28 ECHINOIDEA. I. 



Of the other species referred to Goiiiocidaris^ G. Doderlcini^ according to A gas si z, is most 

 nearly allied to caitaliciilata\ nothing, however, can be said witli certainty, till its pedicellariæ have 

 been examined. 



PhyllacantJms 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 Phyllacanthus as limited here; wliere it 

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



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



Dorocidaris A. Ag. (emend.). 



lyarge globiferous pedicellariæ with well-developed end-tooth; the opening large, rounded or 

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

 tridentate pedicellariæ simple; spicnles simple. 



Species: D. papillata (Leske), Blakci Ag., (?) uiicaus n. sp. 



Distribution: The Northern Atlantic, the ilediterranean. Sublittoral-archibental forms"). 



Tretocidaris n. g. 



Large globiferous pedicellariæ 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 pedicellariæ like the large 

 ones, only with a somewhat larger opening. Tridentate pedicellariæ simple; spicnles simple. 



Species: T. Bartlctti (A. Ag.), ainiulata n. sp., spiiiosa n. sp. 



Distribution: The warm regions of the Atlantic. L,ittoral(?)-sublittoral forms. 



Stephanocidaris A. Ag. (emend.). 



Large globiferous pedicellariæ 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 pedicellariæ of the 

 same structure; tridentate pedicellariæ simple. Spicnles simple. 



Species: .SY. bispinosa (Lamk.), aiimili/cra (Lamk.), hracteata (Ag.). 



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



Schizocidaris n. g. 



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

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

 Tridentate pedicellariæ? Spicnles? 



Species: Scli. assijiiilis n. sp. 



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



Cidaris Klein (emend.). 



Large globiferous pedicellariæ 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 pedicellariæ 



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



Spicnles simple. 



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

 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 ab_vssal. It is impossible to fix the limits between these regions more exactly. 



