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



chyma small oxyhcxacts, oxyhexasters, and discohexasters occur. The pinuli are for the 

 most part pentaets. West of Portugal, Morocco aud Scotland, 200 to 400 fathoms. 



Genus 2. Aulascus, n. gen. 



With tlie single species, Aulascus joh^istoni, ii. sp. 



Tubular form. The principalia are oxyhexacts and diacts. Between these in the 

 parenchyma discohexasters and single plumicomes occur. On the dermal and gastral 

 pinuli the ray turned towards the parenchyma is more or less developed. Prince Edward 

 Islands, 310 fathoms. 



Subfamily 2. Sympagellin^, F. E. S. 



Ovoid, thick- walled, usually (or always?) stalked goblets with smooth, thin superior 

 margin. The parenchyma between the principal hexacts and diacts contains small 

 discohexasters. 



Genus 1. Sympagella, 0. Schmidt. 



With the single species, Sympagella nux, 0. Schmidt. 



On the terminal branches of a ramified stock ellipsoidal goblets are borne. The 

 parenchyma contains, besides isolated plumicomes, numerous discohexasters with two to 

 four delicate terminal rays on each principal, and also small elongated stars. Florida, 

 98 to 123 fathoms; coasts of Spain and Portugal; Cape Verde Islands, 100 to 128 

 fathoms. 



Genus 2. Polyrliahdus, n. gen. 



With the single species, Polyrhahdus oviformis, u. sp. 



Unstalked (?). Egg-shaped goblet slightly narrowed superiorly. The dermal pinuli 

 are hexacts with thick scaly distal ray. The parenchyma contains discohexasters with 

 numerous terminal rays. South Indian Ocean, 1975 fathoms. 



Genus 3. Balanites, n. gen. 



With the single species, Balanites pipetta, n. sp. 



Obliquely stalked. The parenchyma contains numerous small discohexacts. The 

 dermal and gastral pinuli are hexacts with compressed, scaly, freely projecting ray. On 

 the superior oscular margin they are directly continuous. Besides the small discohexacts, 

 the parenchyma also includes discohexasters with long principal rays, which bear a 

 tuft of short terminals. South Indian Ocean, 1950 fathoms. 



