374 THE VOYAGE OF H.iM.S. CHALLENGER. 



Family III. E o s s E L l i d ^, F. E. S. 

 The dermalia are always without a distal radial ray. 



Genus 1. Lanuginella, O. Schmidt. 



With the single species, Lanuginella pupa, 0. Schmidt. 



The body forms a cocoon-shaped, thick-walled sack with superior circular aperture, 

 and is directly attached by its blunt lower end. The parenchyma contains delicate 

 discohexasters, plumicomes, and small discohexasters with numerous terminal rays on 

 the broad terminal discs of the principals. Cape Verde Islands ; Little Ki Island, 140 

 fathoms. 



Genus 2. Polylophus, n. gen. 



With the single species, Polylaphus philipinnensis (Gray). 



The cup-shaped, thick-walled body, provided with a wide circular oscular aperture, is 

 rooted in the mud by means of a basal tuft. The external surface bears spherical 

 papillae, from the rounded summit of which a tuft of long pleuralia projects. From the 

 papillae buds are frequently developed. The parenchyma contains numerous oxy- 

 hexasters with long rough principal rays, each with three long markedly diverging 

 terminals. Single plumicomes also occur. In the skin, above the medium-sized hypo- 

 dermal oxypentacts, there lie small, rough, somewhat incurved, cruciate autodermal 

 tetracts. The pleuralia and basalia pass inferiorly into anchors with four slightly curved 

 transverse teeth. Little Ki Island, 140 fathoms. 



Genus 3. Rossdla, Carter. 



Thick-walled goblets of an egg- or barrel-like form, with circular oscular aperture 

 and deep gastral cavity. From regularly distributed small boss-like elevations of the 

 external surface a group of diact and pentact pleuralia project radially outwards, and by 

 the association of their tangential rays form a kind of veil. By a deep but regular and 

 simple folding of the chamber layer, alternating afferent and efferent, narrow, funnel- 

 shaped, radial canals are formed. The parenchyma contains oxyhexasters with very 

 short principal rays and various discohexasters. In the dermal membrane rough pentacts 

 almost exclusively occur. 



Species 1. Rossella antarctica, Carter. 



Elongated egg- or barrel-shaped forms, firmly fixed or rooted among small stones by 

 means of short processes. The tangential rays of the pleural pentacts are so displaced to 



