REPORT OX THE HEXACTIXELLIDA 



4i: 



LII. SCOPULARIA. 



Tlie dictyonal framework exhibits a honeycomb-like 

 structure ; the wall of the cup or tube-like skeleton 

 is regularly traversed by hexagonal parietal apertures 



(il£LITTIOSID;E), ..... 



The dictyonal skeleton exhibits no such honeycombed 

 structure, ...... 



LIII. ^lELiTTioNn).E, with the single genus AphrocalHsles, Gray 



The body consists of a dichotomously branched tube, 



The body has the form of a cup with lateral diverticula, 



1 The traverse lateral diverticula of the cup-shaped body 



are flat and pouch-like, and disposed perpendicu- 

 larly. The parenchyma contains no oxy-, but only 

 disco- and sphaero-hexasters, 



The lateral diverticula are glove-finger-shaped. The 

 parenchyma contains oxj'hexasters, 



2 The oxyhexasters of the parenchyma are all much 



elongated in a longitudinal direction. The four 

 principal rays at right angles to the latter, remain 

 simple and short, ..... 



The oxyhexasters of the parenchyma are, for the most 

 part, uniformly stellate. Some sphaerohexasters 



PAGE A!n) PLATE 



occur, ...... 



LIV. Body plate or cup-shaped. The dictyonal framework 



exhibits regularly alternating, straight, or funnel- 

 shaped passages, belonging to the afferent and 

 efferent canals, which penetrate the body wall 

 transversely (CosciNOPOBiDiE), 



The dictyonal framework does not exhibit regularly 



alternating, straight, afferent and efferent passages, 



traversing the wall, .... 



LV. CosciNOPOEiD^, Zittel, with the single genus Chonelasma, F.E.S. 



The body has a flat tabular form. 



The body has the form of a cup with lateral thimble- 

 like diverticula, ..... 



LYI. 



The dermal skeleton contains strongly developed 

 pentacts, without rudiment of a sixth distal ray, 

 and with tangential rays beset with spines on the 

 outer surface, ..... 



LIII. 

 LIV. 



Aphrocallistes ramosus, . 317 



LXXXVI. 



1 



Aphrocalligtes vagtus, . 315 



LXXXV. 



Aphrocalligtes heatrix, . 309 



LXXXIV. 



Aphrocalligtes hocagei, . 311 



LXXXni., LXXXIV. 



LV. 



LVII. 



LVI. 



Chonelasma falyj-, . 324 



LXXXIX. 



Clionelagma lamella, . 319 

 Lxxxvu., Lxxxvni. 



Hexacts occur in the dermal skeleton, with a short 

 distal laterally spinose ray, ... 1 



1 The parenchyma contains discohexasters, with long 



rough principal rays, and short S-sbaped terminals, Chonelatma hamatum. 



321 



SCI. 



(ZOOL. CHALL. EXP. — PART LIII. — 1887.) 



Ggg53 



