[LAMBE] SPONGES FROM COAST OF NORTHEASTERN CANADA 35 
7. Linear spicules.—Scattered among the large oxea, at right angles 
to the surface, in small numbers; generally broken but over ‘657 mm. 
in length with a thickness of ‘002 mm. 
8. Oxea of the oscular fringe—Over 2 mm. in length and about 
‘006 mm. thick. 
Localities —Cumberland Sound, Kingawa Fjord, 20 fathoms, sandy 
bottom, A. M. Rodger, 20th of August, 1892, three specimens; Davis 
Strait, off Cape Raper, 4 miles 8., 60 fathoms, bottom of stones and 
sand, A. M. Rodger, 13th of September, 1892, four specimens. 
HETEROPIA RODGERI. (Sp. nov.) 
(Plate VI, figs. 13, 13a-g.) 
* Sponge erect, solitary, nearly cylindrical, increasing slightly in dia- 
meter from the base to near the oscular opening which is devoid of a 
fringe. Surface even. Texture firm. Wall about ‘3 mm. through. 
Gastral cavity large, terminating above in a wide osculum. Attaining 
a length of about 1 cent. with a diameter near the upper end of from 
1°5 to 2 mm. 
Skeleton—Composed of the following spicules,—gastral quadrira- 
diates, gastral triradiates, subgastral triradiates, tubar triradiates, sub- 
dermal triradiates, dermal oxea longitudinally disposed, and linear 
spicules at right angles to the dermal surface. 
1. Gastral quadriradiates—With sharply pointed rays, the apical 
ray being much stouter than the others; length of rays, parallel to the 
gastral surface, ‘104 mm. with a thickness of ‘006 mm., size of apical 
ray ‘229 by ‘013 mm. These spicules are not numerous. 
2. Gastral triradiates—Occurring longitudinally, more or less in 
fascicles, parallel to the gastral surface. Sagittal, with rays lying in the 
same plane and tapering to a sharp point; basal ray very long measuring 
about ‘425 by ‘006 mm., lateral rays curved toward the basal ray, about 
‘104 mm. long and ‘006 mm. in diameter. 
3. Subgastral triradiates.—Sagittal; all rays of the same thickness, 
lateral rays lying slightly out of the plane of the basal ray, almost straight 
or curving a little toward the basal ray; lateral rays measuring about 
‘111 by ‘006 mm., basal ray -189 mm. long. These spicules have their 
basal rays reaching across the wall to the lateral rays of the subdermal 
triradiates. 
4. Tubar triradiates—Similar in shape to the subgastral triradiates 
but generally rather smaller with a proportionately shorter basal ray. 
Occurring in small numbers at different levels farther removed from the 
gastral surface than the subgastral triradiates. 
