430 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 40. 



very edge of the nodule. This was at once perceived to be precisely 

 similar to that of the previously studied examples from Yale. The 

 skull structure, the intermediate position of the pineal foramen, 

 the epiotic notch, and the shape of the skull are so exactly similar 

 to those of the Yale specimens that the form is unhesitatingly referred 

 to the same species. 



Most interestingly, too, the present specimen has the alimentary 

 canal almost as prefectly preserved as in the 

 other two specimens, so that the three specimens 

 of this species now known all show the alimentary 

 canals. The present specimen is, however, much 

 more developed than the other two if we may 

 judge from the relative sizes and the proportions 

 of the various parts of the body. There is not 

 the slightest trace of branchiae in any of the 

 specimens. The matrix does not preserve the 

 skeletal elements as well as does the hard rock 

 from Saxony in which Doctor Credner found such 

 excellently preserved branchiae. 



The National Museum specimen is nearly half 

 as long again as the smallest of the Yale speci- 

 mens, and the skull is proportionately longer and 

 wider. There is preserved an impression of the 

 anterior edge of both clavicles as has been 

 described for the Yale specimens. No other por- 

 tion of the pectoral girdle is preserved. The 

 right humerus is imperfectly preserved, as is also 

 the right femur and tibia; other than these the 

 fossil is merely an impression. 



The skull is so nearly like what has been 

 described for the Yale specimens that additional 

 description is unnecessary. 1 The pineal foramen 

 is quite large and lies on a line which cuts the 

 orbits into equal longitudinal parts. The inter- 

 orbital space is about equal to the long diam- 

 eter of the orbit, as in the Yale specimens. 

 Traces of sclerotic plates are observed in the 

 left orbit, but they are quite imperfect. 



The alimentary canal is unlike that described 

 for the Yale 'specimens 2 in that the intestine is longer and much more 

 convoluted. It lies in five longitudinal folds and ends in an enlarged 

 cloaca near which are the impressions of two glands which may be 

 the posterior ends of the oviducts, as has been suggested for the Yale 

 specimens, but it is rather peculiar that all three specimens should 



Fig. 1.— A drawing of 

 the specimen of eumi- 

 crekpeton parvum 

 Moodie (Cat. No. 4400, 

 U.S.N.M.). a = Anus; 

 /=femur; A=humerus; 

 i= interclavicle; in = 

 intestine; m= man- 

 dible; o= orbit; s = 



STOMACH; t= TIBIA AND 

 FIBULA. X2. 



i Kans. Univ. Science Bulletin, vol. 5, 1911. 

 s Amer. Nat., vol. 44, June, 1910, p. 368. 



