74 LAWEENCE M. LAMBE ON SOME 



The writer has much pleasure in associating with this sponge the name of Dr. Greorge 

 M. Dawson, to whom science is indebted for so much new information relative to the 

 marine invertebrate fauna of the Pacific coast of the Dominion. 



LocalUy. — Off the mouth of Qualicum River, Vancouver Island, in forty fathoms, sand 

 and gravel, ones pecimen (figured). Strait of Georgia near Comox, Vancouver Island, in 

 forty fathoms, two specimens, about 90 mm. in length, with some fragments. 



Aphrocallistes "Whiteavesianus. (Sp. nov.) 



(Plate III, fig. 11 and Plate VI, figs. 3, 3a— n, 3p.) 



Sponge funnel-shaped or forming subcyliudrical ramifications (Plate III, fig. 11). 

 In the specimen figured, -which is unfortunately damaged above, the breadth increases 

 gradually from a narrow base which has a diameter of 9 mm. and a very small surface of 

 attachment, to the upper extremity, the maximum diameter of which is 45 mm. 



Skeleton. — (Plate VI, fig. 8.) Composed of a regular, honeycomb like, dictyonal 

 framework with rough beams which are connected together without much thickening at 

 their intersections. The meshes are for the most part quadrangular but sometimes triangular 

 or irregular in shape. The reticulation is much more regular in the dermal part of the 

 skeleton than in the gastral. From the intersections of the framework, stout, sharp 

 pointed continuations of the beams frequently project. These are longest near the gastral 

 surface and curve inward toward the interior of the skeleton. The wall of the cup is 

 about 5 mm. thick and the radial six-sided canals which traverse it have an average 

 diameter of •*75 mm. 



Spicules. — Eough hexacts with strongly spined distal rays (pinuli) in the dermal 

 skeleton (Plate VI, fig. 3a.) The distal ray varies considerably in size and shape. It 

 may be long and thick, set with large spines : short, stout with few spines : or almost 

 devoid of spines and similar to the four tangential rays. In some cases the proximal ray 

 is very much developed (Plate VI, fig. 3b.) The average length of the pinuli, measuring 

 from the upper end of the spined distal ray to the lower end of the proximal ray is 0"34Y 

 mm. Besides the pinuli there arc numerous scopulœ which seem to assume two distinct 

 shapes ; (a) a stout, rough form (Plate VI, fig. 3c), averaging 0'366 mm. in length, with 

 seldom more than four knobbed prongs and {b) a smaller, almost smooth form with an 

 average length of OSOY mm. (Plate VI, fig. 3d), with about six rather slender, slightly 

 divergent, knobbed prongs. Both these forms have sharp pointed shafts. The unciates 

 are long, slender and regularl}^ spined (Plate VI, figs. 3e, 3e', 3f), their maximum length 

 being 2'03 mm. The other parenchymalia are : [a) rough hexacts having an average dia- 

 meter of OlST mm., with robust rather sharp pointed rays (Plate VI, fig. 3g). A few 

 rough tetracts with straight raj^s and rough hexacts with slender, slightly ciirved rays 

 are present (Plate VI, figs. 3i, 3h) and are possibly modifications of the hexacts ; {b) 

 smooth hexacts having an average diameter of 0'06 mm. with stout, sharp pointed rays 

 (Plate VI, fig. 3j). These frequently develop a variable number of rays, sometimes as 

 many as sixteen or eighteen and are often of large size. The one represented on (Plate 

 VI, fig. 3k), has a diameter of 0091 mm. and the largest one seen, which has a diameter 



