September 12, 1902.] 



SCIENCE. 



435 



lating them they were placed in sterile glass 

 chambers having close-fitting covers. In six 

 days the apples showed signs of rotting and 

 in ten days pycnidia had begun to form. On 

 the fourteenth day after inoculation the entire 

 epidermis was blackened and densely dotted 

 with the protruding pycnidia. Here again no 

 difference was observed either in the manner 

 of growth or the decay produced by the two 

 species of Sphwi'opsis. An examination of the 

 inoculated apples showed that they were en- 

 tirely free from other fungi. Apples treated 

 in the same way and put under similar condi- 

 tions but stabbed with a sterile scalpel did not 

 decay. 



Finally, spores obtained from the inoculated 

 apples were used to inoculate healthy branches 

 of both the apple and the sumac. So far no 

 difference can be observed in the growth of 

 Bphmropsis rhoina and Sphceropsis maloruni 

 on the apple tree, but the fact that growth has 

 gone on from the points of inoculation is estab- 

 lished. In the sumac, growth has not been 

 so rapid. 



The facts already established in these ex- 

 periments go to show that Sphceropsis rhoina 

 will cause black-rot in the fruit of the apple 

 and will also produce the typical 'canker' on 

 the branches and limbs just as readily as 

 Sphceropsis malorum. Although the evidence 

 is not yet complete it is probable that the two 

 species are identical. 



P. J. O'Gaea. 



The Unin-ersity of Nebraska, 

 August 27, 1902. 



PALEONTOLOGWAL NOTES. 



THE GENERIC NAME OMOSAURUS. 



The name Omosaurus armatus was applied 

 by Owen in 1874 to a dinosaur from the Kim- 

 meridge Clay described by him in ' A Mono- 

 graph on the Fossil Reptilia of the Mesozoic 

 Formations,' issued by the Paleontographical 

 Society. The name first occurs on page 46 

 of the part printed in 1875. 



The same generic name had, however, been 

 used by Leidy in 1856 for a crocodilian de- 

 scribed by him on page 256 of the Proceeding.^ 

 of the Academy of Natural Sciences, of Phila- 



delphia, for that year, to which he gave the 

 name Omosaurus perplexus. 



Omosaurus Owen is thus preoccupied, and 

 for the genus of Stegosaurs included under 

 that name I propose the name Dacentrurus in 

 allusion to the powerful spines with which the 

 tail was armed. 



A NEW GENERIC NAME FOR STEGOSAURUS MAESHI. 



In Vol. XXIII. of the Proceedings of the 

 U. 8. National Museum, pp. 591, 592, I de- 

 scribed a new dinosaur from South Dakota 

 under the name of Stegosaurus marshi, stating 

 that it probably represented a distinct genus, 

 although owing to lack of material generic 

 characters could not be stated. Curiously 

 enough, failure to give a new generic name 

 has resulted in the creation of a synonym. 

 Better acquaintance with dinosaurs in gen- 

 eral and Stegosaurs in particular has shown 

 that the species is not a Stegosaur, but is 

 nearly related to the English Polacanthus. 

 With the present material it is only possible 

 to say that the main apparent differences 

 between Polacanthus and Stegosaurus marshi 

 are the greater size of the latter and the 

 larger and more varied dermal spines with 

 which it was clad. In the light of my past 

 experience, I shall, however, take the liberty 

 of giving a new generic name to the species, 

 and for that purpose propose Hoplitosaurus in 

 allusion to its heavy armature. 



This genus and the English Polacanthus 

 and Acanthopholis are characterized by the 

 sudden and considerable expansion of the long 

 bones at their articular faces, a feature par- 

 ticularly noticeable in the humerus at its 

 distal, extremity. It may be said that in the 

 Stegosauridse not more than two pairs of 

 spines appear to be present and these are near 

 the end of the tail. The main dermal armor 

 is in the form of very large and thin plates 

 running from the head to near the end of the 

 tail. In the three genera named above, placed 

 by Mr. Lydekker in the Scelidosauridse, the 

 dermal armor consists of numerous flattened 

 scutes and many large variously shaped 

 spines. 



F. A. Lucas. 



