APPENDIX. 325 
Macrra TRrANGULATA, S. Wood. Tab. XXXI, fig. 21 a—d. 
Spec. Char. Testd parvd, ovato-triangulatd, utroque obtusissime carinatd, crassd, striatd aut 
suleatd ; dentibus lateralibus magnis, perpendicularibus striatis. 
Shell small, ovately and broadly triangular; both sides obtusely keeled, thick, striated, or rather 
sulcated ; lateral teeth large, perpendicularly striated. 
Length, * inch. 
Locality. Cor. Crag, Sutton. 
Small specimens of this species are abundant, but they are always more or less decorticated, and, as the 
principal distinction is in the sculpture, they have until now remained in my cabinet as varieties of M. ovata. 
Two or three individuals have recently been obtained with a sufficiency of the outer surface to show that a 
difference existed between it and the recent shell, MW. ovata (M. elliptica, F. and H.), suchas, I now believe, 
will entitle this to a separate specific position: instead of being covered with numerous, fine, irregular, and 
sometimes inosculating striz, like those upon the recent British shell, our fossil is ornamented with regular 
and distinct ridges, and deep sulci between them, corresponding in that character with Brocchi’s description 
of M. triangula, Renieri, “‘transversim sulcata ;’’ but Messrs. Forbes and Hanley have determined the 
triangula, Phil., (M. lactea, Poli, which I presume to be the same,) to belong to M. subtruncata, Mont. 
With these discrepancies, and not having been able to see the Subapennine fossil, the above name is given 
provisionally until it can be better determined. 
Lurrarta RuGosA, Chemnitz. Tab. XXXI, fig. 26 a, 6. 
Macrra rugosa. Chemn. Conch. Cab., vol. vi, p. 236, t. 24, fig. 236, 1782. 
Lurraria ruGosA. Lamk. Hist. des An. s. Vert., tom. v, p. 469. 
= — Desh. Trait. Elem. Conch., t. 10, fig. 7. 
_— — Sismonda. Syn. Meth. Ped. Foss., p. 23, 1847. 
— — Dizon. Geol. of Sussex, p. 17, 1850. 
Ency. Method., pl. 254, fig. 2 a, 0. 
Spec. Char. ‘‘ Testd ovato-oblongd, longitudinaliter densé striatd, et quasi costatd ; area anticd et 
posticd glabrata, obsoleté transversim striatd ; margine exteriore crenulato; colore extus ex albido flaves- 
cente, intus caleareo.’’—Chemn. 
Shell ovately oblong, striated and costated; anterior and posterior areas generally smooth ; lines of 
growth visible; outer margin crenulated or wavy. 
Diameter, 2 inches. 
Locality. Bracklesham. Recent, Coast of Portugal and Mediterranean. 
This species, as a British fossil, appears to be confined to the above locality, where, I believe, it is not 
very abundant. This, like Peeten polymorphus, is no longer an inhabitant of our own shores. It is said 
to be found fossil at Astigiani. The specimen figured is in the museum in Jermyn Street. 
Iutraria solenoides (oblonga) is enumerated in Mr. Dixon’s ‘List of Upper Tertiary Fossils at 
Bracklesham.’ 
