I 



AND ECHINOIDEA OF THE KOEEAN SEAS. 



439 



Salmacis sulcata, Agassiz. 



1846. Salmacis sulcatus, Agassiz, Cat. Rais., Ann. Sc. Nat. vi, 

 p. 359. 



Salmacis virgulatus, id., ibid. 



1850. Melobosis mirabilis, Girard, Proc. Boston Soc. Nat. Hist. iii. 

 p. 365. 



1866. Salmacis conica, von Martens, Ostasiat. Echin., Wiegm. Archiv, 

 Jahrg. 32, p. 159. 



Diploporus pyramidata, Troschel, Mus. Berolin. (fide v. Martens). 



1866. Salmacis pyramidata^ v. Martens, Wiegm. Archiv, Jg. 32, p. 159 

 (pars). 



1872. Salmacis sulcata, A. Agassiz, Rev. Echin., III. Cat. M. C. Z, 

 Harvard, p. 156. 



Coll. St. John : lat. 34° 8' IS"., long. 126° 24' E., Korean Straits, 

 24 fathoms. 



Test subconoid and somewhat depressed, having small sharp 

 triangular pores in the median areas and at the junction of the 

 interambulacra with the poriferous zones. Ambulacral pores 

 arranged in triple arcs, which have the appearance of forming 

 two vertical rows, two pore-pairs standing on the inner series to 

 one on the outer, in regular alternation — the intermediate space 

 between these single pore-pairs being occupied by a small secon- 

 dary tubercle which isolates them from one another. Coronal 

 plates narrow, the inner third of each being naked. The inter- 

 ambulacral plates at the ambitus bear a horizontal row of three 

 small tubercles, of which the middle one is the largest, and forms 

 a vertical series extending from the apical pole to the actino- 

 stome ; the series adjoining the poriferous zone disminishes very 

 rapidly in size on the abactinal surface, becoming merely miliaries 

 which hadly reach the apex ; whilst the inner series extends only 

 half the distance from the ambitus to the apical disk. Above 

 these tubercles, on the upper margin of each plate, runs a hori- 

 zontal row of well-spaced miliaries. The ambulacral plates carry 

 one large tubercle closely adjoining the poriferous zone ; and this 

 at the ambitus is accompanied by another rather smaller tubercle 

 in horizontal line, but which does not extend in vertical series to 

 within one third of the distance of the apical disk. In addition 

 to these primary tubercles, there are two or three miliaries on the 

 upper margin of the plate, of which the one standing midway over 

 the interspace between the two primaries is almost as large as a 

 secondary tubercle, and extends in series much further towards 

 the apical disk than the small inner primary. 



