44.2 GASTEROPODA OF THE INFERIOR OOLITE. 
throughout, but the radial decussation is so slight that the shell is merely 
subgranulate. 
The sinus-band is below the middle and not conspicuous, owing to the 
resemblance of its spiral lines to the general spiral system ; there is a strong central 
line and a fine one on each side. The body-whorl is bluntly angulated at the 
periphery and carries an obtuse carina with about three subgranulate spirals, 
corresponding to the basal keels in the spire whorls. Base extremely convex, with 
well-marked spirals only faintly decussated by radii; umbilicus small. Aperture 
ovate to subrhomboidal. 
> 
N.B.—The three following “ species” represent the Granulata-group in the 
Parkinsoni-zone, and exhibit a sequence of forms from the flat and dehcately- 
sculptured Pl. Palemon to the turrited and rugose PI. trapeza, the species next 
described occupying the middle position. 
383. PLEUROTOMARIA PLICOPUNCTATA, Deslongchamps, 1848. Pl. XL, figs. 2a, 2b, 2c. 
1848. PLEUROTOMARIA GRANULATA, var. PLIcOpUNCTATA, Deslongchamps. Vol. 
cit., p. 102, pl. xvi, figs. 7a, b. 
Syns. — onnata, Defrance. Dict. Sci. Nat., vol. xli, p. 382, 
pl. lxxxvi, fig. 2. 
_— _— — Deshayes, Coq. caract., p. 179, pl. iv, 
fig. 3. 
-- GRANvLATA, Deslongchamps. D’Orbigny, Terr. Jur., vol. ii, 
p- 466, pl. ceelxxx, figs. 1—6. 
— ornata, Defrance. Morris, Cat., p. 271. 
— Derrancit, Hudleston and Wilson. Cat. Brit. Jur. 
Gast., p. 102. 
Bibliography, §c.—Owing to the original misapprehension of Defrance in 
identifying this member of the Granulata-group with Sowerby’s Trochus ornatus, 
there has been a considerable amount of confusion in the nomenclature. 
Endeavouring to escape from the labyrinth of “granulatas”’ and “ ornatas’’ 
which invested it, Messrs. Hudleston and Wilson proposed the specific name 
* Defrancit.’ This had, however, been already applied by d’Archiac and 
de Verneuil (‘ Trans. Geol. Soc.,’ 2nd series, vol. vi, p. 360) to a paleozoic 
Pleurotomaria. In order to distinguish this species it seems best to fall back on 
Deslongchamps’ varietal name. 
Description : 
Height ; : : ; . 16mm. 
Basal diameter : : ; . 35mm, 
Spiral angle . : : ; . 125°—130°. 
