L/EDA.— Plate IV. 



Species 21. (Fig. a, h, Mus. Cuming in Brit.) 



L.EDA CUENIFEE.\. Lced. tcstd solidd, albidd, cwiipressd, 

 lanc.eolato-elongatd, antice posticeque tenuiter iiratd. 

 medio Imvigatd, marginibus dorsalihus costatis, 

 crenulatis ; latere antico brevitisculo, area marginali 

 latiusculd, excavatd, costd marginali elevatd ; latere 

 postico longiusculo, margine ventrali medio rectiiis- 

 culo, vtrinque valde sursum acclivi. 



TiiK cnENiFEROus LyEDA. Shell solid, whitish, com- 

 pressed, lanceolately-elongated, anteriorly and 

 posteriorly finely wrinkled, smooth in the middle, 

 dorsal margins ribbed, crenulated; anterior side 

 rather sliorter, with marginal area rather broader, 

 excavated ; marginal rib raised ; posterior side 

 rather longer, ventral margin rather straight in 

 the middle, much sloped upwards at both ends. 



SowERBV {Nucula). Proc. Zool. Soc, 1832, p. 197. 



Ihih. Xipixapi. 



■Species 22. (Fig. a, b, Mus. Cuming in Brit.) 

 L.EDA I'LANULATA. Lwd. tt'std late lanceolatd, sub- 

 aurantid, Icedgatd, comjvessd, planulatd, subceqiii- 

 lateraii ; latere antico suhacuminatim rotunda ; 

 tnargine ventrali post terminum subexcavato, medio 

 convexo, versus terminum posticum gradatim 

 sursum acclivi ; latere postico angustiusculo, acumi- 

 nato. 

 The tlanulate L^da. Shell broadly lanceolate, 

 rather orange, smooth, compressed, flattened, sub- 

 equilateral ; anterior side rather aouminately 

 rounded ; ventral margin behind the end a little 

 e.xcavated, conve.x in the middle and gradually 

 sloped upwards in reaching the posterior end ; 

 posterior side rather narrow, acuminated. 



SOWERBV. 



Hab. Patagonia. 



I find it impossible to assimilate this differently 

 coloured and differently shaped shell to the elegant 

 form of Lada Patagonici. 



Species 23. (Mus. Metcalfe.) 



L-UDA Belcheri. Lmd. testa ohlongd, pallide fulvd, 

 suhconcentrice striaid, compressd, laid; latere 

 antico bi-eviusculo, mai-gine dorsali declivi ; latere 

 antico oblique quadrangulato, ad terminum emar- 

 ginato, adangulos heviter crenvlatim. costato ; area 

 dorsali depressd, complanatd. 



Belcher's 'Lxda.. Shell oblong, pale fawn, nearly 

 concentrically striated, compressed, broad ; 

 anterior side rather short, dorsal margin sloped ; 

 anterior side obliquely quadrangular, emarginated 

 at the end, slightly crenulately ribbed at the 

 angles ; dorsal area depressed, flattened. 



Hinds. Proc. Zool. Soc, 1843, p. 98. 



Hab. Argulhas Bank, Cape of Good Hope. In deep 

 water. 



Species 24. (Mus. Ci 



5rit.) 



Lj:da costellata. Lced. testd elongato-lanceolatd, sub- 

 cuneiformi, distanter concentrice Iiratd, epidemiide 

 pallida corneo indutd ; latere antico breviusculo, 

 suhacuminatim rotundato ; latere 2>ostico conspicue 

 rostrato, biangulato, ad terminum truncato, angulis 

 crenulatis. 



The costellated L.eda. Shell elongately-lanceolate, 

 somewhat cuneiform, distantly concenti-ically 

 ridged, covered with a pale horny epidermis; 

 anterior side narrow, rather short, subacuminately 

 rounded, posterior side conspicuously rostrated, 

 biangular, truncated at the end, with the angles 

 crenulated. 



SowERiiY (Nucula). Proc. Zool. Soc, 1832. 



Hab. Panama. 



Very distinct from Lirda ptrnula by reason of the 

 distant concentric ridges and distinctly rib-margined 

 beak. 



