GENERA ATSTD GROUPS OF THE ECHINOIDEA. 97 



either some or all the radial plates entering the periproctal ring, 

 or the system is compact. Ornamentation raised, costulate or 

 reticulate, with or without sutural furrows ; sutural pits absent. 



Subfamily TemnopleurincB (p. 106). 



Tumid or spheroidal tests with a compact apical system, the 

 sutures grooved and pitted, "undermined" or not, the plates 

 highly ornamented and united by dowelling. 



Subfamily GlyphocypTvincd. 

 This subfamily may be divided artificially, into genera with large 

 apical systems into the ring of which some radial plates enter, and 

 into genera with solid apical systems. 



Genus Glyphocyphus, 

 Dictyopleurus. 

 Arachniopleurus. 

 Ortholophus. 

 ParadoxecMnus. 

 Echinocyphus. 

 Zeuglopleurus. 

 Lepidopleurus. 

 Leiocyphus. 

 Coptophyma. 



G-enus Glyphocyphus, J. Saime, 1853, Anim. foss. de VInde, 

 p. 208. Desor,l^?>^, Synopsis, -^.102. Cot feau, 1859, Ech. 

 du Dept. de la SartJie, p. 158, pi. xxviii. ; 1862-67, Pal. 

 Frang., Terr. Gret. vol. vii. p. 531 ; Bull. Soc. Zool. de 

 France, 1886, p. 86. Duncan ^ Sladen, 1882, JPal. Ind. 

 ser. xiv., Foss. Ech. W. Sind, p. 36. 



Test small, more or less tumid at the ambitus, broader than 

 high, depressed spheroidal. Coronal plates moderately nume- 

 rous. Epistroma highly developed. 



Apical system large, all the basals and radial plates entering 

 a narrow periproctal ring ; madreporite small, punctures dis- 

 tinct ; pore of the radial plates adoral ; periproct large, elongate, 

 ovoid. 



Ambulacra narrow, straight, with two vertical rows of small, 



LI]ST«r. JOUBN. — ZOOLOGY, TOL. X5III. 7 



