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The coarse and somewhat prominent ribs render this shell easily 
distinguishable from the rest of the Psammobie. 
Genus CyYTHEREA. 
Cyrnerrea Eerrossa. Cyth. testa ovali-subcordiformi, subequilaterali, 
crassa, nitidd, convexd, transversim profunde sulcatd ; sulcis sub- 
remotis, interstitiis planulatis ; albido-lividd, lineis angularibus, 
saturatioribus, venulatad ; ano impresso, lanceolato ; vulva effossd 
lateribus candidis, fasciis spadiceis undulatis, transversim pictd ; 
disco interno purpureo, marginibus crenatis. 
Long. #; lat. 14 poll. Mus. Stainforth. 
Hab. ? 
The very singular manner in which this and the following species 
are excavated on the anterior side forms their prominent and distin- 
guishing characteristic. 
CyTuerea Excavata. Cyth. testd rotundato-ovatd, subequilaterali, 
postice expansd, antice propter marginis ventralis obliquam curva- 
tionem angustata ; crassd, levi, nitidd, depresso-convexd, pallideé 
Sulvi, venis lividis angularibus, plus minusve distinctis, marmoratd ; 
ano lanceolato ; vulva valde excavatd, lateribus planulatis, candidis, 
spadiceo leviter venulatis ; disco interno roseo ; marginibus tenuiter 
crenulatis. 
Long. 1; pi 14 poll. Mus. Stainforth. 
Hab. 
This shell es the preceding by its anterior excavation, but 
differs both in shape and in the absence of the transverse grooves. 
