JAPANESE ASTEROÏDE A. 411 



coast) ; ved Nordamerikas 0stkyst ned til ca. 38° N. (on the east coast of 

 Noi-th America down to ca. 38° N.)- Nordlige-Stillehav, fra Berings-Hav til 

 det Japanske-Hav, og til Kadiak 0en ved den amerikanske Kyst (north 

 Pacific from Bering Sea to the Japan Sea, and to the Kadiak Isl. on the 

 American coast)." 



This species is not contained in any of the collections on which this 

 monograph is based, but is represented by numerous examples in the Alba- 

 tross collection of 1906. It will be treated of in my report on that collection 

 now in preparation. 



Stellaster eqtiestris (Retzrts). 

 (PL Xin, figs. 213-218 ; PI. XIV, fig. 219-220.) 



The genus Stellaster is due to Gray who gives the following diagnosis 

 [ '40, p. 277] : " Body depressed, covered with large flat regular six-sided 

 plates, margin with two rows of large tesserae ; the lower rows with a series 

 of compressed mobile spines." The single species described was St. cMl~ 

 dreni, a synonym of St. equestris first described by Eetzius imder the name 

 of Asterias equestris [ '20, p. 12]. Gray's description is as folloAvs [ '40, p. 

 278] : 



" 1. Stellaster cMldreni. Back convex, with 1 or 2 blunt tubercles 

 on the angles of the centre, arms tlu-ee quarters the length of the width of 

 the body, narrow, attenuated to a blimt recurved tip. 



" Inhab. Cliina or Japan ? " 



MiJLLER and Troschel give the generic diagnosis as foUows [ 42, j). 

 278]: 



"Körper fast pentagonal, auf beiden Seiten i^latt, mit zwei Reihen 

 gi-osser granulirter Randplatten, welche beide zm* Bildung des hohen Randes 

 l^iti-agen. Jede ventrale Randplatte trägt einen hängenden Stachel. 

 Beide Flächen der Scheibe sind mit gi-anulii-ten Tafehi bedeckt. After 

 sübcenti'al." 



