91 



postico perobliquo, instructus ; dentibus lateralibus nulHs ; cica- 

 tricibus leviter impressis, palleali serie punctorum composito. 

 Long. 4 ; alt. f ; lat. ^ — f poll. San Diego, Lieut. Green. 



The size and globose form of this shell recalls L. columlella^ 

 Lam. (L. Adansonii, D'Orb.) ; but the valves are much less 

 solid, the beaks less elevated, and have no area on either side of 

 them ; and the surface is not lamellar. L. glohularis may be 

 more like it. Some specimens are nearly perfect spheres, and 

 all are very convex lenses. 



Tellina (Strigilla) fucata. T. carnaricB simillima, sed ro- 

 tundior, striis rarioribus, latioribus et magis angulatis, baud 

 undulatis insculpta ; intus omnino miniata. 



The species named Tellina carnaria is one of those which 

 have been regarded as occurring in widely separated seas, in 

 some of its varieties. I am inclined to think that upon close 

 examination they may be fairly separated, and I have removed 

 the Pacific shell on account of the marks designated above. 

 The interior is throughout deep carmine, and not roseate pass- 

 ing into white at the margin, as in T. carnaria; the strise are 

 less numerous and deeper cut, and their angle of flexure is more 

 acute, so that on the disk they are more vertical, and become 

 crowded and confused at the margin. 



Arthemis saccata. T. tenuis, albida, ventricosa, rotundato- 

 rhomboidea, margine ventrali dilatato ; apicibus sub-medianis, 

 eminentibus ; lunula cordata, linea impressa finita ; valvis tumi- 

 dis, postice compressis et ad marginem sinuatis : cardo valvse 

 •sinistrse dentibus tribus — valvae dextrae dentibus binis fissis in- 

 structus ; cicatrice siphonali acuto, elongate. Long. If; alt. 

 IJ- ; lat. |- poll. Inhabits Mazatlan 1 Lieut. Green. 



The outline is very much as in Cyth. prostrata, especially its 

 pouched ventral margin, but it is much more ventricose, and 

 perfectly simple in its sculpture. 



Cardium luteolabrxtm. T. magna, ovato-globosa, postice 

 truncata, albida epidermide tenui lutescente induta ; apicibus 

 submedianis, tumidis, contiguis ; valvis radiatim costatis nisi ad 

 marginem dorsalem anticalem ; costis 42 rotundatis, canali pro- 

 fundo sejunctis, et aculeis prostratis (postremis fornicatis,) ad an- 



