252 



dermal spicules, are visible as streaks that cross one another irregu- 

 larly. Openings of afferent and efferent canals visible as round aper- 

 tures with diameter under 2 mm. 



Principal parenchymals are long diacts arranged in loose strands. 

 There are hypodermal oxypentacts with wavy paratangentials; hypo- 

 gastrally no pentacts are found. Parenchymal microsclerae of two 

 kinds: 1) discohexasters (dia. 0.08 mm) with short principals, each 

 bearing 3 extremely slender terminals that some-what thicken towards 

 the terminal disc, and 2) rough micro-oxyhexacts , semi-oxyhexasters 

 and degenerate oxyhexasters (dia. 0.09 — 0.12 mm), similar to those 

 known from several Possellid species. In what I have called semi- 

 oxyhexasters some rays are simple and exactly occupy the position 

 of a regular hexact-ray, while others are so deeply forked into two 

 diverging terminals that the latter seem to spring almost directly from 

 the central node. One terminal of such a forked ray may often be en- 

 tirely suppressed in development , thus giving rise to degenerate oxy- 

 hexasters as already maintained by F. E. Schulze. 



The autodermals are rather stout pentacts and hexacts with rays 

 0.08 — 0.1 mm long and beset with prongs , of which the more promi- 

 nent ones are turned towards the ends of rays. The similarly pronged 

 autogastrals are exclusively hexacts with the free proximal ray more 

 strongly developed than the rest, so that they might be called hexact- 

 pinules. 



This new genus is probably to be considered as a near ally of -4s- 

 conema , while on the other hand its close affinity to Rossellidae can 

 not be denied. 



Aulosaccus Schulzei n. gen. n. sp. 



This is a new E.ossellid known to me in a single specimen that 

 also belonged to Mr. Owston. It is exquisitely vase-shaped, 450 mm 

 high and broadest at the upper third (about 225 mm). The osculum is 

 irregularly circular, about 150 mm in diameter and with a thin simple 

 margin. The lower end, about 110 mm broad, is cut off. The wall 

 thickens below up to 50 mm. The dermal skeleton had fallen off for 

 the greater part, where the exposed parenchymals present a curly 

 appearance, enclosing comparatively large apertures of afferent ca- 

 nals. Gastral skeleton well preserved, smooth. 



The principal parenchymals are diacts of variable size with rough 

 ends; always loose. Rough micro-oxyhexacts (0.088 — 0.13 mm in dia.), 

 many of which have one or more of the rays bifurcated almost the 

 whole length (semi-oxyhexasters) while others may have less than six 

 rays by reduction, occur in abundance. Micro-discohexasters (of the 



