366 



An arched sieve-plate and a thin cufF of varying breadths are pre- 

 sent. The spiral ledges seen on E. asp er g ilium , are, in the present 

 species, cut up into numerous conical, knob-like, lappet -like or irre- 

 gularly shaped protuberances, which coijstitute a very characteristic 

 feature. These protuberances, rather inconspicuous on young indivi- 

 duals, develop with age and may attain the height of 14 mm. The 

 parietal gaps, distributed without much regularity, open in valley-like 

 depressions between the protuberances. The longitudinal and circular 

 beams of spicular fibres , together with oblique bands, are arranged 

 exactly in the way as F. E. Schulze describes for E. Oweni (Challen- 

 ger Report) . As measured on a medium-sized specimen, the rectangu- 

 lar meshes of the body- wall average 3 mm in breadth, and the parietal 

 gaps, about I mm in diameter. 



The principal points peculiar to the present species , with respect 

 to its spicules, are as follows : The spicules around the parietal gap are 

 mostly thick- rayed hexacts with pointed or rounded ends. Those 

 more innerly situated are considerably smaller than those in the peri- 

 phery. The latter are very conspicuous stars, with conical rays 0, 1 — 

 0,12 mm long and 0,04 — 0,05 mm broad at the base. — Diacts usu- 

 ally accompany the distal ray of hypodermalia at the free edge of the 

 cuff and sometimes also at similar positions of parietal protuberances, 

 forming a fringe of projecting needles. — In the parenchyma, large 

 graphiohexasters, such as Schulze figures for E. nodosa (loc. cit.), are 

 of common occurrence. Less frequently are the oxyhexasters (with 

 3 — 4 terminal rays) to be met with. — The basal tuft consists of 

 pronged diacts, whose inferior terminal knob bears a wreath of 5 — 9 

 upwardly directed teeth. Smooth pentact anchors have not been 

 found. — The fusion of parenchymal spicules seems to begin when an 

 individual reaches the length of about 200 mm and then at the lo%ver 

 end of the body-wall. Even in the largest specimen before me, the 

 upper portion shows no trace of fusion whatever. 



E. imperialis was collected at depths of 200 — 300 fathoms, from 

 the muddy bottom of volcanic detritus. E. Oweni probably never occurs 

 in Sagami Bay. 



Hyalonema reßexum sp. no v. 

 The somewhat laterally compressed , funnel-shaped body is very 

 obliquely truncated and the entire zone bordering the oscular margin 

 is reflected outwards , so that the gastral space remains as a concavity 

 widely open towards one side. The gastral surface thus exposed is of 

 oval outline , being longer than broad , and shows numerous round 

 openings (up to 4 mm in diameteri of the exhalent canals. The reti- 



