AND ITS RELATIONS TO EECENT COMATUL^. 197 



In this case Pietet has entirely foiled to follow d'Orbigny's mean- 

 ing. The type of his Comatulina is not the S. costatus, Goldf., 

 although figured under that name in the ' Petrefacta Germanise ' ; 

 for it differs from the type in two important points. Further, 

 d'Orbigny expressly named the individual figure (tab. I. fig. 7, c) 

 to which his description referred ; and by this means he naturally 

 might be considered to have guarded himself against misappre- 

 hension. Messrs. Dujardin and Hupe followed Pictet's lead, 

 speaking of him as" reconnaisant que d'Orbigny qui prenait pour 

 type le Sol. costatus, et qui le nommait Comatulina lui donnait une 

 caracteristique inexacte en lui refusant a la fois les pieces brachiales 

 et basalesetenpretendant que les bras s'articulent, sans interme- 

 diaire, a la piece centrale." 



The last error is easily comprehensible, as I have shown above ; 

 while the absence of basals is a fact, though Dujardin and Hupe 

 seem to have recognized no more than Pietet did, that Goldfuss's 

 tab. 1. fig. 1 c differs from the adjacent figures of S. costatus in this 

 essential character. 



There are two specimens in the British Museum which are very 

 like the figure in question, one from Nattheim and the other 

 simply labelled " White Jura, Wurteinburg." The former (PI. IX. 

 fig. 8) is the larger, and has a flatter calyx, i. e. the slope of the 

 articular faces is less steep. The central pit for the elastic liga- 

 ment in the great dorsal fossa is less marked than in the second 

 specimen, which is almost exactly like Groldf uss's figure, except that 

 its centrodorsal is a little lower and less tapering. 1 do not think, 

 however, that either of these can be considered specifically dif- 

 ferent from Goldfuss's specimen. At one angle of the Nattheim 

 specimen there is a slight irregularity of growth (PI. IX. fig. 8 b), 

 for the two contiguous radials show a small amount of outer sur- 

 face which slopes away laterally aud disappears rather sooner on 

 one side than on the other. This is an abnormal condition of 

 some interest, from its relation to d'Orbigny's other type, De- 

 camercs, which will be considered immediately. Pigs. 8 a and 

 8 b show the other characters of this type, for which I propose 

 the name Antedon d'Orbignyi, as d'Orbigny was the first to re- 

 cognise its peculiarities. 



Total height 6-^- millims. ; of radials 3 millims. 



VII. — The Wood wardiau Museum contains a specimen from Nat- 

 theim of the Comatulina type, which differs considerably both from 



* Op. cit. p. 211. 



