PROSOBRANCHIATA. 171 



elevated than the others, except towards the base; where the more prominent lines 

 are placed nearer to each other, and the intermediate ones become very faint or 

 altogether obsolete. — Aperture of an oblong-oval form, rather deeply notched in front ; 

 outer lip simple, sharp-edged and smooth within ; inner lip very narrow, and thin ; 

 columella nearly straight, and furnished with two oblique folds in front, and two or 

 three slender, obscure ones behind. 



Brander's specimen in the British Museum, is unfortunately mislaid, and I have not 

 been able to refer to it; but, judging from the description and figure given in his 

 ' Fossilia Hantoniensia ;'. the present Volute must be the true V. costata of Solander ; for 

 the word inermis, used by that naturalist in his description, cannot be applied to the 

 shells, distinguished by the thick nodiform terminations of their ribs, which have been 

 referred by Mr. Sowerby to that species. 



D'Orbigny (Prod, de Paleont., vol. ii, p. 352, No. 267) has recorded this Volute as 

 identical with the Cochlea mixta of Chemnitz, {V. costaria, Lamk.) ; but in that species 

 the shell is longer and narrower, the surface quite smooth, except at the base ; and the 

 columella curved and furnished with two folds only. The two shells appear to me to 

 be quite distinct from each other. 



The shell from Bracklesham Bay figured in Mr. Dixon's work (t. 5, fig. 24) as 

 V. costata, is a specimen of V. Maga ; and those from Dax and Saubrigues, which 

 Grateloup has considered to be identical with Solander's shell (fig. 45) appear to belong 

 to a different species ; they are represented as sub-turreted, with numerous rounded 

 ribs, and with many folds on the columella, extending nearly to the posterior extremity 

 of the aperture. 



Size. — Axis, 2 inches nearly; diameter, 8-10ths of an inch nearly. 



Locality. — Barton. 



No. 110. Voluta humerosa. F. E. Edwards. Tab. XXII, figs. 6 a, b. 



Voltjta costata. Sow. 1821. Min. Con., vol. iii, p. 163 ; t. 290, figs. 2 and 4 (non fig. 1.) 



Testa ovato-fusiformi, sub-turritd, costata, transversim tenuissime lineatd, ad basin 

 profunde et late emarginatd ; spird productd, apice acuto .■ anfractibus sub-planis ; costis 

 distantibus, crassis, rohmdatis, postice nodigeris ; aperturd ovato-r/tomboidali, postice sub- 

 canaliculatd ; labro incrassato, intus Icevi ; labio angusto, crasso ; columella fiexuosd, bis 

 vel ter plicatd. 



Shell ovately fusiform, sub-turreted, longitudinally ribbed, transversely finely 

 striated ; the base deeply and widely notched, and much bent backwards ; spire ele- 

 vated, but shorter than the last whorl ; apex small, pointed : whorls five or six, exclu- 

 sive of the embryonic whorls, very slightly convex, and flattened at the sides ; ribs 

 distant, broad, obtuse, reaching almost to the base, and at the posterior extremities 



