A. Wincheli on supposed New Cephalopods. [356] 17 
a broad (Nautiloid ?) sinus, convex anteriorly, on the supero¬ 
lateral surface, and another of about the same size on the infero- 
lateral surface. A Goniatitic lobe may connect these two sad¬ 
dles, but it cannot yet be discerned. My specimens are sharply 
striated transversely in the umbilical cavity. In size and pro¬ 
portions they correspond exactly with the New York species, 
which occurs in the Portage Group. 
GonIATITES PYGMA2US, D. Sp. 
Shell very small, globose, closely involute, with a minute, 
perforated umbilicus. Whorls divided into quadrants by aper- 
tural constrictions. Dorsum regularly rounded, sides convex. 
Septa moderately angulated; dorsal lobe relatively broad, ob¬ 
tusely rounded, with indications of a slight indentation at the 
apex; lateral lobe shallow, acute, infundibuliform; dorsal and 
lateral saddles broad, shallow, circularly curved. Surface (of 
cast) perfectly smooth. 
A sole specimen, which seems to embrace a portion of the 
last chamber is -25 in diameter; height of section *13; trans¬ 
verse diameter 13. 
Locality. Supposed to be Battle Creek. 
This interesting little species externally resembles G. planilo- 
bus Sandb. (Verstein., Taf. x, 6, 7), but the septa are more angu¬ 
lated. It differs from G. striolatus Phillips (Geol. Yorks., ii, pi. 
xix, figs. 14-19), by a much smaller umbilicus, larger dorsal 
lobe and saddle, and much smaller inferior lateral lobe, and (in 
the cast) by the absence of striae. 
University of Michigan, Ann Arbor, Jan. 30, 1862. 
