61 



passage from the deep rectangular pits to the bevelled grooves of the ambiilacral 

 and inleramhulacral regions". Il is (|uile (rue that forms intermediate in the struc- 

 ture of the lest between toieumaticiis and Hardwickii may be found (I have seen 

 such forms only among Japanese specimens); however, T. Hardwickii must be main- 

 tained as a distinct species'). An examination of the pedicellariæ shows some addi- 

 tional good specific characters. The globiferous pedicellariæ (PI. VI, Fig. 34, PI. VII, 

 Fig. 21) have no distinct lateral teeth, only a rounded knob on each side below 

 the endtooth. The outer corners of the basal part are very sharp. (The figure 

 of a „prong of open-headed, long-stemmed inleramhulacral pedicellaria" given by 

 Agassiz in „Rev. ofEch." PI. XXV. 2, represents a valve of a globiferous pedicellaria, 

 where the endtooth has been broken off, seen from the outer side). Tridentale 

 pedicellariæ I have not been able to find on any of the specimens examined by me, 

 among which are two large, beautifully preserved specimens from the Berlin-Museum. 

 The ophicephalous pedicellariæ (PI. VI. Fig. 32) are shorter and broader than in 

 loreiimaticiis , and the sinuations of the edge are small and indistinct. The tri- 

 phyllous pedicellariæ are alike in the two species, neither is there any difference 

 as regards the spicules and their occurrence in the tubefeet, buccal membrane and 

 internal organs. 



The characters thus found in the pedicellariæ added to those previously 

 known, viz. the raised apical system, the bevelling of the pits (in larger specimens) 

 and the colour of the spines (dark at the base, not ringed'-')), certainly prove 7". 

 Hardwickii to be a distinct species. — Pomel (Op. cit. p. 87) goes to the opposite 

 extreme of what has been maintained by Ives , holding T. Hardwickii to be a 

 distinct genus, for which the old name Temnotrema Ag. is used. If that were right 

 the older name Toreumatica Gray (under which T. Hardwickii is named as first 

 species) would have to be used. But there is evidently no reason at all for making 

 a separate genus of this species; it is merely a distinct, easily recognizable species 

 of the genus Temnopleurus. 



The (supposed) original specimens of T. Hardwickii (in the British Museum) 

 are two naked tests which are, indeed, more like /ore/i/no/jciis than //a;rfw'ic/ci7 as now 

 understood. The pits are not much bevelled, the apical area not much elevated; 

 the few primary spines remaining are greenish, not dark at the base; they are 

 all broken, so it cannot be seen if they were ringed. It is thus rather doubtful 

 if they are really the species now named Hardwickii, but as they are not suffi- 



') Meissneu (Die von Herrn Marine-Stabsarzt Dr. Sander heimgebractiten Seeigel. Sitz. ber. Ges. 

 Naturf. Fr. Berlin. 1892. p. 183) also maintains T. Hardtvickii as a distinct species against Ives, without 

 giving his reasons for it, however. 



') Temnotrema sculpta A. Ag., which is referred to T. Hardwickii as synonym by Agassiz (Rev. of 

 Ech.) is described as having „spines ringed with white and violet" ; thus It certainly cannot be syno- 

 nymous with that species. It needs a renewed examination. 



