92 MR. A. W. WATERS ON 
are indistinct traces of a lobular structure and of large cells; to 
the base of this is attached the second or globular part, in which 
there are distinct nucleated cells. This division into two separate 
parts is indicated in the oral glands of many species, and is very 
distinct in a few, as in Lepralia eliminata, Waters. 
Tam very doubtful whether 2. costata should be separated 
from &. scabra, Smitt, and think Lorenz has made more species 
than will stand, but I have not the material for a complete study 
of this Arctic genus. 
Loc. Gulf of St. Lawrence (H.); Jan Mayen (Lor.); Finland. 
Jackson-Harmsworth Expedition: off Cape Gertrude, 30 
fath.; off Cape Mary Harmsworth, 53-93 fath. 
54. RuaaMPHOSTOMELLA PLICATA (Smitt). (Pl. 11. figs. 28, 29.) 
Cellepora plicata, Smitt, “ Krit. Fort.” 1867, pp. 380 & 184, pl. xxviii. 
figs. 189-191; Hincks, Ann. Mag. Nat, Hist. ser. 4, vol. xix. p. 106, 
pl. xi. figs. 3, 4. 
Smittia plicuta, Hincks, Ann. Mag. Nat. Hist. ser. 5, vol. xiii. p. 52. 
Ehamphostomella plicata, Lorenz, Bry. yon Jan Mayen, p. 94; Hincks, 
Ann. Mag. Nat. Hist. ser. 6, vol. iii. p. 426. 
? Cellepora bilaminata, Hincks, Ann, Mag. Nat. Hist. ser. 4, vol. xix. 
Os I salle So ties. Gy C5 
? Rhamphostomella bilaminata, Lorenz, Bry. von Jan Mayen, p. 95, 
pl. vii. fig. 10. 
It is difficult to decide upon the range of variation in Rhampho- 
stomella, but it seems as if the species plicata must stand, and 
R. bilaminata appears like a vigorous growth of the same, though 
the absence of spines may be a ground for separation as a variety. 
At first I named a piece from off Cape Mary Harmsworth 
R. bilaminata, but afterwards put it under FR. plicata.. The 
zocrium of FR. plicata is usually nearly smooth, the peristome is 
much raised, forming a triangular peristomial aperture with a 
spine on each side, and a miuute lyrula within the aperture.’ 
There are oral glands close to the tentacular sheath, and there 
are 17 tentacles. 
Loe. Spitzbergen, Greenland, and Finland (Sm.); Jan Mayen 
(Lorenz); Davis Straits (H.); Gulf of St. Lawrence (4.) ; 
Cumshewa, 20 fath. (Queen Charlotte Islands) (4.). 
Jackson-Harmsworth Exp.: off glacier between Cape Ger- 
trude and Cape Flora, about 30 fath.; near Wilczek Land, 127 
fath.; off Cape Mary Harmsworth, 53-93 fath. 
