2 THIRD SUPPLEMENT TO THE CRAG MOLLUSCA. 



therefore, I think, be little doubt but that the shell now figured is like the true lucida, a 

 London Clay species, and has got into the Crag by derivation from that formation ; for 

 the shell figured by Sowerby in Dixon's ' Geology of Sussex,' Tab. V, fig. 21, from the 

 Bracklesham beds as R. lucida, differs from that originally figured by him under this 

 name in ' Min. Con.' (and which was from the London Clay of Highgate), and, in my 

 opinion, is specifically distinct from it, as it possesses more numerous and sharp ribs or 

 costulae, and is more regularly striated in a spiral direction, the striations covering the 

 entire surface. 



TROPHON ANTIQUUS, var. DESPECTUS. 3rd Sup., Tab. I, fig. 9. 



MUREX DESPECTUS, Linn. Syst. Nat., edit, xii, p. 1222, 1766. 



Fusus Lam. An. sans Vert., 2nd ed., torn, ix, p. 448, 1843. 



Fleming. Brit. Anim., p. 349, ISVS. 

 TEITONIUM DESPECTUM var. ANTIQUATA, Middendorf. Maikop., p. 135, 1849. 



Locality. Red Crag, Sutton. 



In the first portion of my work I have given many of the extreme forms of this 

 variable species, but there is no figure representing the front or opening of the present 

 variety ; and as the above name of despectus has been several times given as a distinct 

 species from the Red Crag I have thought it necessary to represent a shell here which 

 resembles the recent form of that name. This was introduced as a distinct Crag species 

 by the late Sir Cbas. Lyell in a list accompanying a paper by him, and published in the 

 ' Mag. Nat. Hist/ in 1839, p. 329; by the late Edward Forbes, also, in his Memoir in 

 the ' Geol. Survey,' 1846, p. 426, and in the list by Professor Prestwich in 'Quart. 

 Journ. Geol. Soc./ vol. xxvii, p. 488. I think it therefore incumbent on me to give the 

 accompanying figure of this variety, for such only do I conceive it to be. I will, there- 

 fore, refer to Plate V of my first volume, and assign the figures therein as the following 

 varieties of this species according to my view, viz. Fusus decemcostatus, Gould, ' Invert. 

 Massach./ is represented in it by fig. 1 a; Fusus carinatus, Lam., by fig. 1 b ; Fusus 

 striatus, Sow., by fig. 1 c; Fusus contrarius, Phil, and Nyst, by figs. 1 d k. 



There are some other varieties, I believe, in the Crag of which I have not been able 

 to obtain specimens for representation. Fusus tornatus, Gould, is, I believe, only a 

 variety of T. antiquus, and the shell figured in the ' Ency. Method.' with wavy ridges, 

 ' pi. 426, fig. 4, is another variety, and this I am told has been found in the Red Crag, 

 but I have not been able to see a specimen or I would have had it figured. Brown, in 

 his ' Illustr. Brit. Conch./ pi. 47, figs. 10 and 13, has figured this shell with wavy 

 ridges, and calls it Fusus subantiquatus, but says, " I have great doubts of this being 



