A. Winchell on supposed New Cephalopods. [360] 11 
wholly septate, and about 118 (100) across; dorso-ventral di¬ 
ameter at larger end *41 (34); at smaller end *34 (29); trans¬ 
verse diameter at smaller end *38 (32); interseptal space on the 
dorsum *16 (14); distance of striae *025, giving 4 in one-tenth 
of an inch. 
Locality. Marshall. 
The above species agrees with Hall’s brief description of Gy- 
rocera-s gracile (13th Rep. N.Y. Reg., p. 105), except in the abrupt 
undulation of the septa upon the dorsum. Though the position 
of the siphon is not satisfactorily ascertained, there are some in¬ 
dications that it is excentric though not marginal. The striately 
fluted surface recalls some species of Gyroceras figured by de 
Koninck. 
Nautilus (Trematodiscus) Meekianus, n. sp. 
Shell small, rapidly enlarging, whorls not impressed, flattened 
across the dorsum, and even slightly concave along the periphe¬ 
ral belt; sides obtusely angulated by the flattening of the dor¬ 
sum, the slope from the lateral angle being a regular curve into 
the umbilicus. Transverse section, in consequence of the dorsal 
furrow, somewhat cordate. Surface below the lateral angle, dis¬ 
tinctly striate; above it, very obscurely so. Septa forming a 
very shallow sinus just below the lateral angle, and another, 
considerably deeper, across the dorsum. 
Diameter of whorl (wholly septate) 1*25 (100); dorso-ventral 
diameter *40 (32); transverse diameter *40 (32); interseptal 
space on the dorsum *18 (14); depth of lateral sinus *04 (3); of 
dorsal sinus *07 (6); distance of striae *04, giving two and a half 
in one-tenth of an inch. 
Locality. Marshall. 
The present species is closely related to the foregoing, but 
differs by a more depressed dorsum and coarser striation. 
Nautilus (Trematodiscus) discoidalis, n. sp. 
Shell of moderate size, flattened dorsally and laterally; lateral 
surface but slightly convex, its width nearly equal to the height 
of the shell; umbilical slope regularly curved, making an angle 
of about 120° with the side. Dorsum making a right angle with 
the side, but the character of the peripheral belt has not been 
seen. Cast longitudinally striated or grooved, indistinctly so on 
the sides, while a raised line gives prominence to the dorso-late¬ 
ral angle. Septa forming a broad moderately deep sinus, which 
extends across the entire lateral surface; another one exists upon 
the dorsum. 
A completed volution, wholty septate, measures 1*6 (100); 
dorso-ventral diameter *56 (35); transverse diameter unknown, 
but the umbilical slope on one side is *22 (14); lateral surface 
*88 (24); distance of striae on the umbilical slope *028 (2), 
