548 BRITISH PAL/ZEOZOIC FOSSILS. [GasTERoPopa, 
by the much less proportional width of the body-whorl when compared with the total length), fewer spiral 
whorls, less convexity, and the whorls sloping gradually to the sutures. 
Position and Locality.—Rare in the lower carboniferous limestone of Derbyshire ; rare in the carboniferous 
limestone of Lowick, Northumberland. 
Explanation of Figures.—P1. 3. H. fig.7, small specimen, natural size, front view, from Lowick ; fig. 8, 
larger specimen, from Derbyshire, back view. 
MacrocuHILus CURVILINEUS (Phill.) 
Ref. and Syn. = Buccinum curvilineum Phill. Geol. York. Vol. Il. t. 16. f. 13. 
Desc.—V ery elongate, conic; apical angle about 33°; spire of numerous very gradually increasing whorls, 
(number unknown, the last five commonly preserved,) each moderately convex towards the sutures, rather 
flattened in the middle; sutures deep, simple, distant; diameter of penultimate whorl rather less than the 
height of that and the preceding one together. Surface nearly smooth, marked with fine oblique lines of 
growth. Length of last five whorls one inch seven lines, proportional length of body-whorl =, space between 
last and penultimate sutures ;;,, width of body-whorl =, width of penultimate whorl %. 
Distinguished from the MJ. sigmilineus principally by the greater distance of the sutures apart and the 
flatter whorls. 
Position and Locality—Rare in the carboniferous limestone of Kendal, Westmoreland. 
MACROCHILUS LIMNAIFORMIS (M/’Coy). PI. 3. I. fig. 40. 
Ref —MCoy, Ann. Nat. Hist. 2nd Series, Vol. XII. 
Desc.—Elongate, fusiform, very acutely rhomboidal, greatest width at about the middle of the total length, 
from whence the anterior or basal part is conoidally attenuated or rapidly sloped to the greatly narrowed front of 
columella, and very rapidly sloped to the suture, which is simple and slightly imbricating ; spire very abruptly 
attenuated, long, very slender, sides very concave in the profile, of about six or seven whorls (usually five, 
preserved) ; apical angle 54°. Surface polished, very smooth, with occasionally fine traces of obsolete direct 
lines of growth; mouth narrow, elongate, contracted before and behind; anterior part of columella very 
slightly thickened. Length about one inch seven lines, proportional length of mouth of body-whorl “, width 
of body-whorl ;;, width of penultimate whorl 2, space between last and penultimate sutures §°, width of 
mouth =. 
This beautiful species is so totally distinct in form from any of those described, that it is unnecessary to 
compare them. The very abrupt attenuation of the elongate spire gives so much the outline commonly seen 
in Limnea, as to suggest the specific name; in addition to this remarkable peculiarity, the species differs 
from its congeners in the conoidal attenuation of the produced front, from the line of greatest width of body- 
whorl, which is at about one-third its length below the suture. 
Position and Locality—Not very uncommon in the carboniferous limestone of Lowick, Northumberland. 
Explanation of Figure.—PI|. 3. 1. fig. 40, natural size. 
MACROCHILUS MICHOTIANUS (de Kon.) 
Ref—de Kon. Anim. Foss. Bel. t. 41. f. 14, 
Desc.—Globose ; spire short, pointed, of five or six whorls, slightly convex, and sloping in the lower 
two-thirds, obtusely tabulated and horizontal in the sutural third of each; apical angle 100° or 105°; body- 
whorl very large, tumid; mouth longitudinally ovate, much indented by the body-whorl behind ; rather less 
than the anterior half of the columella, marked, thickened, and slightly arched. Surface with nearly direct, 
obscure lines of growth. Length one inch, proportional length of mouth or body-whorl “, width i» Width 
100 
40 
of mouth =, space between last and penultimate sutures j° 
00* 
The subtabulate flattening near the sutures and great proportional width and gibbosity distinguish this 
species from the MZ. brevispiratus (M°Coy). 
Position and Locality —Rare in the upper black beds of the carboniferous limestone of Derbyshire. 
