95 
Leiorhykchus sesquiplicatus.— Shell having the form of 
Spirigera concentrica , with a more abrupt sinus and fold 
which, with the faint plications, extend only half way to the 
beak. About four plications on the fold, and as many on each 
«ide. Concentric lines fine and indistinct. Length 8.38 mm. 
*(.33); breadth 9.65 mm. (.38). 
Terebeatula Traversei^sis.— In form resembling T 
IAnklwni Hall, but broader, with more of a false area on ven¬ 
tral valve, and no trace of sinus. Surface, also, sub-lam el- 
losely striate concentrically, and pores larger, more oval and 
more remote—their two diameters and their distances being 
as 4: 7: 6, while in T Linklceni the same dimensions are as 
3: 4: 4. Smaller diameter of pores .0321 mm. (.00126); 
greater .0559 mm. (.00220); the intervening distance from 
end to nearest end of pore .048 mm. (.00189.) In T. Link- 
leeni these dimensions are .0213 mm. (.00084), .0321 mm. 
(.00126) and .0359 mm. (.00141). 
Aviculopecten intercostalis.—N early circular in out¬ 
line, compressed ; anterior ear (of left valve) large, depressed- 
convex, strongly isolated; posterior ear small; surface (of 
cast) with about 36 distinct, rigid, neatly defined ribs alter¬ 
nated with the same number of feebler rays terminating in the 
middle of the shell; posterior ear and slope feebly costate; 
anterior ear strongly so ; whole surface with fine concentric 
stride, stronger on the anterior ear. Length and height 21.6 
mm. (.85). 
Sanguinolites (Grammysia ?) suLCiFER.—Small, gibbous, 
oblong; beak sub-terminal, incurved, overhanging a deep 
lunule ; pallial border straight or broadly sinuate; umbonal 
ridge sub-angulated; surface with 16-20 deep sulci separated 
by thin lamelliform, non-imbricated leaves. Length of medium 
specimen 7.62 mm. (.3) ; height 5.08 mm. (.2) ; thickness of 
both valves 3.56 mm. (.14). 
Lucina? Hamiltonensis.—S hell small, circular, appressed; 
beaks central, small, scarcely exceeding the hinge-line, turned 
forward. Exterior with 8-10 deep, broad concentric furrows 
on the body of the shell, and numerous concentric striae. 
Length 15.24 mm. (.6); height 13.97 mm. (.55). Smaller, less 
gibbous and more deeply and broadly sulcated than Lf pro- 
avia. 
Conocardium Emmetense.— Abruptly truncate anteriorly, 
conical posteriorly, .constricted behind the beaks, gibbous, or¬ 
namented with about a dozen strong ribs, which are cancel¬ 
lated by finer and more numerous concentric striae—the three 
ribs on the angle of the truncation stronger than the others. 
Differs from C. eboraceum Hall in the much greater relative 
relative strength of the ribs. 
Conocardium bifarium.—S mall; body of shell rising into 
a ventricose ridge running nearly at right angles with hinge, 
