so ANNALS NEW YORE 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 A tresius, but in the description of 

 that genus, the beak is said to be large and bent backward and the spire 

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

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

 genx\?> Atresius. 



Cerithium albense d'Orbigny 



1842-1843. Ccrith'uim albense d'Okbigny, Paleontol. Frangaise, Terrains Cre- 

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



The original description is as follows : 



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

 diametre, 4 millim. ; longeur du dernier tour, par rapport & I'ensemble, 30/100. 



Coquille tres-allongee, aciculee. Spire forniee d'un angle regulier, composee 

 de tours convexes, separes par des sutures, ornes, en long, de cotes inegales. 

 dout 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 ; il y a encore, en travers, par revolution spirale, 

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



Le dernier tour a de plus une seule c5te longitudinale. Bouche ovale, pro- 

 long^e en canal, en avant. Labre mince, trancliant. 



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



Remarks : The iigures 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. rrquispirale and later species of GeritMiim. 



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

 spirals only, and, so far as can be determined witliout an examination of 

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

 of evolution. 



Q. JURASSIC SPECIES OF CERITHIUM 



Cerithium corallense Buvignicr 



1843. Fiisus corallensis Buvignier, M§moire de la Soc. Philomatique de Verdun. 



p. 22. pi. G, fig. 7. 

 1889. Brachytreina corallevsis de Loriol. Abh. Sweiz. Palaont. Gesell., XVI, 65. 



pi. 9, figs. 1, 2. 

 1906. Brachytrema corallensis Cossmann, Essais de Paleoconch. Comp., VII, 



p. 18. 



