RHAfMHirERAK, BACTUITF.S, KTC. 219 



<;cnus BACULINA. .rorh. 



Slii'll stnii^lit. poinl coiiicMl; siiUiivs of scphi :i row ol" roiiiidcrl 



lolu'S. tootlUMl :lt l.MSC. 



Two s[)('eic's. Jurassic. Lower Chalk. Europe. 

 B. ARCUARiA. Qucnsti'dl. n. 100. tio-. 517. 



(ienus KHABDOCERAS. Ihu.er. 



8lu'll straight, ortlioccratoid. str(jniily sculpt incd ; sc[>ta with 

 rounded lobes. 



One si)ecies. Ali)ine Triassic. Germany. 

 K. SuESSii, Hauer. PL 100, figs. 518, 514. 



Genus BACTRITES, Sandbergcr. 



Shell straight ; sutures loLed. 

 Three species. Devonian. Germany. 

 B. GRACILIS, Sandb. PI. lOO. fig. 515. JVa.^mn. 



Geuus TOXOCEEAS, dOrl.. 



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

 sutures simply crenulated ; last chamber large. 



Twenty species. Xeocomian, France. 



Connected with Grioceras and Ancyloceras by numerous in- 

 termediate forms. 

 T. BITUBERCULATUS, d'Orb. PI. 100, fig. 525. 



Genus HAMULINA, d'Orb. 



Differs from Ham.ites in being only once bent upon itself, not 

 in contact. Perhaps should not be separated from Hamites. 



Twenty species. Neocomian, France; Gault (^t), India. 

 H. TRiNODOSA, d'Orb. PL 101. fig. 535. 



Genus HAMITES, Parkinson. 



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

 the courses separate. 



Thirty-eight species. Chalk. Europe; S. Am,erica. 

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

 H. CYLiNDRACEUS, Defr. PL 101, fig. 534. 



