56 Leuckart: Bericht üb. d. Leist. in d. Naturgeschichte 



Phyllacanthus fnstigera^ Diadema nudum, Tr i c k o d i a d e, m a (n. 

 gen.) liodgersii, Echinonietra hrtinnea, G lyf loci dar is (n. gen.) cre- 

 nularis, Toxociduris nnda, T. crassispina, T. gtohviosa, T. depressa, 

 Psamrttechinns intermedius^ Ps. •pidch.errimns, Toxopneusfes carnosvs, 

 Microcyphus elegans, Anthec ki nu s (n. gen.) rosens, Te m no tr e m a 

 (n. gen.) sculpta, Laganvm Pntnami, Scapheckinus mirabilis, Lobo- 

 fhora texta, Maretia alta, Lnrenia triangulär is, Echinocardium Stimp- 

 sonii — von denen übrigens mehrere A)ten schon vor Agassiz von 

 B a r n a r d als neu erkannt und charakterisirt sind. Die Diagno- 

 sen der neuen Genera lauten wie folgt: 



Tricho d i a d e m a A. x\g. Ambulacra of a true Diadema ; 

 pores arranged in irregulär vertical arcs of three pairs of pores ; not 

 spreading near the actinal region, Two rows of large tubercles in 

 the ambulacral space. Interambulacral area to the abactinai re- 

 gion ; on each side of these rows tubercles smaller than the am- 

 bulacral, arranged in vertical rows and not in oblique rows, as is 

 usual in the Diademmatidae. Abactinai System almost circular, 

 which distinguishes this genus at once from all other known gener a 

 of this family. Shell thick; tubercles crenulated; spines resembling 

 those of Echinothrix, but stouter and more taperiug. 



G ly p l cid aris A. Ag. Pores arranged, as in Heliocidaris, 

 in narrow irregulär rows; do not spread near actinostome. Tuber- 

 cles crenulated ; spines tapering, long. Two principal rows of in- 

 terambulacral and ambulacral tubercles ; miliaries not numerous. 



An the chinn s k. Ag. Small pentagonal sea-urchins, with 

 prominent abactinai System and openings at angles of plates. The 

 ambulacra convex, projecting beyond the level of interambulacral 

 Space, which is quite depressed. Median ambulacral and interam- 

 bulacral Space free from spines. The bare space follows the line 

 of plates and is not sunken, as in Microcyphus and Temnopleurus , 

 but slopes gradually to the edge of the plate. Tubercles very mi- 

 nute, somewhat larger round the mouth, where they are arranged 

 in diverging rows, extending about half way to the abactinai area, 

 while they are scattered irregularly on the portion of the plates 

 which they cover partially. Pores arranged in single pairs in a 

 vertical row. 



Temnotrema A. Ag. Small sea-urchins, almost globular, 

 with marked grooves at the sutures of the plates, as in Salmacis. 

 Two principal vertical rosvs of tubercles; smaller tubercles crowded 

 irregularly over the rest of the plate, Abactinai system pentago- 

 nal, with prominent angles, the anal system consisting of four pla- 

 tes as in Echinocidaris. Spines like thosc of Salmacis, though finer 



