BRYOZOA FROM FRANZ-JOSEF LAND. 59 
12. Frusrra carsasea, Ell. & Sol. 
Smitt considered that this occurs both unilaminate and 
bilaminate, but the latter form has been named Flustra spitz- 
bergensis by Bidenkap*. The specimens brought back by the 
Jackson-Harmsworth Expedition are all unilaminate, and have 
23-24 tentacles. 
Loc. Spitzbergen, Norway, Greenland ; Jan Mayen, Jugor-and 
Matotschkin-Schaar; Gulf of St. Lawrence; British seas: 
Iceland; Rattegat v. Anholl. 
Jackson-Harmsworth Expedition: Giinther Sound, 10 fath. ; 
off Kast Glacier on floe ; Cape Flora, nr. Wilczek Land, 127 fath. 
13. FLUSTRA MEMBRANACEO-TRUNCATA, Siitt. 
This throws out many radicle processes, and undoubtedly what 
Nitsche and Hincks called “Thurmzocecia”’ are only these 
processes, and the appearance is often quite similar to the figures 
of these structures, though of course they only occur on the 
dorsal surface, whereas they have been figured as on the anterior 
surface. 
There are 16 tentacles, and 3 distal rosette-plates and 6 
lateral. 
Loe. Spitzbergen, Greenland, Kara Sea, Kola, Jugor- and 
Matotschkin-Schaar, Norway. [Jan Mayen (Wordgaard).| 
_ Jackson-Harmsworth Expedition: Cape Mary Harmsworth, 
53-93 fathoms. 
Besides the above two species of Flustra, the F’, securifrons, 
Pall., has been found in the Kara Sea; the F. serrulata, Busk, in 
the Kara Sea, from West Greenland, and from Franklin Pierce 
Bay ; F. abyssicola t, Sars, has been found off Novaya Zemlya. 
14. MemBranipora mMonostacuys, Busk. (PI. 8. fig. 3.) 
Membranipora monostachys, Busk, Brit. Mus. Cat. pt. 2, p. 61, pl. Ixx. 
figs. 1-4. 
Hippothoa rugosa, Stimpson, Invert. of Grand Manan, 1863, Smith- 
sonian Cont. p. 18, fig. 9. 
A specimen from near Wilczek Land has the blind cells which 
were mistaken by Busk for avicularia, and they seem to be 
formed when growth is arrested by any cause, such as meeting a 
neighbouring branch. ‘There are no spines, though there are 
indications of a central spine in some zocecia ; and it is difficult to 
* Bryozoen von Ost-Spitzbergen, p. 617, pl. xxv. figs. 1, 2. 
+ I regret that when describing F. separata, Waters, from off Nova Scotia 
in the Suppl. Rep. of the ‘ Challenger’ Polyzoa, Chall. Zool. vol. xxxi., I.did not 
recognize that it was Ff. abyssicola, Sars. 
