L ^ D A, 



Species 5. (Fig. a, I, c, Mns. Sowerby. ) 

 L.KPA TERNULA. Lced. tcstd oMongd, rostratd, crassd, 

 iilivaced, striis elevatis concentricis numerom, medio 

 densioi-ibus, antice radiatim mtemiptis sculptd ; 

 latere postico siibarntatim rostrato, nhfmre hicos- 

 tato, ad tcrmimim breriler tnincato, niargine dormli 

 depresso, ared drcuviscriptd ; medio inflate, apice 

 obtuse; latere postico breviitsciilo, obscure univa- 

 diato, mibaciiminatim rntvndato. 



The little perna Ljeva. Shell oblong, rostrate, thick, 

 olivaceous, sculptured with numerous raised con- 

 centric strias, more dense in the middle and 

 slightly interrupted anteriorly; posterior side ros- 

 trated with a slight curve, with two obscure ribs, 

 shortly trimcated at the end, dorsal margin de- 

 pressed, area circumscribed, inflated in the middle, 

 apex obtuse ; posterior side rather short, with an 

 obscure ray, subacuminately rounded. 



MiiLLER (Area). Beschiift. Naturf. Berlin, iv. 5."), o?. 



A rca fluciatilis. Schroeter. 



Area Martini. Chemnitz. 



Nucida elomjata. Dandin. 



Lada macileiita. Steenstrup. 



Ilab. Boreal Seas. 



Th( 



ihorter variety is also generally sn 



Dth. 



Species 0. (Fig. a, b., Mus. Cum. in Brit.) 



L.EI1A c^LATA. Lad. testd ovato-acuminatd, olivaccd, 

 oblique subconcentrice sulcata ; latere postico 

 breviore, rostrato, acuminata, unicostato, ad ter- 

 minum Irevissime trunrato, marrjine dorsali de- 

 presso, decliri, ared planulutd, latd ; latere antico 

 prodncto, ad termimnn rotunda. 



The ENGRAVED L.EDA. Shell ovately acuminated, olive, 

 obliquely subconcentric.illy sulcated ; posterior 

 side shorter, rostrated, acuminated, with a single 

 rib, very shortly truncated at the end, dorsal 

 margin depressed, sloped downwards, area flat- 

 tened, broad ; anterior side produced, rounded at 

 the end. 



Hinds. (Nucula). Proc. Zool. Soc, 184;'!. p. 

 Hab. California. 



The striae are not absolutely concentric, 

 little downwards towards the hinder end. 



Species 7. (Fig. a, b, Mus. Brit.) 



L.4:i)A BUCCATA. Laid, testd crassd, latd, oblongo, sub- 

 arcuato, subconcentricS,sulcatd, inwquilaterali; latere 

 postico subattcnuato, rostrato, obscurissime bicostato, 

 costis IcBvigatis, ad terminum oblique truncato ; latere 

 antico breviilsmlo, itifbito, subrotundo. 



The I!L0WN-()UT L.ei)A. Shell thick, broad, oblong, 

 somewhat arched, nearly concentrically sulcated, 

 inajquilateral ; posterior side rather attenuated, 

 beaked, with two very obscure smooth ribs, 

 obliquely truncated at the end; anterior side 

 rather short, inflated, rather rounded. 



Steenstkup, in MiiUer Fauna Grcenlandica. 



llab. Greenland. 



Strongly resembling Lwdn pet 

 more inflated, and deeper shell. 



da, but a stoutei 



■ipecies 8. (Fig. a, b, Mus. Sowerby.) 



[DATA. lyceda testd subi-hombiuUed, ot 

 flatd, solidd, albd, inaquilaterali, late 



L^DA BICU! 



tonga, 



postico oblongo, subailenuato, angulato, ad an- 

 gulum subexcavato et spinoso, post angvlum ared 

 excavatd, ad terminum emarginatd, supra aream 

 ad marginem dorsalem hicarinato, carinis spinosis ; 

 medio oblique sulcato ; latere postico bicostato, inter 

 costas et ad marginem terminalem excentrice sulcato. 

 The two-pointed Ljeda. Shell subrhomboidal, oblong, 

 inflated, solid, white, inajquilateral, posterior side 

 oblong, a little attenuated, angulated, subexcavated 

 and spinose at the angle, with an excavated area 

 behind the angle, emarginated at the end ; above 

 the area at the dorsal margin two-keeled, keels 

 spinose ; middle obliquely sulcated, ])Osterior side 

 two-ribbed, between the ribs and at the terminal 

 margin excentrically sulcated. 



February, 1871. 



