SANGUINOLARIA. 



TESTA aequivalvis, inaequilatera, transversa, 

 subelliptica, compressa, tenuis, epidermide 

 nitida induta, lateribus hiantulis, marginibus 

 arcuatis, non parallelis. Dentibus cardinalibus 

 duobus in utraque valva; fulcra prominente. 

 Impressiones muscular es duae, laterales, irregu- 

 lares; impressio pallii adhaerentis museuli, sinu 

 magno. 



The shells included by Lamarck under the generic appella- 

 tion of Smiguinolaria, do not form a natural combination, 

 his S, occidens and rugosa being" almost undistinguishable 

 from several Psaynmohice, and his S, rosea and livida being 

 as nearly related to his Solenes, violaceus et rostratus. Our 

 Sanguinolaria, taking Lamarck's aS*. rosea as the type^ will 

 include his S. livida, (which we suppose to be the Solen 

 biradiatus of some authors^) and the two Solens above- 

 named ; and we shall add his Sanguinolaricey occidens and 

 rugosa, to our Psammobice, 



All the species we include in this Genus are Solenes of 

 Linneans^ nor were they separated from Solen by Bru- 

 guiere^ who has even united Anatina to them. It appears 

 to us to be a genus, connecting the Solenes with the 

 Psammobise et Tellinae, and we think that in a natural 

 arrangement it ought to be brought much nearer to the 

 Solenes than it is in Lamarck's Hist. nat. des anim. sans 

 vert. 



The Sanguinolariae are equivalve, inequilateral, 

 transverse, ovate, or elliptical, sometimes transversely 

 oblong, compressed, generally thin shells, covered for 

 the most part with a shining olivaceous epidermis. The 



