122 MOLLUSCA FROM THE CRAG. 



1. LACUNA RETICULATA. S. Wood. Tab. XII, fig. 10. 



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



L. Testa minuta, fusiformi, tenui, fragili ; spim productd ; apice subacuminato ; 



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



striatis; decussantibus ; aperturd ovatd ; basi subacuminatd ; labro acuto ; 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 reticulated 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 considered 

 in my Catalogue as generically 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 costulae. There are about twenty on the body whorl, which are 

 crossed by elevated spiral lines. It much resembles the fusiform species of Cancellariae 

 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 ; peritreme sharp 

 and continuous, with a testaceous and solid operculum. 



1. TURBO SPH^ROIDEA. 8. Wood. Tab. XV, fig. 9. 



TUEBO (?) sPHjEEOLDEA. 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, sphceroided ; spird depressd; anfractibus tribw, convexis, rotundatis, 

 striatis ; striis 6 7, elevatis distantibus ; peritremd acutd ; 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 ; 

 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 striae, or rather ridges, placed at unequal distances upon 



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



