CRETACEOUS AMMONITES. " 11 



Ammonites hecticus (Reinecke) Hartmann. 



Nautilus hecticus Reinecke, 1818, Nautili et Argouauloc, p. 70, PI. iv, iigs. 37, 38. 

 Ammonites hecticus Habtjiann, 1830, Versteiueniugeu Wiirteiiibergs, p. 21. 



" " Bronn, 1835-37, Letlifea Gcog., p. 428, PI xxii, fig. 9 a, /y-10 a, h. 



D'Okbigny, 1812, Paleont. Frauv., Terr. Jurass., I, p. 432, PI. clii, figs. 1-5. 

 " " Qdenstedt, 1849, Ceplialopoden, p. 117, PI. viii, figs. 1 a, b. 



" QuENSTEDT, 1858, Der Jura, p. 544, Pi. Ixxi, figs. 21, 22. 



Six specimens. Dimensions of four : — 



1. Diameter, 30 mm. ; width of last whorl, 13 mm. ; thickness of same, 7 mm. 



2. " 27 mm.; "' " " 13 mm.; " " " 7imm. 



3. " 26 mm.; " " " 13 mm.; " " " 7 mm. 



4. " 26 mm.; " " " 12 mm.; " " " 7 mm. 



Examples 1 and 4 agree well with fignre.s of Bronn and Quenstedt, and 

 with fig. 4 of d'Orbigny ; while 2 and 3 seem to represent var. lunula, as 

 figured by Bronn, op. cit., PI. viii, figs. 2 a, b. Coll. Bird. 



Two specimens, smaller than 1-4 and obscurely marked, are probably of 

 this species, of which two varieties are recognized. These were obtained at 

 Mejdel esh Shems, and are from the Merrill collection. 



Ammonites fuscus Quenstedt. 

 Ammonites fuscus Quenstedt, ISaS, Dcr Jura, p. 475, Pi. Ixiv, figs. 1-3. 



Single specimen. Diameter, 26 mm. ; width of last wliorl, 14 mm. ; thick- 

 ness of same, \\\ mm. 



In size, proportions, and markings it agrees perfectly with Quenstedt's 

 figure 1. Umbilicus very small, each successive volution almost wholly 

 covering that which precedes. Coll. Bird. 



CRETACEOUS AMMONITES. 

 Ammonites Syriacus Von Buch. 



Ammonites Syriacus, L. von Buch, 1840, Ueber Ceratiten, p. 20, PI. vi, figs. 1-3. 

 Conrad, 1852, Official Report, p. 221, PI. xiv, fig. 74. 



Three specimens. Dimensions of largest (uncommonly fine, and retain- 

 ing the thin test almost entire): diameter, 52 mm..; thickness, tubercles 

 included, 23 mm. ; width of outer whorl at aperture, 25 mm. 



