212 



terior is faintly tinted yellow when young, but very richly so when 

 old. It is near A. comtgatum, Sowb. 



Doxax obesus. T. parva, solida, ovato-cuneata, ventricosa, 

 nitida, radiatam leviter striata, coloribua albidis et fulvidis omninb 



vel radiatiui picta et plerumque zonis violaceis ornata ; angulo pos- 

 tero-dorsali rectangulari ; facie posteriori cordiformi, subtriangulari ; 

 latere antico angustato, citd rotundato ; margine ventrali denticulate, 

 postice eoarctato : intus alba, vel flavescens, violaeeo nubeculata, ad 

 marginem dorsaleni fuseata. 



Long. ^ ; alt. fo ; lat. ^ poll. San Diego. Lieut. Green. 



In general appearance, especially as to striation and posterior 

 area, it is much like D. anatinum; but the angle at the apex is more 

 nearly a right angle, the anterior margin is less acutely rounded, the 

 striae are none of them punctate ; some of the small specimens are 

 very tumid. The coloration is quite various. 



Tkllina miniata. T. transversa, ovata, tenuis, compressa, valde 

 hians, concentric^ striata, erubescens ; apicibus ante-medianis ; latere 

 antico semiovaU ; latere postico ovato-triangulari ; margine ventrali 

 sub-pendulo: intus miniata: cardo dentibus duobus divergentibua 

 utraque valvii instructus ; nymphis conspicuis. 



Long. 2 ; lat. f ; alt. 1 \ poll. Inhabits San Juan. Lieut. Green. 



Compared with the analogous West India species, T. rosea, it is 

 longer, more delicate, less convex, more inequilateral, more acumi- 

 nated posteriorly, the ventral and posterior margin less arcuate: 

 color much more roseate externally, and intensely red internally; 

 hinge in that species with but a single tooth and the vestige of one at 

 its side. [It is described as sanguinolaria purpurea, Desh. (1854)]. 



Lucixa [Diplodonta] orbklla. T. parva, subglobosa, tenuicula, 

 albida, concentrice inequalitcr striata; apicibus medianis, hand eini- 

 nentibus, absque lunula antiea; lateribus fere symmetries ; intus 

 alba. Cardo valvar dextrse dentibus duobus quorum antico minore — 

 valva; sinistrae dentibus duobus quorum antico bilido, postico perobli- 

 quo, instructus; dentibus lateralibus nullis; cicatricibus leviter im- 

 pressis. palleali serie punctorum composito. 



Long. ' ; all. | ; lat. \ — f poll. San Diego. Lieut. Green. 



The size and globose form of this shell recalls L. columbella, Lam. 

 (/.. Allans', nii, D'Orb.) ; but the valves are much less solid, the 

 beaks less elevated, and have no area on cither side of them; and the 

 surface is not lamellar. L. ylobularis may be more like it. Some 

 specimens are nearly perfect spheres, and all are very convex lenses. 



Tellena (Strigilla) fucata. '/'. edrnarice simillima, sed rotund- 



ior, striis rarioribus, latioribus et magis angulatis, haud undulatis iu- 

 sculpta ; intus omnino miniata. 



