G4 



BULLETIN 3G, UNITED STATES N.ATIONAL MUSEUM. 



really sepaiatc'd lliey liaye yet, a.s Professor Flower lias already said, 

 to be detected. 



Ill T). marginatm, ruclieraii, we have for tbe first time in this gemis 

 iin instance in which both the external and osteological characters are 

 known. We are fortunate enough to have also complete data regard- 

 ing three individuals of a closely allied species, P. iilagiodon., Cope, and 

 are able to point out the distinctions between the two species very 

 satisfactorily (see p. G7). As regards the skull of P. marginatiis, it so 

 very closely resembles that of P. euphrosyne, both in size, proportion.s, 

 and details of structure, that I am unable to find any ground for (he 

 separation of the sj)ecies. Professor Flower and Dr. Fischer both ad- 

 vance the same opinion, though with some hesitation. 



CUjmenc dorides and Clymcnia euphrosynoidcs, Gray. 



The type-skulls of these two species are of the same absolute length 

 and exhibit the closest agreement in the relative proportions of parts. 

 No one who has examined them side by side, can, I think, doubt that 

 they represent the same species. They are smaller than the type of i'. 

 €iq)hrosyne, but agree with that skull in proportions and details of 

 structure. C. euphrosynoidcs was uot described by (iray, and the name 

 lias therefore no validity except for those who hold that reference to a 

 figure answers in the place of a description. 



TaMe of measnrements. 

 PEODELPDINUS EUniKOSYNE, 



