TEIIjElTA (PE:;^ILODIi:Ar) LIl'DSAYI n. sp ', 



Description .- Shell of mecLium size, moderately Inequilateral, 

 moderately inflated; roinded anteriorly; posterior end obliquely sub- 

 truncated above, base frentl;; arcuate; dorsal f.^rc'-ins almost ntrair-ht 

 diverging at an angle of about 140*^, the anterior longer; umbo 

 low, acute, situated before the nedian horizontal; siirfaoe, except 

 near the uixibo, scul^jtui-ed ^;;ith relatively c^riS-oicuous , evenly 

 STaced, ooncen\;ric striae, becomin:- coarser pos~eriorly by the ter- 

 inii.a.tion of sorae of the striae, the remainder becoming more 1am- 

 elloce; left valve with stron? ca-rciinals and obscure laterals; rl-]it 

 laterals strong; pallial sinus obscure. 



I)l".iensions .- I-en th, 18 naa. ; alt., 11 ■m. ; semidiam. , 2.5 mm. 



Remarks .- This species is rer)rese:±ed by a right and left' 

 valve. On the right valve the sculptui'-e becomes more cons ^icuo-.is- 

 ly coarser posteriorly. The sculpture is not typical of the sec- 

 tion sin -re it i s finrr than us 'ml and tae lamellae do not rise 

 above the dorsal m.ar.~in as crests. The ore sent form ;liffers fixjm 

 halistrepta by being more conve:-:, vath finer sculpture. 



Occurrence.- Lovrer ITiocene: 3owrlen beds, Bovrden, Jariiaica. 



