3° 



ECHINOIDEA. I. 



No end-tooth; no limb on the stalk. Small pedicellariæ with end-tooth and large, not terminal 

 opening. Tridentate pedicellariæ ?, spicules ?. Spines extended in a more or less flower-like way, trace 

 of basal widening. 



Species: P. florigera (A. Ag.). 



Distribution: The Philippines (Chall. st. 204) (or New Guinea; Cliall. st. 192). vSublittoral. 



Phyllacanthus Brandt (emend.). 

 Synonym: Leiocidaris Desor. 

 Large globiferovxs pedicellariæ with small terminal opening; no end-tooth; the blade prolonged 

 in a snout-like way. Limb on the stalk? Small pedicellariæ with end-tooth. Tridentate pedicellariæ 

 with the blade filled by a close reticulation forming irregular longitudinal ridges closely set with teeth. 

 Spicules simple. Spines large and thick, finely striated. 



Species: Ph. imperialis (Lamk.), (?) diibia Brandt, (?) parvispina Woods. 

 Distribution: The Red Sea, the Indian Ocean, Australia. Littoral forms. 



Histocidaris n. g. 



Large globiferous pedicellariæ unknown; small pedicellariæ with two rather strong end-teeth (?). 

 Tridentate pedicellariæ of a larger and a smaller form; the blade of the large ones is filled by a 

 ricli net of meshes, the holes of wliich are rather distinctly arranged in series, and radiate in a fan- 

 shaped way from the upper end of the apophysis; numerous small thorns on the inner surface of the 

 blade, especially towards the point; also the apophysis is broad and fuU of holes. The smaller form 

 simple. Spicules simple. Spines long and slender. 



Species : H. ckgans (A. Ag.). 



Distribution: Australia (New Guinea, the Philippines). Archibenthal. 



Porocidaris Desor. 

 Only large two-valved pedicellariæ. The spines with very long neck. Spicules simple. 

 Species: P. piirpiirata W. Thoms. 

 Distribution: The Northern Atlantic. Archibenthal. 



I) IC er fer s c dis : 

 Dorocidaris paiiainciisis Ag. 



— tiara Anderson. 



— alcocki — 

 Stcrrocidaris tcnuispimis Yoshiw. 



— 111 icrotubcmilatus Yoshiw. 



Porocidaris vnsakiensis — 



— Sharreri Ag. 



— Milleri — 



— Cobosi — 



— gracilis Doderl. 



Phyllacanthus australis Ratiisay. 

 Goniocidaris Doderleini Ag. 



