PROSOBRANCHIATA. 233 
centric lines more numerous; and in some specimens from Cuise-Lamotte, in my 
cabinet, the spire is also much elevated, the shell relatively narrower, and the concen- 
tric lines close-set, slender, and regular. In the English specimens the relative height 
of the spire and the character of the concentric lineation agree with those of the 
specimens from Compiegne; but the shell is wider, and the margins of the whorls 
are not so much depressed. These differences, however, attributable probably to local 
conditions only, do not suggest a doubt of the correctness of the identification. 
Size.—Axis, rather more than 5-6ths of an inch (11 millim.); diameter, 3-12ths of 
an inch (rather more than 6 millim.). 
Localities—Clarendon Hill. French—Compiegne (fide Desh.) ; Cuise-Lamotte, 
Trosly-Breuil (fide Graves) ; Laon (fide J/ellev.) MM. Deshayes and D’Orbigny also 
give Parnes; but M. Graves speaks with doubt of that locality. 
No. 157. PLEUROTOMA TEREBRALIs, Lamarch, var. Tab. XXVIUL, figs. 10 a—z. 
PLEUROTOMA TEREBRALIS, Lamk. 1804. Anm. du Musée, vol iii, p. 266, No. 20. 
— — Ib. 1822. Hist. nat., &c., vol. vii, p. 101, No. 25. 
— a De Blainv. 1826. Dict. des sci. nat., vol. xli, p. 391. 
— — Desh. 1832. Encl. méth. (Vers.), vol. iii, p. 799, No. 21. 
— _— Ib. 1824-1837. Desc. des coq., &c., vol. ii, p. 455, t. 62, 
figs. 14—16. 
Var. \st. piTRopis; fig. 10a. P. testé parvuld, elongatd, fusiformi, angustd, turritd, 
lineis spiralibus eleganiissime granulatis ornatd; spird elevatd, acuminatd ; anfractibus 
bicarinatis ; marginibus posticis depressis, concavis, ad suturam granulatis, ceteris levibus, 
vel tenuissime plicatis; carind posticd acutd, denticulatd ; carind anticd fascioli-formi, 
denticulato-plicata ; liners spiralibus plus minusve distantibus, inequalibus ; ultimo anfractu 
antice valde attenuato in canali longo exeunti; sinu lato, fere semicirculari, in margine 
collocato. 
Var, 2d. CONCINNA; fig. 107, %. Testa parvd, bicarinatd, lineis spiralibus pereque 
granulatis, undique, etiam in marginibus anfractuum, ornatd ; carind anticd granulata ; 
lineis spiralibus numerosis. 
Var. 3d. GYRATA; fig. 100, d. Testdé bicarinatd ; carinis fascioli-formibus, crassis, 
oblique plicato-denticulatis ; lineis spiralibus inequalibus, granulosis. 
Var. 4th. PULCHERRIMA; fig. 10e. Zestd parva, bicarinatd ; carind posticd denti- 
culatd ; carind anticd rotundatd, levi ; lineis spiralibus elevatis, rotundatis, simplicibus vel 
obsolete granulatis, suprd canalem confertis, ceteris distantibus. 
Var. 5th. REvoLuTA; fig. 107. Testa bicarinatd ; marginibus posticis anfractuum 
ad suturam levissime crenulutis ; carind posticd acutd, obsolete plicato-denticulatd, superne 
revolutd ; caring anticd lineisque spiralibus granulatis. 
