. ser. 5, vol. vil. p. 446, pl. xxi. fig. 2. 
Membranipora lineata, f. Sophie, Smitt, “ Krit. Fort.” 1867, pp. 865 & 
394, pl. xx. figs. 24, 25. 
Membranipora arctica, Lorenz, Bry. von Jan Mayen, p. 85, pl. vii. fig. 1; 
Nordgaard, Bergens Museums Aarbog, 1894-5, p. 17; Bidenkap, Bry. 
Ost-Spitzbergen, p. 620. 
In my paper on Membraniporide in this Journal, vol. xxvi. 
p- 680, I suggested that it would be better to retain the name 
M. Sophie and keep arctica for the Semiflustrellaria arctica of 
d’Orbigny ; but as Bidenkap had, about the time my paper was 
written, made a species IZ. spitzbergensis for the Semiflustrellaria 
arctica, we must follow him. 
There are three Membranipore which received the name 
