GAsTEROPODA.] UPPER PALAZOZOIC MOLLUSCA. 531 
lines of growth. Average length of rather small elongate specimens one inch, height of last whorl “4, height of 
penultimate whorl 4, diameter at base ;;,. 
I have seen such extreme varieties of this species lately, that I suspect my P. canaliculata will turn out an 
unusually depressed variety, with the peculiarity of a channelled band. The Buccinum parallele (Phill.) may 
probably be considered the extreme of the elongate variety. 
Position and Locality —Not uncommon in the lower carboniferous limestone of Kendal; common in the 
red carboniferous limestone of Closeburn, Dumfriesshire ; rare in the carboniferous limestone of Derbyshire. 
Genus. MURCHISONIA. See p. 292. 
MURCHISONIA ANGULATA (Phill.) 
Ref. and Syn.= Rostellaria angulata Phill. Geol. York. t. 16. f.16.=Murchisonia angulata Phill. Pal. Foss. f. 189. 
Desc.—V ery elongate, conic; apical angle about 32°; spire of numerous gradually increasing whorls, very 
strongly angulated a little below the middle by the convergence at an acute angle of the upper and lower 
surfaces, both of which are strongly concave ; the angulation is surmounted by a strong, prominent, single or 
double keel; another distinct keel, but considerably smaller in size, is on the lower part of each whorl, im- 
mediately above the suture, being most strongly marked on the body-whorl; the upper sutural edges are also 
slightly thickened so as to form occasionally another very much smaller obscure keel. Surface with strong, 
subequal, nearly straight lines of growth, converging backwards to the keel. 
The specimen in the collection is too imperfect to give either the number of whorls or the measurements, 
or to shew whether the species is umbilicate or not; it shews, however, very distinctly the strong characteristic 
of the species, which is the thin distinct keel below or on the aperture side of the band, which distinguishes it 
from the M7. Verneuilana and the forms M. de Koninck has confounded with it. 
Position and Locality—Rare in the black beds over the lower limestone of Derbyshire. 
MURCHISONIA DISPAR (A/°Coy). PI. 3. I. fig. 37. 
Ref—M “Coy, Ann. Nat. Hist. 2nd Series, Vol. XII. 
Desc.—Elongate, very acutely conic; apical angle 30°; spire of about eight very gradually increasing 
tumid whorls, having a very thick, obtuse, prominent band, forming a rounded keel much nearer the lower than 
the upper suture; upper and lower surfaces slightly tumid, convex, the lower portion most steeply sloped; the 
band is either simple or rarely with three spiral striz; two strong spiral lines below the keel, and six slightly 
smaller ones above it on each whorl; base of body-whorl rounded, conyex, with an obtuse angulation at such a 
distance below the keel that it is just concealed by the suture on the spiral whorls; lines of growth fine, 
50 
unequal, obscure, slightly arched, oblique to the band. Length seven lines, proportional width =, height of last 
whorl #4, height of penultimate whorl =. 
This species is easily distinguished from its allies, the JZ. subsudcata and MW. Archiacana de Koninck and 
M. Larcomi M°Coy, by the disparity in width of the parts of the whorls above and below the band, and the 
disparity in number of the keels or spiral strize which ornament those parts. 
Position and Locality—Not very uncommon in the impure carboniferous limestone of Lowick, Northum- 
berland. 
Explanation of Figures—PI. 3. I. fig. 37, natural size ; 37a, portion of do. magnified. 
MURCHISONIA QUADRICARINATA (JZ°Coy). 
Ref —M°Coy, Synop. Carb. Foss. Irel. t. 5. f. 9. 
Desc —Very elongate, conic; apical angle 22°; spire composed of eight or nine very gradually increasing 
whorls, separated by very deep sutures, each very tumid and strongly angulated by a thick sinal keel a little 
below the middle; above the principal keel are two considerably smaller ones, the upper forming the tumid 
