418 



THE VOYAGE OP H.M.S. CHALLENGER. 



LVI. — continued. 



Tho parenchymal discohexasters have only sborfc 

 principal rays, ..... 



LVII. 



The body consists of a system of branched anastomosing 

 tubes, which form either an irregular feltwork, or 

 the wall of a cup (EuREHDiE, F. E. S.), 



The more or less thick wall of the usually cup-shaped 

 body is traversed by oblique or curved afferent and 

 efferent canals (TRETODiCTYiDiE), 



LVIII 



PAGE AND PLATE 



CJicmelasma doederleinii, 322 



xc. 



LVIII. 



LXIII. 

 LIX. 



LX. 



The tubular feltwork does not enclose a central funnel- 

 shaped cavity. Eurete {Semper), Carter, . 



The anastomosing tubular work encloses a central 

 funnel-shaped cavity, and thus forms the wall 

 of a cup, ...... 



LIX. Eurete, Carter. 



The dermal scopulre have four smooth prongs, with 

 spindle or club-shaped extremities, 



The dermal scopuhc bear smooth pointed prongs, 



The dermal scopulas bear prongs, with club-shaped 

 barbed extremities, . . . .1 



1 The parenchyma contains oxyhexasters whose principal 



rays are about twice as long as the short terminals, Eurete hmeerhanldi , 



The parenchyma contains exclusively hexasters whose 

 principal rays are much shorter than the terminals, 2 



2 The hexasters of tho parenchyma all bear long pointed 



terminal rays, ..... 



Eurete marshalli. 



LX. 



LXI. 



The hexasters of the parenchyma are provided with 



knobs or transverse discs at the end of their terminal 



rays, and are therefore sphsro- or discohexasters, . 



3 Both the dermal and gastral scopulre exhibit a distinct 



break-like bend on the pedicel of the prongs. 



The pedicels of the prongs are not thus bent either in 

 the dermal or gastral scopulfe, but are straight or 

 gently curved. 



The internal surface of the cup-shaped body exhibits no 

 longitudinal ridges on the dictyonal skeleton. The 

 whole body-wall consists of a loose feltwork of 

 thin-walled tubes {Periphragella, Marshall), 



On the internal surface of the somewhat firm dictyonal 

 framework of the cup-shaped body there are distinct 

 fu-m longitudinal ridges {Lefroyella, Wy v. Thomson), 

 Periphragella, Marshall, with the single species. 



Eurete farreopsis. 



Eurete carteri. 



LXI. 



LXIL 

 Periphragella 



297 



LXXIX. 



297 



LXXIX. 



. 295 



LXXIX. 



. 296 



LXXVIII. 



. 299 



LXXX., LXXXI. 



