100 DESCRIPTION OF SHELLS FOUND 



ridges ; surface citron or flesh-coloured, streaked with nearly equi- 

 distant, reddish-brown, irregularly shaped spots ; aperture com- 

 pressed and nacred within. Named in honour of Major Martin, May- 

 ville, Ayrshire, by whom it was discovered. — B. 



It has since been dredged by me in the Kyles of Bute ; Mr Forbes 

 has found it at the Isle of Man, and Mr Alder at Dublin, 



II. NEW SPECIES FOUND IN THE NEWER PLIOCENE 

 DEPOSITS. 



1. buccinum striatum. N. s. — Sowerby. 

 Plate I. Fig. 9- 



Buccinum striatum, Sowerby, Records of Gen. Science, vol. i. p. 134. 



" Volutions longitudinally undulated, and transversely striated, 

 and but slightly convex ; the longitudinal ribs rather straight." 



Distinguished from B. undatum by the following particulars. 



" If the B. undatum be examined with a microscope, it will be 

 found that the transverse ridges are elevated, broad, and distant, and 

 there is between each of these ridges, in the upper whorls, a narrow 

 and less elevated ridge, and in the lower or newer part of the shell 

 generally about three. Now, in Buccinum striatum, the ridges are 

 so flat that the shell may more properly be said to be spirally striated 

 than covered, with transverse ridges. The whorls in the new shell 

 are also much flatter than in B. undatum, and the longitudinal un- 

 dations, which in that shell are considerably concave towards the 

 mouth of the shell, are here almost quite straight." — Sowerby. 



Found at Dalmuir by Thomas Thomson, Esq. ^ 



2. fusus peruvianus. — Lamarck. 

 Plate I. Fig. 5, 6. 



Fusus lamellosus, Sowerby, Rec. Gen. Sci. i. p. 133. 



Shell strong, turreted, with six volutions flattened at top ; spire 

 abruptly tapering to an acute apex ; the whole shell provided with 

 broad, longitudinal, lamellar, unequally long ribs, which are thin, 

 broadest above, and slightly inflected at the edges, terminating at 

 the base of the body in front, and running to the point of the beak 

 behind ; aperture semi-ovate, rounded above and contracted below ; 

 canal of medium length, slightly twisted to the right ; pillar-lip 

 broad, white, and well defined, and replicate at its base ; outer lip 

 thin and slightly reflected ; length an inch, breadth half an inch. 



