436 



ME. W. P. SLADETf OI^" THE ASTEBOIDEA 



1863. Temnotrema sculpta, A. Agassiz, Proc. Acad. N. S. Philad, 

 p. 358. 



1866. Temnopleurusjaponicus, i?07i Martens, Wiegm. Archiv, Jahrg.32, 

 p. 133. 



1872. Temnopleurus Hardw.ickii, A. Agassiz, Rev. Echini, pp. 166 

 & 460. 



Coll. St. Jolin : lat. 38^ 28' N., long. 141° 25' E., Sendai 

 Bay, 9 fatHoms ; lat. 32° 49' 'N., long. 128° 54' E., Korea 

 (young). 



In this Temnopleurus the sutural pits are wanting altogether on 

 the actinal surface, whilst above the ambitus they are deep and 

 bevelled in the median line of the interambulacral areas, but only 

 small adjoining the poriferous zone ; the sutural pits of the am- 

 bulacral areas are similar to those of the interradia, though 

 smaller ; and these broad, connected, triangular excavations give 

 quite a naked appearance to the median line of the areas. The 

 coronal plates carry only one large primary tubercle, which in 

 the interambulacral areas is placed near the middle of the plate — 

 the series forming two vertical prominent lines, which extend 

 from the apical pole to the actinostome. The spines which are 

 attached to these primaries are conspicuous from all the rest, both 

 by their greater length and by their coloration, which at the base 

 is very dark brown or purple, with the rest of the shaft pink. On 

 either side of the interambulacral primary tubercles there is in 

 general (except towards the apical disk) one large secondary 

 tubercle, the remainder of the plate carrying numerous robust 

 miliaries. In the ambulacral areas the primary tubercle is placed 

 near the outer margin of the plate, and is accompanied by one 

 or, near the ambitus, sometimes two secondaries and several mi- 

 liaries. The anal area is small ; and the genital plates are well 

 tuberculated. The actinostome is also small in comparison with 

 other species. 



The following measurements will show the proportions : — 





A. 



B. 





inillim. 



millim. 





24 



27-25 



Height 



12 



13-5 



Actinostome 



8 



81 



Two young specimens of this species were also obtained, and 

 accord very closely with Mr. A. Agassiz's excellent figures of 

 the growth stages of this Temnopleurus. They were dredged in 



