426 PROCEEDINGS OP THE ACADEMY OP 



umbilical slope. In a specimen which is *6 (100) across the outer whorl, the 

 height of the aperture is '32 (53), its width -38 (63). The number of lon- 

 gitudinal striae in one-tenth of an inch is about 14, and the number of trans- 

 verse striae 18. 



Locality. Moscow, Hillsdale county. 



Bellekophon galericulatus, n. sp. Shell small, globose, involute, ecarinate, 

 exumbilicate, longitudinally striate, and deeply notched. Dorsum broadly 

 and regularly rounded, without any evidences of a band, except in approach- 

 ing the aperture of adult shells, where a rather broad band with ventrally con- 

 cave incremental lines can be faintly traced. Aperture crescentic, not sud- 

 denly expanded, strongly auriculate, with the ears hanging detached from 

 the inner whorl. Notch infundibuliform, deep and broad, obtuse, its sidts 

 reaching to the tips of the auriculations. Umbilicus closed, scarcely indented. 

 Dorsal and dorso-lateral surface marked by about 28 longitudinal, sharply 

 raised stria?, separated by much wider flutings, and not perceptibly modified 

 by the dorsal band until within half a whorl of the aperture of the adult shell, 

 when the two middle stria? become slightly raised and enlarged, and the entire 

 set simultaneously die away. Between these stria? and the umbilical point 

 similar stria? diverge spirally and irregular until intercepted by the former 

 set, or by each other. Cast smooth, perforately umbilicate. 



Average diameter of adult *47 (100) ; height of last whorl at the aperture 

 26 (55) ; height of aperture '18 (38); showing the inner whorl impressed into 

 the outer -08 (17) ; width of aperture -35 (74) ; depth of notch '22 (47) : 

 width of peripheral belt at notch *06 (13) ; separating distance between tip of 

 auriculations and inner whorl '10 (21) ; number of stria? in one-tenth of an 

 inch 10, and this is the same in young and old specimens. Diameter of 

 largest specimen seen -53. 



Localities. Marshall, Battle Creek, and nearly all other Southern outcrops 

 of the Marshall Sandstone. 



This shell bears a close resemblance to B. Urei, of authors, but seems to 

 differ in essential points, as follows: From B. Urii, de Kon. (An. Foss. 356, 

 xxx. 4) in being only half the size, having the dorsal belt elevated instead of 

 compressed, in its very deep notch, less proportional width and distinct auri- 

 culations ; from McCoy's B. Urei (Brit. Pal. Foss., 554) in having the stria? 

 much narrower than the intervening grooves and not at all modified by the 

 dorsal band, and in having the width of the aperture less than the diameter 

 of the shell. Prof. Phillips' figures differ in the absence of auriculations, and 

 in the lateral stria?. To Fleming's original description I have not access. 



Bellerophon cyrtolites, Hall (13th Rep. N. Y. Reg., p. 107). Shell sal- 

 cuneiform, laterally somewhat appressed ; whorls very rapidly enlarging, but 

 slightly embracing ; transverse section subcordate, broadest near the umbili- 

 cus ; dorsum strongly but obtusely carinated ; dorso-lateral slope nearly fiat, 

 sometimes slightly concave near the peripheral belt ; sides regularly rounded, 

 as well as the umbilical slope ; umbilicus moderate, exposing only the last 

 volution ; notch deep, pointed, moderately broad. Entire surface of shell 

 ornamented with fine, sharply raised tranverse stria?, which curve backwards 

 upon the side, and meet upon the dorsum in an angle of about 60. The 

 umbilical region and the sides are equally marked by fine longitudinal stria?, 

 which disappear in the vicinity of the keel. 



The largest specimen seen measures across the outer whorl -41 (100) ; height 

 of aperture "23 (56) ; transverse diameter of aperture *19 (46), with about 

 13 longitudinal and 13 transverse striae in one-tenth of an inch, counted on 

 the dorso-lateral slope near the aperture. Another specimen with shell better 

 preserved has 10 transverse stria? in the same distance. 



Locality. Moscow, Hillsdale county. 



The side view and section of this species are not unlike those of B. coni- 



[Sept. 



