L M D A. 



Species 40. (Fig. a, b, Mus. Brit.) 



L.aSDA LUGUBRIS. Lwd. tcstd oblvngo-triijond, ina-rjui- 

 laterali, ventricosd, cnissd, epklermide tenebrosd 

 imliitd, concent rice liratA, liris ciassis remotis ; 

 margine dorsali utrinque declivi, latere postico siib- 

 rostrato, antico rotundo ; areis dorsalibxs Icerilms, 

 latis, dfjinitis. 



The lugubrious L«da. SIicll obloug-trigonal, inequi- 

 lateral, ventricose, tliick, covered with a dark 

 epidermis, conceutrically ridged, ridges tliick, 

 remote ; dorsal margin sloped on both sides ; 

 posterior side subrostrated, anterior side rounded, 

 dorsal areas smooth, broad, defined. 



A. Ad.\ms. Proc. Zool. Soc, 1850. 



Hab. ? 



Species 41. (Mus. Brit.) 



L^DA iNCONSPiccA. Lced. tesid pari-d, jxillide stra- 

 mined, Imvigatd, concentrice tenuiter striald, siib- 

 ovatd; latere postico siibacuminato, angulato, area 

 postangiilari depressd, oblique tntncatd, ad ttTiniman 

 aciiminaid, margine dorsali dcpresso, rectiicsculo ; 

 latere antico subrotundo. 



The iNCoxsriccous L^da. Shell small, pale straw, 

 smooth, concentrically finely striated, subovate ; 

 posterior side subacuminated, angular, postangular 

 area depressed, obliquely truncated, acuminated 

 at the end, dorsal margin depressed, rather 

 straight ; anterior side rounded. 



A. Adams. Proc. Zool. Soc, 1836. 



Hab. Australia. 



A neat little species with an angular posterior ridge. 



leaving a depressed area with a pointed extremity. 



Species 42. (Mus. Brit.) 

 Lj:da commctata. Lnd. testa jiarvd, sidKivatA, pallida ; 

 latere pwstico brein, angusto, rostrato acumiiiato, 

 margine dorsali valde depresso, ared magnd, planu- 

 latd, definitd ; latere antico leviter unicostato ; 

 liris densis, fire concentncis. 



The commuted L.t.da. Sliell small, subovate, pale ; 

 l>osterior side short, narrow, beaked, acuminated, 

 dorsal margin much depressed, area large, flat- 

 tened, defined ; anterior side with a .slight rib ; 

 ridges close, nearly concentric. 



IIanlev. Thes. Conch. Nuculida?, sp. 45. 



Area pella. Brug. 



llab. Mediterranean. 



species ' 



(Fi| 



b, Mus. Brit.) 



L.EDA PELLA. Lced. testd alba, crassd, ventricosd. mib- 

 oratd, tenuiter undulatim et oblique striatd ; latere 

 postico acute angulato, area postangulari in medio 

 vnicostd, margine dorsali rectiusmlo, depresso, costuni 

 crenulatam efformanti,ad teiininiim acuminata ; areis 

 dorsalilius magnis, planulatis, costato-marginalis. 



The JL^cedoxian L.«da. Shell white, thick, ventricose. 

 subovate, finely undidatingly and obhquely 

 striated; posterior side acutely angular, post- 

 angular area with a single rib in the centre, dorsal 

 margin rather straight, depressed, forming a 

 crenulated ridge, acuminated at the end ; dorsal 

 areas large, flattened, rib-margined. 



LiNx^us. Systema Naturse. 



Area interriipia. Polv. 



Xucida fixbula. Sowb. 



Nucula emarginata. Philippi. 



Hab. Mediterranean. 



44. (Fig 



*. Mus. Brit.) 



^pecles 



L^da lata. La-d. testd alba, coniprcssd, late ovatd, 

 acuminatd, tenuiter oblique striatd ; latere postico 

 producto, angusto, acuminata, subrostrato, ared 

 viarginali latd, depressd ; latere antico brevi'usrvlo, 

 superne suhacuminato ; ared latd, margine venlrali 

 sursum acclivi, striis anticis majoribus, j'osticis 

 obsuletis. 



September, 1871. 



