88 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.81 



terminals, radiating uniformly in all directions. They have a minute 

 terminal disk, the margin of which shows a row of 2 to 14 small 

 teeth. The terminals always appear to have been regularly arranged 

 in their positions and not situated promiscuously as those of A. 

 schulzei; they usually radiate uniformly in all directions, forming 

 two circles ; the inner circle is always composed of shorter terminals, 

 which stick densely together in great numbers. The longer terminals 

 are arranged sparsely on the outer circle. This spicule is very com- 

 mon in the gastral membrane and fairly so in the endosome and the 

 choanosome, but is not found on the dermal membrane. This can 

 easily be verified with a hand lens. 



The microdiscohexaster (fig. 11, A;), of a delicate nature and with 

 a diameter of 40/x to 45/i,, is common in the parenchyme, hypoderm, 

 and hypogastral layers. It is spherical in shape and provided 

 with exceedingly fine terminals 10/x, to 12/x long. The principals are 

 noticeably broad and form a cross about 18/i in axial length. Their 

 outer ends do not show a distinct disklike expansion but become 

 somewhat broader than the middle of the principals, and in the cen- 

 tral part they are weakly spherically swollen. 



AULOSACCUS PINULARIS, new species 



A single specimen in the collection (Station 4790) has served as 

 the type of this new species (U.S.N.M. No. 22112). In general ap- 

 pearance, this sponge resembles A. schulzei Ijima from Sagami Sea. 

 It is exquisitely vaselike, broadest in the upper third of its length, and 

 gradually narrowed below. The total length of the stock is 135 

 mm; greatest breadth, about 85 mm. Above the broadest portion, 

 the wall curves in more or less to terminate in a much-injured, 

 thin, oscular margin, which may have flared out slightly. The 

 osculum is nearly circular, with a diameter of approximately 55 mm. 

 The w^all in the middle of the upper half is 10 mm thick; in the 

 middle of the lower half, 19 mm. The greater part of the dermal 

 skeleton has fallen off. Where preserved it shows an exceedingly 

 delicate dermal layer supported below by fine hypodermal strands 

 that intersect one another at various angles. The parenchymal mass, 

 exposed by abrasion, presents a somewhat curly appearance. The 

 apertures to the incurrent canals are medium sized or smaller. 



The gastral surface is well preserved. It is lined throughout 

 with a continuous layer of the delicate endosomal skeleton. This 

 consists of a small and irregularly meshed latticework of thin hypo- 

 gastral strands bearing gastralia, which, without forming a con- 

 tinuous layer by themselves, leave the hypogastral meshes more or 

 less freely open. The surface features of 'pimilaris are largely com- 

 mon to all species of the genus. The excurrent canalar apertures are 



