186 ('RP:TA(JE0US lamellirranchia. 



The hinge differs from tliat of other species of Ci/clonsmd in that the anterior 

 tooth in tlie left valve is continued foi'wards into a ridge at the inner margrin of 

 the hinge-plate. 



Liicina? fiolidiild, Forbes, appears to be identical with fV??7/.s parva, Sowerby; 

 the type is missing, but other specimens which are in the Museum of tlie Geological 

 Society and were probably identified by Forbes, are undoubtedly examples of 

 V. j)arva. The typo of Lurinn? solidiila, so far as one can judge from the figure, 

 seems to have been rather shorter than most examples of Venus pnrva. 



Venus Orbignyana, Forbes,' from the Crackers of Atherfield, is stated to be 

 allied to T^. jxirra. The type is missing, but a specimen named T'. OrJiir/in/aiui in 

 the Museum of the Geological Society a2:>pears to he a small example of ('i/prina 

 Saussuri (p. 131). 



lismnrks. — Examples of this species vary somewhat in convexity, in relative 

 heiglit and lengtli, in the proniiuence and position of the umbones, and in the 

 projection of tlic hmule at the margin where the valves meet. The tj'pes are 

 internal casts from I'arliain, and they agree, exce])t in being slightly more convex, 

 with casts from Bast Shalford, whei'e specimens with the shell preserved are also 

 found. The latter do not differ from the perfectly preserved specimens found in 

 tlie Crackers of Atherfield. 



'I'l/ji''. — From the Sandgate Reds of I'liilunn Park, in the Rritish Museum. 



Pistrll'ii/idii. — fiower Greensand : /V;y/'^-bed, Crackers, and Red I--") of Ather- 

 field. /'('/'//(^-lii'd of Sandown. Allicrlicld Reds of Reasniarsh and Slialf'oi'd. 

 Sando-ate lieds of I'arliani Pai-k. 



Cvi'K'iMKi;: A (Cvcr.oi.MsiMA) K'oToiMACKNsis {(V Orhiijii ij) , 1S45. IMate XXIX, figs. 4 — 0. 



\8^h. Vknus iMioToMAiii-.Nsis, A. il'<_h-}iiijiiij. Pal. FiiUi<;. Terr. Cn't., vol. iii, p. 



443, ]>1. ccclxxxv, fitjs. 1 — 5. 



ISf)!!. ROTiioMAOKNSis, (VOrhiijinj. Prodr. do Pal., vol. ii, ]). 104. 



l.S(;.''). RoToMAf.KNSis, F. J. Pirlrl ,1)1(1 G. Coiiqjichc. Fo.ss, Ten-. Cn't. 



Ste. Croix (Mater. Pal. Suisse, 

 ser. 4),p. 190. 



1870. - — F. Sf'ilirkza. Palreont. Indica, Cret. Faiiua- S. 



India, vol. iii, p. 161 (? Caryatis). 



RemarJ.-s. — The Knglish examples of this sjiecies are internal casts occasionally 

 with small portions of the shell preserved. l)'()rl)igny's S})ecimens were obtained 



I -Quiirt. Joiiin. (leol. So.'.,' vol. i (1845), p. 240, pi. ii, Al,'. 5; d'Orbigny, 'Prodr. de Pal.,' 

 vol. ii (1850), p. 118; Morris, 'Cat. Brit. Foss.,' ed. 2 (1854), p. 231 ; Piotet aud Campiche, ' Foss. 

 T.'rr. Cn't. Ste. Croix' ('Mater. Pal. Suisse,' ser. 4. 1865) pp. 184, 188; Stoliczka, ' PalKont. Indica, 

 Cr.'l. Fauna S. India,' vol. iii (]«7()), p. ICO. 



