ILA.YMOXD: NOTES ON THE ONTOGENY OF PARADOXIDES. 241 



Only a few forms are known from southern Europe (Spain, France, 

 Sardinia). P. asper Borneniann is founded on fragments and its right 

 to be called a Paradoxides is queried by Pompeckj. P. mcdiferraneus 

 Pompeckj is very similar to P. rugulosiis, — was so identified by Ber- 

 geron, — and the cephalon is therefore similar to that of P. haywardi. 

 P. barrandei Barrois has the whole four pairs of glabellar furrows and 

 the glabella touches the marginal rim, but P. prodoanu^ de Verneuil 

 and Barrande, which is very similar, has a narrow furrow between 

 the glabella and rim, but the eyes are very close to the glabella, their 

 anterior ends touch it, and the posterior ends also curve in unusually 

 close to the glabella. 



It appears then that P. haywardi is most closely allied to P. etemini- 

 cus Matthew of the St. John area in New Brunswick, P. Intermedius 

 Cobbold from Comley in Stropshire, England, and P. rugidosus Hawle 

 and Corda, and P. mediterraneus Pompeckj of central and southern 

 Europe. These four species, so far as they are known, all seem to be- 

 long to the P. rugidosus group in which the eye lobes are very long, 

 the glabella is separated from the marginal rim by a furrow (P. ete- 

 minicus has a very narrow furrow) and have a rather long pygidium, 

 the posterior margin of which is straight or concave in outline (the 

 pygidium of P. intermedius is an exception). The eyes of P. haywardi 

 are not of the P. rugulosiis type, nor is the short wide pygidium. It 

 may be noted, however, that the pygidium is not very different from 

 that of P. intermedius Cobbold, to which P. haywardi seems on the 

 whole to be most closely allied. 



