122 MOLLUSCA FBOM THE CRAG. 



1. Lacuna reticulata. S. Wood. Tab. XII, fig. 10. 



Macromphalus reticulatus. S. Wood. Cat. in. An. and Mag. Nat. Hist. 1842, p. 537, pi. 5, fig. 16. 



L. Testa minutd, fusiformi, tenui, fragili ; spird productd ; apice subacuminato ; 

 anfractibus 4 — 5, convexis, longitudinaliter plicatis, plicis confertis,obliquis, et transversim 

 striatis; decussantibus ; aperturd ovatd ; bast sub acuminata ; labro aeuto ; umbilico magno 

 lineari. 



Shell small, fusiform, thin, and fragile, with an elevated spire, and subacuminated 

 apex ; volutions 4 — 5, convex ; suture deep, longitudinally costated or plicated, 

 with numerous oblique imbricated ridges, transversely striated, forming a reticu- 

 lated surface; aperture ovate, lower part rather acuminated; peritreme sharp and 

 continuous ; umbilicus long and narrow. 



Axis, % of an inch. 



Locality. Cor. Crag, Sutton. 



My cabinet contains only a few small specimens of a shell which I had con- 

 sidered in my Catalogue as generally distinct, in consequence of its elevated spire 

 and reticulated surface. It is now restored to Turton's genus, until a greater 

 number of better specimens shall determine its true position. The lines of growth 

 are elevated into small obtuse costuhe. There are about twenty on the body 

 whorl, which are crossed by elevated spiral lines. It much resembles the fusiform 

 species of Cancellarias or Admete, but it has a large and linear umbilicus. 



At Tab. xv, fig. 12, the artist has inadvertently given a second figure of this 

 species. 



Turbo,* Linn. Lam. 1801. 



Gen. Char. Shell turbinated, ovate, or conoidal, generally large, thick, and 

 strong, with a short spire, and few volutions ; aperture oval or subcircular ; peri- 

 treme sharp and continuous, with a testaceous and solid operculum. 



1. Turbo sph^iroidea. S. Wood: Tab. XV, fig. 9. 



Turbo (?) spileroidea. S. Wood. Catal. of Shells from the Crag, in An. and Mag. of Nat. 



Hist. 1842, p. 533, pi. 5, fig. 3. 

 — Morris. Cat. of Brit. Fossils, p. 165. 



T. Testa minutd, splicer oided ; spird depressd ; anfractibus tribus, convexis, rotundatis, 

 striatis; striis 6 — 7, elevatis distantibus ; peritremd acuta ; umbilico magno aperto. 



Shell very small, spheroidal, nacreous, with a slightly elevated spire ; whorls 

 three, convex, and rapidly enlarging ; suture deep, spirally striated ; peritreme 

 sharp j umbilicus open, and surrounded by a prominent ridge. 



Axis, half a line. 



Locality. Cor. Crag, Sutton. 



This pretty little shell is very rare in my cabinet. Its exterior is ornamented 

 with about half a dozen elevated strias, or rather ridges, placed at unequal dis- 



* Etym. Turbo-inis, a top or figure of an inverted cone. 



