LORIPES. 235 



to have placed them in different genera, one in Lucina 

 as L.lactea, and the other in Amphidesma as A. lucinalis. 



B. Shell marked by flexuous striae ; lateral teeth distinct. 

 2. L. divarica'ttjs *, Linne. 



Tellina divaricate, Linn. Syst. Nat. p. 1120. Lucina divaricate/, F. & H. 

 ii. p. 52, pi. xxxv. f. 3. 



Shell resembling that of L. lacteus in shape, but more 

 tumid and having an oblique outline, thick and opaque, rather 

 glossy : sculpture, numerous imbricated and flexuous striae, 

 which bend from the middle of the shell to each side with a 

 gentle curve, the highest point or centre of the curve being in 

 the direction of the beak ; the striae are irregularly concentric 

 in the umbonal area, and become flexuous in the subsequent 

 stage of growth ; the surface is also marked by minute close- 

 set longitudinal striae or lines as in the last species : colour 

 white with a slight tinge of yellow : epidermis so thin as to 

 be scarcely visible : margins rounded on all sides, except where 

 the beak projects ; the posterior is the highest and forms a 

 kind of shoulder : beaks very prominent, gibbous, close toge- 

 ther, and twisted towards the anterior side : lunide deep, 

 heart-shaped, and defined on each side by a strong ridge : 

 hinge-line curved, occupying not quite one-fourth of the cir- 

 cumference : cartilage light horncolour, narrower than in L. 

 hctev^, but similar in shape and position : hinge-plate rather 

 broad and strong : teeth, in the right valve one strong blunt 

 cardinal, and a long, sharp and raised lateral on each side ; in 

 the left valve two cardinals, one of which is strong and blunt, 

 and the other very much smaller and on a lower level, besides 

 two laminar laterals on each side, receiving between them the 

 single lateral on the corresponding side of the other valve ; 

 the posterior laterals are the longest : inside slightly nacreous 

 but of a dull hue ; margin finely crenulated : scars large and 

 distinct, that left by the anterior adductor muscle being not 

 much longer than the other. L. 0-4. B. 0*4. 



Habitat : South coast of England, but exceedingly 



* Spread out, with reference to the different directions exhibited by 

 the markings on the shell. 



