2 g ECHINOIDF.A. I. 



Of the other species referred to Goniocidaris, G. Duderleiiii, according to Agassiz, is most 

 nearly allied to canaliculata\ nothing, however, can be said with certainty, till its pedicellarise have 

 been examined. 



Phyllacantkus australis Ramsay is still to be mentioned. As to its place in the system can for 

 the present only be said that it belongs scarcely to the genus Pliyllacaiitlnis as limited here; where it 

 is else to be referred we can only learn when its pedicellarise have been examined. 



According to the researches reported here the system of the Cidarids will look as follows: 



Dorocidaris A. Ag. (emend.). 



Large globiferous pedicellariae with well-developed end-tooth; the opening large, rounded or 

 irregular below, not reaching the point. No limb on the stalk. Small pedicellarise with end-tooth; 

 tridentate pedicellariae simple; spicules simple. 



Species: D. papillata (Leske), Blake i Ag., (?) micans n. sp. 



Distribution: The Northern Atlantic, the Mediterranean. Sublittoral-archibental forms 1 ). 



Tretocidaris n. g. 



Large globiferous pedicellariae with powerful end-tooth; the opening a quite small pore rather 

 far from the point. A limb on the stalk, more or less developed. Small pedicellariae like the large 

 ones, only with a somewhat larger opening. Tridentate pedicellariae simple; spicules simple. 



Species: T. Bartlctti (A. Ag.), an nn data n. sp., spinosa n. sp. 



Distribution: The warm regions of the Atlantic. Littoral(?)-sublittoral forms. 



Stephanocidaris A. Ag. (emend.). 



Large globiferous pedicellarise much lengthened and slender with distinct end-tooth; the open- 

 ing rather small, triangular, a little below the point. No limb on the stalk. Small pedicellarise of the 

 same structure; tridentate pedicellariae simple. Spicules simple. 



Species: St. bispinosa (Lamk), annulifera (Lamk), bracteata (Ag). 



Distribution: The Indian Archipelago, Australia. Littoral-sublittoral forms. 



Schizocidaris n. g. 



Large globiferous pedicellarise with distinct end-tooth; the opening a long, narrow slit. No 

 limb on the stalk. Small pedicellariae like the large ones, only the mouth a little shorter and broader. 

 Tridentate pedicellarise? Spicules? 



Species: Sch. assimilis n. sp. 



Distribution : Near New Guinea (Chall. st. 192). Sublittoral. 



Cidaris Klein (emend.). 



Large globiferous pedicellarise with small terminal opening; the blade somewhat prolonged in 



a snout-shaped way. No end-tooth. A more or less developed limb on the stalk. Small pedicellarise 



with well developed end-tooth and large, not terminal opening. Tridentate pedicellariae simple 



Spicules simple. 



J ) In the present work distinction is made between the littoral belt, the sublittoral, archibental, and abyssal licit. 

 The first is reckoned from o — ca. 50 fathoms, the second from ca. 50— ca. 300 fathoms, the third from ca. 300— ca. 1500 

 fathoms; greater depths are called abyssal. It is impossible to fix the limits between these regions more exactly. 



