KEPORT ON THE HEXACTINELLIDA. 



419 



LXII. Lefroyella, Wyv. Thomson, with the single species, 



LXIII. TretodictyidjE, F. E. S., 



Bush-like ramified stock with somewhat solid cylindrical 

 branches, on which annular or spiral zones of in- 

 current and excurrent regions alternate {Sclero- 

 thamnus, Marshall), .... 



Body cup-, tube-, or ear-shaped, .... 

 LXIV. Sderothanmus, Marshall, with the single species, 



LXV. Body surrounded by a leaf-like enveloping capsule 



{Fieldimjia, Sav. Kent), .... 

 Body witliout leaf-like enveloping capsule, 

 LXVI. Fieldingia, Sav. Kent, mth the single species, 



LXVII. The parenchyma contains scopula-like spicules bearing 



numerous prongs with transverse terminal discs 

 springing from a terminal knob on the long pedicel 

 {Cijrf avion, F. E. S.), . . . . LXVIII. 



Body in the form of a ramified, slightly anastomosing 

 tubular feltwork, or of a cup, in which the thick 

 wall is traversed by oblique, or twisted afferent and 

 efferent canals, without scopula-like parenchymal 

 spicules with radial prongs (Hexactinella, Carter), . LXIX. 

 LXVIII. Cyrtaulon, F. E. S. 



The body-wall is supported by a feltwork of plates of 

 the dictyonal framework, which enclose round 

 cavities. The nodes of intersection are here and 

 there thickened, and near the surface of the body 

 beset with warts, .... 



PAGE AND PLATE 



Lefroyella decora, . 301 



LXXXII. 



Cyrtaulon sigsbeei, 



The dictyonal framework forms an irregular network 

 of beams and strands which traverse the cylindrical 

 body. Nodes of intersection without thickening or 

 warts, ...... 



LXIX. Hexactinella, Carter. 



The body consists of a dichotomously ramified feltwork 

 of uniformly wide, here and there anastomosing tubes. 



The body consists of a dichotomously branched tube, 

 the terminal twigs of which exhiljit funnel-shaped 

 expansions, ..... 



The body forms a cap seated on a firm basis, becoming 

 markedly wide, but somewhat laterally compressed, 



LXX. The body consists of a system of thin- walled tubes of 



approximately uniform calibre, with an intermediate 

 system of cavities (JLEANDRosPONGiDiE), . 



331 



XCII. 



Hexactindla ventilabrum, 329 



XCTI. 



LXXI. 



