ECHINOIDEA. I. 



Species: 6". affii/is Phil., Reini Doderl., tribuloidcs Lamk., galapagensis Doderl., metularia Lamk., 

 Thouarsii Val., vt-rticilhtta Lamk., baculosa Lamk. 



Distribution: Cosmopolitan in the warm seas; the Mediterranean, Japan. Littoral - sub- 

 littoral forms. 



Chondrocidaris A. Ag. 



Large globiferous pedicellarise with large, cordate opening, the lower limit of which forms a 

 projecting lip; the opening reaches the point; no end-tooth; no limb on the stalk. Small pedicellarise 

 with a more or less developed end-tooth. Tridentate pedicellariae simple (rather highly dentate). 

 Spicules simple. 



Species: Ch. gigantca A. Ag. 



Distribution: The Sandwich Islands, Mauritius. Littoral. 

 Acanthocidaris n. g. 



Large globiferous pedicellarise with large opening, irregularly limited below and reaching 

 the point; no end-tooth; no limb on the stalk. Small pedicellarise of the same structure as the large 

 ones. Tridentate pedicellariae with delicate, dentate lamellae in the blade. Spicules simple. The spines 

 long, compressed, curved. 



Species: A. curi'atispinis (Bell). 



Distribution: Mauritius. Littoral (?). 

 Stereocidaris Pomel. 



Large globiferous pedicellarise with large opening reaching quite to the point; no end-tooth; 

 no limb on the stalk. Small pedicellarise of the same structure, without end-tooth. Tridentate pedi- 

 cellarise simple. The spicules often larger, fenestrated plates; in some species simple. 



Species: St. japoiiica Doderl., grandis Doderl., sceptrifcroidcs Doderl., indica Doderl., ingolfiana 

 n. sp., nutrix (Wyv. Thorns.), canaliculata (A. Ag.), Mortcnseni (Koehler), (?) incerta (Koehler). 



Distribution: Cosmopolitan. Littoral-archibental forms. 

 Goniocidaris Desor. 



Large globiferous pedicellariee with rather small opening reaching the point; no end-tooth. 

 The valves very short and broad. No limb on the stalk. Small pedicellarise with powerful end-tooth. 

 Tridentate pedicellarise seem not to be found. Spicules of the common form. The spines more or less 

 irregularly widened. The test with deep impressions in the angles between the plates. 



Species: G. tubaria (Lamk.), gcranioidcs (Lamk.), biscrialis Doderl., umbraculiim Hutton. 



Distribution: Australia, Japan. Littoral-sublittoral forms. 



Subgen. Discocidaris Doderl. 



Pedicellarise chiefly as in Goniocidaris. The spines most frequently much widened at the point 

 and with basal widening. 



Species: D. clypeata Doderl., mikado Doderl., (?) scrrata n. sp. 

 Distribution: Japan, the Philippine Islands. Sublittoral forms. 



Petalocidaris n. g. 

 Large globiferous pedicellariae with small terminal opening, the blade somewhat elongated. 



