[LAmBE] SPONGES FROM COAST OF NORTHEASTERN CANADA 25 
to find it in Hudson Bay. Its range includes Behring Sea and Strait, 
Beaufort Sea, the Siberian Arctic Ocean, the Kara Sea, the European 
Arctic Ocean, Barent’s Sea and the sea west from Greenland. 
The Hudson Bay specimen is irregularly pear shaped, higher than 
broad, broader above than below where it has apparently been attached 
to some object; eight 6 cent., greatest breadth a little over 4 cent., 
colour in alcohol a dark grayish-brown, surface rough (except on the 
top where it is comparatively smooth), covered with small irregular ele- 
vations separated from each other by a network of wrinkles or furrows. 
A single osculum, about 8 mm. in width, occupies the centre of the sum- 
mit and in the sides are numerous small openings, having a maximum 
width of about 1 mm., which probably are the entrances to inhalent 
canals. The sponge is soft and yielding to the touch and probably the 
roughness of the surface is exaggerated by shrinkage. The spicules 
agree in size and shape with those of the specimen from Unalaska Island, 
described by the writer in volume xii. of the Royal Society’s Trans- 
actions, in all particulars except that the differentiation of the megas- 
clera into two sizes appears to be less marked. 
TENTORIUM SEMISUBERITES, Schmidt. (Sp.) 
Thecophora semisuberites, Schmidt. 1870. Spong. Atlant. Gebiet, p. 50, pl. vi., 
fig. 2. 
Thecophora semisuberites, Fristedt. 1887. Sponges from the Atlantic and 
Arctic Oceans and the Behring Sea (translation), 
Vega-expeditionens vetenskapliga arbeten, p. 433. 
Tentorium semisuberites, Lambe. 1896. Sponges from the Atlantic coast of 
Canada, Trans. Royal Soc. Canada, second series, 
vol. ii., p. 198, pl. iii., figs. 2, 2a-e. 
Of this species there are two small specimens both adherent to 
pebbles. 
The larger one is from Davis Strait, Erick Point, bearing N.W. by 
W., 10 miles, 150 fathoms, rocky bottom, A. M. Rodger, 24th of October, 
1892: the second specimen is from East Greenland, 250 fathoms, A. M. 
Rodger, 1894. 
The Davis Strait specimen has a height of 17 mm., whilst the other 
is even smaller, measuring only 7 mm. from its base to the top of the 
oscular tube of which in both specimens there is only one. 
This sponge has been already referred to at length, in the writer’s 
previous paper descriptive of Gulf of St. Lawrence and Atlantic sponges. 
