282 GINGLYMACONCHA. NUCULADZ. 
Generum Synopsis. 
Testee elongatze, posticé attenuate. Cardo 
dentibus acutangulis instructus ...... 30. LemMBULUS. 
Testz oblique triangulares, margine infe- 
riore rotundato. Cardo dentibus subtri- 
angulatis obtusiusculis instructus...... 31. Nucuta. 
Genus 30. LEMBULUS. 
Shells elongate, rounded anteriorly, attenuated and beaked 
posteriorly. Hinge obtusely angulated, furnished with many 
teeth before and behind the ligament; the teeth composed of 
acutely angular lamellee. 
LEMBULUS SULCATUS. 
Shells concentrically sulcated ; the grooves numerous ; the 
interstices narrow and rounded ; the dorsal margin behind the 
umbones smooth. Length rather more than three-quarters of 
an inch ; height three-eighths. 
Colour brown or luteous-brown, sometimes tinted with 
greenish. Inside white, with a slight pearly lustre. 
Arca minuta, Mont. Test. Brit. 140; M. & R. Trans. Linn. 
Soc. vil. 92; Dill. Desc. Cat. 245; Turt. Conch. Dict. 11. 
Nucula minuta, Flem. Edinb. Encyel. vii. 97. 
It is occasionally found at Sandwich in Kent ; at Tenby; in 
the Frith of Forth ; in Shetland, and in Bantry Bay, Ireland ; 
but is by no means common. 
Genus 31. Nucuta. 
Nucula, Lamarck. 
Glycymeris, Da Costa. 
Shells rather elongate, obliquely triangular, the under mar- 
ginrounded. Hinge nearly rectangular, with many teeth before 
and behind the ligament ; teeth lamelliform, somewhat trian- 
gular, elongate, with their extremities rather obtuse. 
