CEPHALOPODA OF THE CltETACEOUlS MAKLS. 261 



Genus SCAPHITES Parkinson. 



SCAPHITES NODOSUS. 



Plate XLiv, Figs. 13, 14. 



Scaphites {Ammonites?) nodosus, Owen: Geo\ Surv., Iowa, Wis., and Minn., p. 



580, tab. 8, Fig. 4. 

 Scaphites nodosus (Owen) Gabb: Synopsis, p. 33; Meek & Hayden, Proc. Acad. 



Nat. Sci., Phila., vol. 13, p. 420; Meek, Check List Cret., p. 34; Invert. 



Paleont. U. S. Geol. Surv. Terr., vol. 9, p. 436, and varieties; WMtf., 



Paleont. Black Hills of Dakota, p. 440, PI. xiii. Figs. 1-3. 



A fragment of the outer chamber of a Scaphites, which presents all 

 the features of -S*. nodosus Owen, comes to me among the specimens from the 

 Acad. Nat. Sci., Phila. The specimen is without label of any kind, and is 

 associated in the tray with S. hippocrepis. The fragment bears every lith- 

 ological evidence of being from the green sands of New Jersey, and from 

 the Lower Beds. It is the lower end of the outer chamber from near the 

 last septum; having a little of the imprint of the convolutions of it near the 

 lateral margin, and continues to a little beyond the commencement of the 

 outer geniculation. It has a lateral diameter of If inches and a dorso- 

 ventral diameter of If inches from the back to the line of the horizontal 

 portion of the volution. The side is flattened and the back rounded; the 

 latter part marked by small transverse furrows which arch slightly forward 

 in crossing the shell, and are ai-ranged so as to bring about five ridges with 

 their furrows within the space of half an inch in length on the middle of 

 the back. The side is marked by two lines of nodes, one at the lower 

 angle of the volution, and the other a short distance below the ventral line. 

 The last are inconspicuous, while the former are very strong, from three to 

 four in an inch space, and those on the horizontal portion transverse and 

 much larger; the others gradually growing smaller along the geniculation 

 toward the aperture. The side between the lower line of nodes and the 

 ventral margin is marked by strong transverse ridges, arising one from each 

 of the lower lines of nodes, but in ,?.ome cases two of them unite at the 

 upper node, forming only one from that point to the ventral line;» septa of 

 course unknown from the specimen. 



The fragment gives evidence of having attained a size seldom exceeded 

 by the species at its localities in the Black Hills of Dakota, where it is quite 



