L.EDA.— Plate VI. 



The oiinate L-Eda. Shell acute, subovate, whitish, 

 concentrically striated ; anterior side ventricose, 

 rayed with a narrow ridge and approximate 

 furrow ; posterior side narrow, acuminated, pro- 

 duced, acutely rostrated, dorsal margin much 

 depressed, arched, area flattened; umboes 

 elevated, acute. 



D'Orbigny. Amer. M<-rid., p. 5it;, pi. 82, f. -t-C. 



Hab. Payta, Peru. 



Species 37. (Mus. Brit.) 



L^DA BicosTATA. Locd. tcstA nrcvatd, semiovatd, com- 

 pressd, epidermide pallidA induid, Kris fere 

 concmlricis, undulatis postice super castas 

 moniliferis sculptd ; latere antico rotunde suh- 

 aeaminato, margine ventrali rotunde convexo ; 

 latere posfico porcis duahus crenulatis arcuatis 

 radiato, margine dorsali depresso, concavo, ad 

 terminum acuta ; umbonibus rotundis, elevatis. 



The two-ribbed IiJE.da. Shell arched, semiovate, com- 

 pressed, covered with a pale epidermis, sculptured 

 with nearly concentric ridges undulated at the 

 back and beaded on the ribs ; anterior side 

 roundly subacuminated with ventral margin 

 roundly convex ; posterior side rayed with two 

 crenulated arched ribs, dorsal margin depressed, 

 concave, acute at the end; umboes rounded, 

 elevated. 



SOWERBY. 



Hab. Panama. 



The arched form .and distinct elevated and curved 

 posterior ribs seem to distinguish this shell from tlie 

 varieties of L(eda Eknensis. 



Species ;>8. (Fig. a. h, Mus. Brit.) 



L^DA E.xcAVATA. Lced. testa pai-vd, brevi, cdtd, ventri- 

 cosd, liris concentricis validis sculptd, pallidissime 

 fulvd ; latere antico brevi, inflata, casteUd prope 

 marginem radiatd ; latere pastico acuminata, costd 

 arcuatd, crenatd, prominenti radiato, ante coslam 

 contracto,areddorsalidepressd, excavatd, late,pland. 



The EXCAVATED L.3EDA. Shell small, short, elevated, 

 ventricose, sculptured with strong concentric 

 ridges, pale fawn ; anterior side short, inflated, 

 rayed with a small rib near the margin ; posterior 

 side acuminated, rayed with an arched crenulated 

 prominent rib, contracted in front of the rib, 

 dorsal area depressed, excavated, wide, flat. 



Hinds. Proc. 2ool. Soc, 1843, p. 100. 



Hah. Panama. 



Species 39. (Fig. a, b, Mus. Brit.) 



L.«;da siicans. Lced. testd acuminatim ovatd, pallide 

 fulvd, suleis tenuibus obliquis postice biradiatim 

 interruptis sculptd ; latere antico langiuscvla ; 

 latere pastico breviusculo, acuminata radiatim, 

 angulato, ai-ed dorsali depressd, angustd. 



The shining L^da. Shell acuminately ovate, pale 

 fulvous, sculptured with fine, oblique sulci inter- 

 rupted posteriorly in two rays; anterior side 

 rather long, posterior side rather short, acumi- 

 nated, radiatcly angulated, dorsal area depressed, 

 narrow. 



A. Ada.ms. Per Ilanley in Thesaurus Conchyliarum. 



Hab. New Zealand. 



