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



consists of several layers, so that the outermost ends of the tulies never exhiljit (as in 

 Farrea) a single-layered network of beams. 



Genus 1. Eurete (Semper), Carter. 



A richly anastomosing framework of approximately uniform tubes, attached at several 

 places to the substratum, and exhibiting numerous oscular apertures. 



Species 1. Eurete semperi, n. sp. 



The oscular terminal apertures of the tubes, which are almost as thick as a little 

 finger, always occur on the free, transversely truncated ends of the numerous stumps. 

 The somewhat irregular dictyonal framework consists of strong beams irregularly beset 

 with few little spines. The beams are united in spherically thickened nodes of 

 intersection, which are richly beset with small tubercles. The parenchyma contains, 

 besides the uncinates and simple oxyhexacts, numerous small discohexasters with 

 short principal rays and moderately long terminals. The dermal scopulse bear on the 

 end of a small conical expansion, four (less frequently five or six) cruciately disposed 

 smooth, spindle-shaped prongs. The gastral scopulae have four cruciately disposed 

 prongs, in which the thin outward bent stalk ends in a club-shaped swelling, which 

 is covered on to the smooth apex with small barbs. Near the Little Ki Island, 140 

 fathoms. 



Species 2. Eurete schmidtii, n. sp. 



A somewhat narrow-meshed system of anastomosing tubes which measure about 

 5 mm. in width. The meshes of the dictyonal framework are predominantly square, and 

 consist of smooth or slightly spinose beams with slightly thickened moderately spinose 

 nodes of intersection. The parenchyma contains, besides the variously disposed 

 uncinates, small rough oxyhexacts and oxyhexasters with short principal rays, each with 

 two terminals. Most of the dermal scopulse bear on the distal end of the inferiorly 

 pointed smooth stalk, a knotted swelling, with two to four smooth, pointed terminal 

 prongs, while the others exhibit a thickening with four prongs with thin stalks and pear- 

 shaped terminal knobs with lateral barbs. The gastral scopulee belong exclusively to the 

 latter type. Philippines, 102 fathoms; Japan. 



Species 3. Eurete farreopsis, Carter. 



The irregularly anastomosing system exhibits tubes 4 to 5 mm. in width, and some- 

 what wider intermediate spaces. The nodes of intersection of the predominantly square- 



