80 ANNAL8 NEW YORK ACADEMY OF SCIENCES 



volution, for the presence of such a tooth appears, in many cases, to be 

 due to a strong spiral on the body volution, which projects into the aper- 

 ture and is accented by the passage of the callus over it. 



M. Cossmann refers this species to Atresius, but in the description of 

 that genus, the l^eak is said to l)e large and bent backward and the spire 

 to be ornamented by nodulose costae, characteristics which do not appear 

 on this species. It seems to bear little resemblance to the type of the 

 genus Atresius. 



Cerithium albense d'Orbigny 



1842-1843. Cerithium albense d'Orbignv, Paleontol. Frangaise, Terrains Cr§- 

 taces, II, Gasteropodes. p. 355. pi. 227, figs. 10-12. 



The original description is as follows: 



Dimensions : Onverture de Tangle spiral, 20° ; longeur totale, 13 millim. ; 

 diametre, 4 milliiu. ; longeur du dernier tonr, par rapport k I'ensemble, 30/100. 



Coquille tres-allongee, acieulee. Spire foriuee d'un angle regulier, compos6e 

 de tours couvexes. separes par des sutures, ernes, en long, de c6tes iu§gales, 

 dont quatre, plus grosses, plus saillantes. tranchantes, vont diminuant de 

 grosseur des superieures aux inferieures. Entre chacune de celles-ci existe 

 une petite cote tres-etroite ; 11 y a encore, en travers, par revolution spirals, 

 de onze ou douze cotes arrondies. droites. sur lesquelles passent les premieres. 



Le dernier tour a de plus une seule cote longitudinale. Bouche ovale, pro- 

 longee en canal, en avant. Labre mince, tranchant. 



Horizon and locality: Neocomian. Marolles (Aube), France. 



Eemarks : The figures of this species show a simple type of shell with 

 rounded volutions, well-developed ribs and three strong spirals on each 

 volution. A finer fourth spiral is also present just below the suture, and 

 the shell is further ornamented by a single intercalated spiral between 

 each pair of the coarser ones. The outer lip has the crenulated margin 

 characteristic of C. cequispirale and later species of Cerithium. 



This shell is simpler than C. cornuelianum in possessing two orders of 

 spirals onl}', and, so far as can be determined without an examination of 

 the shell, it seems to constitute an earlier member of the Cerithium line 

 of evolution. 



G. JURASSIC SPECIES OF CERITHIUM 



Cerithium corallense Biivigiiier 



1843. Fusus covallcnsis Buvignier, Memoire de la Soc. Philomatique de Verdun, 



p. 22, pi. 6, fig. 7. 

 1880. BracJiyfrema coraUemis de Loriol, Abh. Sweiz. Palaont. Gesell., XVI, 65, 



pi. 0. figs. 1, 2. 

 190G. Brachytrema corallensis Cossmann, Essais de Paleoconch. Comp., VII, 



p. 18. 



