

RHABDOOERAS, BACTR1TES, ETC. 219 



Genus BACULINA, <FOrb. 



Shell straight, point conical ; sutures of septa a row of rounded 

 lobes, toothed at base. 



Two species. Jurassic. Lower Chalk. Europe. 

 B. ARCUABIA, Quenstedt. PI. 100. fig. 51 7. 



Genus RHABDOCERAS, Hauer. 



Shell straight, orthoceratoid, strongly sculptured ; septa with 

 rounded lobes. 



One species. Alpine Triassic. Germany. 

 K. SUESSII, Hauer. PL 1.00. figs. 513, 514. 



Genus BACTRITES, Sandberger. 



Shell straight ; sutures lobed. 

 Three species. Devonian. Germany. 

 B. GBACILIS. Sandb. PL 100. fig. 515. Nassau. 



Genus TOXOCERAS, d'Orb. 



Shell horn-shaped or curved ; the six lobes and saddles of the 

 sutures simply crenulated ; last chamber large. 



Twenty species. Neocomian, France. 



Connected with Crioceras :md Ancyloceras by numerous in- 

 termediate forms. 



T. BITUBEBCULATUS, d'Orb. PI. 100, fig. 535. 



Genus HAMULINA, .rOrb. 



Differs from Hamites in being only once bent upon itself, not 

 in contact. Perhaps should not be separated from Hamites. 

 Twenty species. Neocomian, France; Gault (?), India. 

 [. TRINODOSA, d'Orb. PL 101, fig. 535. 



Genus HAMITES, Parkinson. 



Shell conical, hook-shaped, bent upon itself more than once. 

 le courses separate. 



Thirty-eight species. Chalk. Europe; S. America. 

 '.. ATTENUATUS, Sowb. PL 101, fig. 533. England. 

 [. CYLINDRACEUS, Defr. PL 101, fig. 534. 



