BLOOMER : ON SPECIES OF ENSIS AND SOLEN. \ 9 



this pigment traverses the ventral edge of the raantle-lobes, and a still 

 narrower one passes from the siphon along the greater portion of the 



1 dorsal integument. 



1 The anterior adductor muscle is relatively longer and deeper, but 

 not nearly so broad as in S. vagina, thus making the anterior part of 



j the animal considerably shorter. 



3. SoLEN viRiDis, Say. 



S. viridis also resembles S. vagina^ differing from it in being 



I' comparatively deeper and more attenuated at the posterior end. The 



j pedal aperture has a greater curve and extends a little more posteriorly 



I on the ventral surface. The centre of the posterior part of the 



proximal portion of the siphon curves a little anteriorly, and around 



the posterior edge of it is a narrow brownish-black band. 



