78 PROCEEDINGS OF THE NATIONAL MUSEUM vol.81 



surface is entirely rough, the roughness being uniformly distributed 

 on the entire surface. 



The gastralia consist chiefly of rough hexactins. The paratan- 

 gentials mostly measure TOjU, long from the spicular center and 8/^ 

 thick at the base. The distal ray is nearly as long as, or somewhat 

 longer than, the paratangential of the same spicule, while the prox- 

 imal ray is usually longer, 105;u to 120/x. in length. The rays taper 

 perceptibly toward the conically pointed end ; their entire surface is 

 quite uniformly rough. 



The hexaster, the oxyhexaster^ and hemihexactinic forms are of 

 frequent occurrence in all parts of the entire stock. Their axial 

 length varies from CO/x to 80/i. The very thin and delicate terminals 

 •of the normal oxyhexaster are about 1/i, thick at the base and diverge 

 widely; the principals are distinct and thick. The hemihexactinic 

 form is robuster, measuring 100/^ in diameter; and the terminals 

 are stronger and the roughness is more pronounced. It occurs mostly 

 in the parenchyme, intermingled with the normal oxyhexaster and 

 is more numerous than the latter. 



The macrodiscohexaster shows a sunlike appearance, nearly like 

 that occurring in other members of this genus. It varies in diameter 

 from 680/i, to SSOju. The axis of the central sphere measures Mfi. 



The microdiscohexaster shows two kinds ; the larger one is nearly 

 similar to that occurring in A. mitsukurii Ijima and measures 80/a 

 in diameter, with straight, strong terminals and with distinct prin- 

 cipals lOju, long. The smaller one shows a delicate structure with 

 a diameter of 40)ii to 50|U,, nearly the half of the former. It occurs 

 chiefly in the dermal layer. 



Remarks. — Our new subspecies closely resembles A. flssuratus in 

 general spiculation, but differs from it in having a larger macro- 

 discohexaster and in the appearance of the microdiscohexaster. 



AULOSACCUS ALBATROSSI, new species 



Figure 9 ; Plate 5, Figure 3 



The larger, complete specimen A (holotype, U.S.N.M. No. 22111), 

 upon which I base this description, is exquisitely vaselike, being 

 broadest in the upper fourth of its length and gradually narrowing. 

 The total length is 182 mm ; greatest breadth, about 120 mm. The 

 osculum is nearly circular, with a diameter of approximately 45 mm. 

 The wall in the middle of the entire body is 12 mm thick; in the 

 oscular margin, 2 mm. The greater part of the dermal skeleton has 

 • fallen off. Where it is preserved it shows a delicate dermal layer, of 

 which the latticework is perceptible with the naked eye. The par- 

 enchymal mass, exposed to the eye on the ouside, presents as the re- 



