NATURAL SCIENCES OF PHILADELPHIA. 427 



ptesius, Sandb. (Verstein, Taf. xxii. 6.) = B. striatus, Sow. My specimens 

 have the transverse section and external markings of the latter, but they are 

 less capuliform (See March. Sil. Syst., 604, hi. 12e). 



Bellerophon nautiloides, n. sp. Shell involute, scarcely umbilicate, longi- 

 tudinally striate and deeply notched. Dorsum regularly rounded, sometimes 

 slightly raised along the peripheral band ; sides less convex than the dorsum, 

 bending into a small shallow umbilicus, not disclosing previous whorls. 

 Aperture crescentic, width about equal to its height, strongly auriculate. 

 Not h deep, but obtuse, broad, infundibuliform, with its margins reaching to 

 the tips of the auriculations. Exterior surface longitudinally striate, with 

 fine sharp raised lines marking the sides as well as the dorsum. Cast 

 smooth, perforately umbilicate, exposing two whorls. 



Diameter of large specimen -50 (100) ; height of whorl at aperture -31 (62); 

 depth of impression of inner whorl into outer -09 (18) : height of aperture -22 

 (44) ; width of aperture -27 (54) ; separating distance between tip of auricu- 

 lation and inner whorl -10 (20) ; depth of notch -17 (34). 



Locality. Moscow, Battle Creek, Marshall, and near Grandville, Kent county. 



Bellerophon Michiganensis, n. sp. Shell globose, carinate, involute, 

 scarcely umbilicate, longitudinally and transversely striate. Dorsum obtusely 

 angulated by the peripheral band, which is slightly raised, and more distinctly 

 relieved by a, furrow which runs along each margin. Dorso-lateral surfaces 

 regularly convex, bending (in the cast) abruptly into a small perforate umbil- 

 icus. Aperture suddenly and widely expanded, broadly auriculate, and with 

 a broad, rather shallow notch. Exterior of shell not seen ; casts generally 

 nearly smooth or faintly marked by longitudinal striae, sometimes distinctly 

 marked by two sets of stria?, the longitudinal consisting of 8 to 12 prominent 

 raised lines on each side of the band, with one or two small intervening striae, 

 which gradually attain the size of the larger, these being crossed by finer, 

 less regular transverse stria?, broadly curved anteriorly on the sides and sud- 

 denly bent backwards on the dorsum. 



Diameter of last whorl (of cast) -23 (100) ; height of aperture -14 (61) ; 

 diameter of aperture -35 (152) ; diameter of whorl -08 (35) back from the 

 aperture -25 (109) ; diameter of next inner whorl where it touches the lip "17 

 (74) ; width of band close to aperture -07 (30) ; depth of notch -04 (17). 



Localities. Battle Creek, and the vicinity of Grandville, Kent county. 



The characteristic of this species when compared with B. galericulatus is its 

 great width in relation to its height, its much greater expansion of aperture, 

 and its transverse stria?. The existence of a carina distinguishes it from B. 

 lineolatus, Hall, from Rockford (13th Ann. Rep. Reg., N. Y., 107). 



Bellerophon Barqcensis, n. sp. Shell small, globose, involute, rapidly en- 

 larging, dorsally depressed ; umbilicus small, but deep ; dorsum broadly con- 

 vex, with a distinct raised band ; sides sharply rounded into the umbilicus ; 

 aperture crescentic, expanded, with a deep broad constriction behind it ; notch 

 deep and narrow. Surface marked by fine, regular, longitudinal lines, which 

 cover the band as well as the other parts. 



Diameter -48 (100) ; transverse diameter of aperture *54 (112) ; height of 

 aperture to middle of umbilicus -27 (56). 



Locality. Pt. aux Barques, above the gritstones. 



Most nearly resembles B. Michiganensis, but the apertural construction and 

 single set of striae render it easily distinguishable. 



Bellerophon lineolatus, Hall (13th Rep. N. Y. Reg., p. 107). An imperfect 

 specimen agreeing fully with Hall's description. 



Locality. Holland, Ottawa county. 



Goniatites, de Haan. 

 Gohtatites Romingeri, n. sp. Shell of moderate size, globoid, exumbilicate. 

 1862.] 



