218 BAOULTTES, CYRTOCHILU8. 



Family II. AMMONITID^E. 



The lobes and saddles of Ammonites are figured in pi. 103, 

 figs. 565-567 ; pi. 104. figs. 568-570. 



Genus BACULITES, Lam. 



Shell straight, elongated, conical; suture foliately lobed ; last 

 chamber large; margin of aperture dorsally produced. 



Fourteen species. ( 1 retaceous. Europe; Chili; India; 

 United States. 



The baculite limestone of Xormand}' is so called from the 

 numerous remains of the shells of this animal which it contains, 



B. ANCEPS, Lam. PI. 100, fig. 523. France. 



B. BACULOIDES, d'Orb. PL 100, fig. 524. 



Conrad has given the name Cycloceras to a Baculite figured 

 by him, but without generic characters; afterwards, finding that 

 name preoccupied by McCoy, he changed it to Cyclomera. still 

 giving no diagnosis. 



Meek divides Baculites into two subgenerio forms, which, lie 

 remarks, are possibly distinct genera. 



1. Baculites, Lain, (typical). 



a. Shell straight throughout ; aperture directed forward ; lip 

 with lateral sinuses directed backward; the projection of its 

 si phonal margin, straight, and its antisiphonal margin convex in 

 outline; interior without regularly disposed ridges. Type, B. 



\ KRTEBRALIS, Lain. 



(?) 6. Shell straight posteriorly, but with the non-septate part 

 gently arcuate; aperture a little oblique ; appendage of siphonal 

 side of lip arching slightly with the general curvature of the 

 non-septate part, but not curving over the aperture. B. INCUR- 



VATUS. Dujardin. 



2. Cyrtochilus, Meek. 



Shell straight ; aperture opening towards the antisiphonal side, 

 and the lateral sinuses of the lip excavated in the opposite direc- 

 tion; projection of siphonal margin of lip abruptly arching over 

 the aperture, and the antisiphonal margin of same deeply sinuous 

 instead of convex in outline; interior with regularly disposed 

 ridges, leaving oblique constrictions on internal casts. HAMITES 



BACULOIDKS. Mailtell = B. OBLIQUATl'S, Sowb. 



