AITD ECHINOIDEA OP THE KOREAN SEAS. 



435 



upon the plates, but ^yhicll diminish both in size and number on 

 the upper portion of the abactinal surface ; two of the secon- 

 daries are placed on the aboral margin of the plate, and stand 

 above the interspaces between the primary tubercles. There are 

 also two or three small tubercles between the arcs in the poriferous 

 zones, the one which stands under the upper pore of each ambu- 

 lacra! plate {i. e. the second pore of an arc) being nearly as large 

 as a primary tubercle ; and its series forms a prominent vertical 

 row. The genital plates are comparatively small, with the ex- 

 ception of the madreporite, and the oculars large, two of them 

 entering the anal circle ; both the ocular and ovarial orifices are 

 conspicuous. 



The actinostome is small, the indentations well marked but not 

 deep, and the buccal membrane furnished with small elongate cal- 

 careous plates. 



The colour of the test is light purple or greenish, having the 

 interradii frequently of a darker tint ; and that of the spines dark 

 olive tipped with purple. In one small specimen the spines of 

 the ambulacra are greyish white tipped with violet. The speci- 

 mens dredged by Capt. St. John accord closely with the descrip- 

 tion given by Yon Martens of Boletia radiata, which Mr. Alex. 

 Agassiz indicates, from personal knowledge, to be synonymous 

 with Barnes's earlier determination of Psa??2«zecAm2^5 intermedins. 

 Hence the present reference of the Echini under consideration. 



EcHiNOMETEA LUCUNTEE {LesJce), JBlainvilU. 

 Coll. St. John : Hatzura, Japan. 



Only one small premature specimen, which seems to vary 

 from the ordinary Pacific form in its shorter and stouter spines, 

 and prominent and somewhat exposed apical disk. E. lucimter^ 

 however, is such a highly variable form, and the changes which 

 take place during growth are so great in all the members of the 

 genus, that the " suggestions " presented by the example under 

 notice do not appear to warrant any special importance being 

 placed upon them. The colour of the spines is light green shading 

 into light violet, and tipped with grey, and having the milled rim 

 white or grey also. Pores arranged in arcs of four. 



Temnopleueus Haedavickii {Gray), A. Agassiz. 

 1855. Toreumatica Hardwickii^ Gray, Proc. Zool. Soc. p. 39. 

 1863. Microcyphus elegans, A. Agassiz, Proc. Acad. N. S. Philad. 

 p. 357. 



32* 



