402 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



process is a large afferent canal, which has the flattened shape of the 

 process and extends deep into the sponge body, branching as it 

 goes. The surface of the crateriform cavity is folded so as to give 

 rise to maeandriform ridges about 5 mm. high and 2-3 mm. wide. 

 Numerous and relatively large efferent canals, 5-6 mm. in diameter, 

 lead into the crateriform cavity; their apertures covered by the 

 dermal membrane of this cavity ; the canals radiating as cylindrical 

 tubes deep into the sponge body. 



The skeletal framework includes reticular lamellae like those of 

 the type (see previously), but coarser, the meshes measuring 175-350 

 |x in width; spiculo-fibers composing the lamellae about 150-175 jji 

 thick along with thinner and looser spicule tracts. The lamellae 

 are 1-2 mm. apart, in the superficial regions roughly parallel to 

 the outer and inner surfaces of the sponge; in the interior they 

 are, sometimes at least, arranged concentrically to the larger canals. 

 The skeleton between the lamellae may be the usual coarse, irregular 

 one, but in places there is found a system of straight pillar-like 

 spiculo-fibers, about 150-200 [i. thick and 0.5 to 2 mm. apart, which 

 run from lamella to lamella, vertically to them; between the pillar- 

 like fibers there is only a very scanty, irregular, reticulum. 



The dermal skeletal reticulum of the outer surface is made up 

 primarily of spiculo-fibers about 175 y. thick, between which stretch 

 thinner looser spicule tracts, composed often of only two or three 

 spicules; meshes 175-350 \i wide. Skeletal reticulum of the inner 

 surface about the same, perhaps slightly coarser (in the Albatross 

 specimen of the type, see above, it is somewhat finer. The relation 

 is probably a point of individual variation). 



The spicules (pi. 48, fig. 8, a) are sharp-pointed oxeas, 400-440 by 

 22 [x. They are thus somewhat larger, and differ in respect to the 

 apices from the specimen of the type, described above. But the 

 precise shape of the apex, as the other specimens of the variety show, 

 is a matter of individual variation. 



The specimen from station D5253 (pi. 40, fig. 5) represents about a 

 fourth of a larger but similar sponge. In this sponge the diameter 

 was about 400 mm., height 200 mm.; the crateriform cavity, as in the 

 other specimens of the variety, relatively very small. The fistular 

 processes and included canals are larger, especially in that cross di- 

 ameter which represents a meridional plane of the sponge. The 

 spicules (pi. 48, fig. 8b) agree with those of the first specimen, except 

 that they are rounded at the apices, thus not differing from the char- 

 acteristic spicule in the Albati*oss specimen of the type. 



The specimen from station D5249 (pi. 41, fig. 2) is complete. It is 

 the smallest of the three, the horizontal diameter being about 200 

 mm., the height 140 mm. The cavity is 90 mm. wide and 60 mm. 

 deep. The sponge is intermediate in habitus between the type and 



