in cl. Natuigesch. d. nied. Thiere währ. d. Jahre 187G— 1879. 513 



Murrayi, Genicopatayus (ii. gen. Farn. Spatang.) afßniSy 

 Hemiaster gibhosuSj IL zonatus^ Rhinobrissus hemiasicroides 

 Taliati, Schisaster claiidicans, Seh, japoniciis. 



Zur Charakteristik der neuen Genera entnehmen wir 

 den Beschreibungen des Verf. 's die nachstehenden Angaben: 



Aspidodiadcwa A. Ag. This genus is intermediate between 

 tho Cidaridae proper and the Diadeniatidae. It has, like the latter, 

 a thin test with the spines characteristic of that family. It has, 

 like Centrostephanus, buccal plates. Bat the primary tubercles are 

 few in number, as in the Cidaridae, occupyiug with the scrobicular 

 area and accompanying secondary spines nearly the whole of the 

 interambulacral plate. The most characteristic feature of the genus 

 is the arabulacral System. The plates of a nearly uniform size are 

 small, forming, as in Cidaridae, a narrow ring of ocular and genital 

 plates placed side by side surrounding a large anal System. 



Micropyga A. Ag, Allied to Astropyga; it has, like it, a flat 

 test, short spines, but a more compact abactinal System, a small ac- 

 tinostorae with deep indentations for the passage of the gills, and 

 primary tuberculation exteuding both in ambulacral and interambu- 

 lacral areas to the abactinal System. 



Prion ecJiinus A. Ag. The apical System of this genus is si- 

 milar to that of Salmacidae. Single row of plates of pores on each 

 side of median ambulacral line. Actinal membrane covered by 

 plates. Spines serrated, somewhat flattened, radically different frora 

 those of any other genus of Triplechinidae. 



Cionobrissus A. Ag. This genus is interesting, pointing as 

 it does to the affinity of the Pourtalesiae and Brissina. It resembles 

 Brissopsis somewhat, has like it a peripetalous fasciole and petaloid 

 ambulacra, and also possesses a well-marked subanal fasciole sur- 

 rounding what corresponds to a rudimentary anal snout, somewhat 

 like the beat of Echinocardium. The large tubercles within the 

 peripetalous fasciole recall Macropneustes, and the groove, at the 

 ond of which is placed the actinostome, with the rounded actinal 

 surface with its keeled actinal plastron, remind us somewhat of the 

 Pourtalesiae. The spines of the test are pretty uniform in size, 

 with the exception of the larger ones within the peripetalous fascioles. 



Echinocrepis A. Ag. This genus has, like Pourtalesia, a 

 deeply suuken actinal groove and simple ambulacral pores piercing 

 the test. 



Spatagocystis A. Ag. The present genus has a thin test, an 

 outline from above resembling Holaster, but when seen in profile 

 a well-developed actinal anal snout shows its affinity to the Pourta- 

 lesiae. Seen in profile, the outline is regularly arched until it 

 reaches the posterior extremity, which is pointed, projecting above 



