SW. Ford—New species of Primordial Fossils. 419 
Arr. LIV.—Descriptions of some new species of Primordial 
Fossils ; by S. W. Forp. 
Hyolithes tmpar, n. sp. 
Tux shells of this species are plump, elongate bodies, taper- 
ing to an acute point. The largest specimen obtained would, 
if perfect, be one and three-fourths inches in length. The 
usual length, however, is about one and one-fourth inches. The 
section is generally broadly and regularly oval, but in some 
specimens is rather more flattened on the ventral side than in 
the diagram of the one below given. Some specimens show a 
dag) 8s 
e operculum is of an oval form, irregularly convex exter- 
nally, and for the most part concave within. The nucleus 1s 
Widens in passing from the center out 4 2 
to the edge. With the exception of 
the nucleus, which barely separates G) & 
hese are respectively the dorsal and 
ventral limbs. The ventral limb is a 
by concentric lines. Its convexity 1s 
imb has nearl , Sometimes quite, the 
Same degree of convexity, but may be 
- 1 @, outline of a shell of H. i , Seen m the most flattened or ven- 
be Side ; 1} transverse section. 2 a, side view to show the form of the aperture 
the extension of the lip. 2 , is the interior of an operculum, natural size. 
