GASTEROPODA. 47 



Shell elongato-fusiform ; turreted, with an obtuse apex ; whorls 7 — 8, convex, 

 striated along the volutions ; outer lip sharp, slightly sinuous ; aperture ovate, ter- 

 minating in an elongated and curved canal. 



Axis, 2-| inches. 



Locality. Cor. Crag, Gedgrave. 

 Red Crag,passiw. 

 Mam. Crag, Bridlington. Recent, British Seas. 



Abundant in the Red Crag ; and I have recently obtained two specimens from 

 the Coralline beds. The latter present a slight difference in sculpture from the 

 recent specimens, having the striae, or ridges, which cover the exterior of the shell, 

 flatter and broader, with narrow sulci between them. In the recent shell the striae 

 are narrow, sharp, and elevated, with broad spaces intervening. Among a large 

 series from the Red Crag these markings may be observed to vary; they are 

 generally flat and broad, but in some they are sharp and narrow. In many speci- 

 mens the shell is left nearly smooth, with a deep depression at the suture, which is 

 the principal difference between the fossil and the recent shell, and is probably pro- 

 duced by alteration or loss of a portion of the shell, as, in some instances, the volu- 

 tions appear nearly separated. The apex is obtuse and smooth, but can scarcely 

 be said to be mammillated, and the canal is generally a good deal twisted. Some 

 specimens are short and tumid, with a diameter three sevenths of the axis, while 

 others are elongated, with a diameter only one third. The same proportionate 

 variations may be observed in the recent shell. 



A specimen, sent from Mr. Bean, with a label " F. Listeri, Crag, Bridlington," 

 appears to me only a variety of this species. 



4. Teophon altum. 8. Wood. Tab. VI, fig. 13, a — b. 

 Fusus altus. & Wood. Catalogue 1842. 

 Murex vullus (?). Woodward, Geol. of Norf. t. 3, fig. 27, 1833. 



Tr. Testa turritd, altd, subulafd, tenui ; anfractibus 7 — 8, converts, longitudinaliter 

 obsolete costatis, et transversim slriatis ; aperturd ovatd, labro tenui, intus Icevigalo ; canafi 

 brevi vix recurvd. 



Shell fusiform and turreted ; very thin, with an obtuse apex ; volutions 7 — 8, 

 convex, with obsolete longitudinal costae, and the remains of transverse stria? ; 

 aperture ovate, terminating in an open and short canal, slightly inflected ; outer lip 

 faintly sinuated. 



Axis, nearly 2 inches. 



Locality. Red Crag, Butley, near Orford. 



About a dozen specimens were found by myself many years since at a localitv 

 where a section of the Crag is not at present visible. The specimens are evident] v 

 in an altered condition, like the attenuated specimens of Buc. undatuw, var. ienerum, 

 many of which were found with them at the same time. The cause which reduced 

 the substance of the one no doubt acted in the same way upon the other. The 

 canal is shorter and more open than in T. yracile, and it is a little imbricated behind 



