278 Paleontology op new jersey. 



the New Jersey specimens which I have studied: this is the greater later- 

 ally compressed form of the tube. In this respect they vary greatly, even 

 the ovate specimens, from New Jersey, being much thicker than the west- 

 ern ones; but as far as the ovate and oval form of the section is concerned, 

 the same variations occur among the specimens from both regions, and 

 apparently of about equal numbers, only the New Jersey specimens are 

 never so large as many of the western ones, and are always proportionally 

 thicker, unless accidentally compressed. In the details of the branching 

 of the sutures the western specimens become far more complicated than 

 those on the Atlantic coast, in proportion to the size of the specimens, 

 although the general plan of the divisions, or what might be called the 

 primary divisions of the lobes and sinuses, are very much the same in 

 all the specimens examined. In many of the western ones the secondary 

 . lobes between the large lobes are proportionly longer and have many more 

 serrations on their margins, and in one small individual the ventral sinus, 

 as formed by the two halves combined, has almost exactly the same form 

 and length as those on the sides of the shell. Even on BacuUtes grandis 

 Hall and Meek, the general features of the sutm'es are the same, where, as 

 in one example examined, the width of the specimen is fully 5 inches. 



Considering all these features and close resemblances between the 

 eastern and western specimens I am much inclined to draw the line between 

 the two species, as recognized by Mr. Say and Dr. Morton, considering it 

 as a geographical limit more than as a difference in features, although there 

 is that difference in size and relative thickness of the specimens, and to 

 consider the western forms as properly belonging to B. cotnpressus, and 

 the New Jersey specimens as properly belonging to B. ovatus, irrespective 

 of the form of their section, although it is quite difficult to find one equally 

 rounded on the two margins among those from New Jersey. 



Baculites asper. 

 Plate XL VI, Figs. 10, 11. 

 Baculites asper Morton: Synopsis, p. 43, PL i. Figs. 13, 13, and PL Xlll, Fig. 3. 



This species of Dr. Morton does not appear to have been noticed by 

 wi-iters among the fossils of New Jersey, but it nevertheless seems to have 



