868 THE VOYAGE OF H.M.S. CHALLENGER. 



Species 1. Holascus stcllatus, n. sp. 



Priucipalia arc oxypeiitacts with distal radial ray, or rarely oxyhexacts. The paren- 

 (;hyma includes oxyhexasters, some with straight, and others with long curved terminals. 

 Graphiohexasters and probably discohexasters also occur. The hypogastralia resemljle 

 the hypodermalia. Buenos Ayres, 2650 fathoms. 



Species 2. Holascus Jibulatus, n. sp. 



The principalia are oxytefcracts. Small oxyhexacts more externally. The paren- 

 chyma includes, besides' the oxyhexasters, numerous markedly curved two- (or frequently 

 three-) rayed fibulae. The gastralia are oxypentacts without inwardly projecting radial 

 ray. South of Australia, 2600 fathoms ; west of Crozet Islands, 1375 to 1600 fathoms. 



Species 3. Holascus polejacvii, n. sp. 



The principalia are oxyhexacts with long, sometimes curved, tangential rays. The 

 parenchyma contains, besides the simple oxyhexasters, other forms in which the principal 

 rays are externally thickened, and bear tufts of strongly developed terminals. The 

 gastralia are somewhat large oxypentacts without freely projecting radial ray. South 

 of Australia, 1950 fathoms. 



Species. 4. Holascus ridleyi, u. sp. 



The principalia are substantial oxytetracts. The parenchyma includes, besides the 

 ordinaiy oxyhexasters, other forms in which the principal rays are much thickened 

 externally, and bear tufts of strong terminals. Simple oxyhexasters with curved terminal 

 rays have also an occasional occurrence. The gastralia are slender oxyhexacts. Philip- 

 pines, 2225 fiithoms. 



Genus 2. Malcosaccus, n. gen. 



Sack-like or tubular forms with loose walls, externally somewhat smooth, and internally 

 honeycoml^ed. The principalia are oxyhexacts with very long, thin, pliable tangential 

 rays. The hypodermalia and hypogastralia are sword-shaped hexacts with rough pro- 

 jecting ray, which perhaps bears a floricome. 



Species 1. Malacosaccus vastus, n. sp. 



The parenchyma contains oxyhexasters with very fine long terminal rays, and small 

 discohexasters with many terminals on the transverse disc-shaped terminal expansion 

 of each principal ray. West of Crozet Islands, 1375 fathoms. 



