COfiCHYlAA.—DITHYRA. 36. 153 



Venus testd ovatd, aiiticb rotundatd tutnidd, striis confertis Sarniensis. 



transversis regularibus, areola cordafd. 

 Shell oval, rounded and tumid at the anterior side, with crowded 



transverse regular striae, and the areola heart-shaped. 

 Tab. nost. 10, fig. 6. 

 Tellina lata. Lister, Couch, tab. 385, fig. 232. 



Mus. nost. From Guernsea, 



Shell about two inches long, and rather more in breadth, 

 thick, convex, yellowish-white, mostly marked with numerous 

 red or purplish zigzag lines, which are often disposed in inter- 

 rupted longitudinal rays, rarely of an uniform chocolate or fawn- 

 color; and extremely variable in the disposition of its marks 

 and colors. 



The transverse striae are very numerous and rounded, not 

 becoming broader at the anterior side, and usually interrupted by 

 strong transverse lines of annotination ; the anterior side is very 

 obtuse and swollen : the margin obtuse, and in full grown speci- 

 mens a little flexuous towards the anterior end ; beaks pro- 

 minent, recurved, with a purple heart-shaped areola under 

 them; inside white, purple, or greenish-white: two of the 

 teeth cloven. 



Lister appears to be the only author who has noticed this 

 species. We have before us a fine series, from a quarter of an 

 inch to more than two and a half in length, taken alive out of the 

 sand at low spring tides in Guernsea. It is much longer in 

 proportion to its breadth than Venus virgine^; the striae are 

 much more numerous and compact: and it is easily recognised 

 by the remarkable tumidify of the anterior end. 



X 



