213 



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 passing into white at the margin, as in 

 T. carnaria ; the striae 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 [is Cyclina subquadrata Hanley (1845)]. 



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

 truncata, albida epidermide tenui lutescente induta ; apicibus sub- 

 medianis, tumidis, contiguis ; valvis radiatim costatis nisi ad marginem 

 dorsalem anticalem ; costis 42 rotundatis, canali profundo sejunctis, 

 et aculeis prostratis (postremis fornicatis), ad angulum anticum 

 armatis : intus alba, dentibus marginalibus luteo tinctis. 



Long. 3^ ; alt. 3 ; lat. 2\ poll. Inhabits San Diego. Lieut. Green. 



This resembles C. pseudolima, and has been regarded as such ; but 

 the position of the spines at one angle of the ribs instead of along 

 the middle, and the color of the marginal lip, which in that shell is 

 roseate, may alone distinguish them. It has also a more rounded out- 

 line and more globular form, and the ribs are more numerous ; the 

 grooves between the ribs are deeper. 



Anodon ciconia. T. solidula, transversa, oblongo-ovata, ven- 

 tricosa, epidermide lutescente-cornea induta ; apicibus ad trientem 

 anticum longitudinis positis ; latere antico angusto, rotundato ; latere 

 postico dilatato, ad apicem acuto ; margine dorsali haud angulato ; 

 margine ventrali rectiusculo, antice hiante ; declivitate postico 

 tumido, haud angulato ; margarita ex ochraceo incarnata, demum 

 argentea : cavositas apicalis ampla. 



Long. 4 ; alt. 2| ; lat. \ poll. Mexico ? Lieut. Green, Maj. Rich. 



It resembles A. anserina, from Brazil; it is thicker in substance, 

 more tumid on the posterior half, and the epidermis and nacre are 

 quite differently colored. It is more like A. implicata than any other 

 North American species. [Some have thought it might be A.glauca, 

 Valenc] 



Lithodomus [Lithophagus] falcatus. T. fragilis, sub-cylin- 

 dracea, falcata, postice ad declivitatem umbonalem valde angulata, 

 margaritacea epidermide crassa castanea rugis interdum bifurcatis 

 eorrugata induta, apicibus ad octantem anteriorem positis, valde in- 

 volutis ; latere antico dilatato, subgloboso ; latere postico arcuato, 

 coarctato-acuminato, superne fimbriato. 



