PALEONTOLOGY. 

 PLATE XI. 



Pago. I 



VouMA KVANSi M. A. H 40D 



Fui. 1. Kiilar;-!*! vii-w of a tuHt of ;i left valvo, sLowing the teeth, muscalar impriuts, and j 



pallial line. f 



Klii. ','. KiilaipMl outline <aiiliiiiil view of a Hpeciuieu retaining the tiliell, showing the : 

 groovr extending along the hinge. 



Ni'ii'i.AN A M iti.giii.ATi;iiA Wliitf 40y , 



Kh;. :t. Knlurged view of the h-ft side of an internal cast, showing tin- form and nin.scnlar 



ini|irintK. 

 I'm. I. Kniarged cardinal view of the Hanie, showing the iuipreHsion of the teeth. 



Nl'CULA l'I.AM.MAI«iINATA .M. iV H 406 



Fiu. T). View of the left hide of a partially exfoliated speeinien, showing the general form. 

 l-'ia. t>. Knlarged cardinal vi«!W of the same, showing the inii)ression of the hinge, along 

 which the shell is nn)re completely removed. 



NUCfL.VNA msi,i.CATA M. &. II 407 



l-'Ki. 7. ICnlargeil vi<'w of a specimen, showing the form and surface markings. 



1i>(»m:aicla sill m audi M. & H 405 



I'iG. H. View of the right side of a specimen of medium size, showingthe form and general 



(•haracter. 

 I'ni. 11. Cardinal view of the same, showing the cartilage area. 

 Fiii. 1(1. I'osterior view of an internal cast, showing the impressions of the ridges bordering 



the muscular imprints. 

 I'Ki. 11. View of a large individual having the valves a little displaced and showing the 



jiosterior hinge-teeth. 



CKAS8.\TKLLA srU»iL'AI>I!ATA Wliitf 412 



Fiu. \i. \"u\v of the right side of the cast, natural size. 



ASTARTK KVANiSl H. it M 413 



riii. i:!. Viiw of the right side of an internal cast, showing muscular scars, pallial line, and 

 creinilated margin. 



Llcixa vextkicosa II. & M 410 



l-"i(i. II. ^■iew of the right siile of a well-formed specimen of medium size, showing the 



general character of the species. 

 Fui. l.">. t'anlinal view of the same, showing the cardinal depressions and ligament. 

 Fiii. Hi. View of an internal cast of a large individual. 



LlCIXA (Uin.()DO.MA ?) SUBUNU.VTA II. & M 411 



Fi(i. 17. View of the right side of one of the larger individuals, showing the narrow, curved 



posterior slojie and a'nte-rior farrow. 

 Fig. If'. Cardinal view of the same, showing the ligament and depressions. 



Ll'ClNA OCCIDKSTAUS Mort 409 



Fi<f. IK. View of a well-formed specbnen of typical form. 



Fi«i. '20. Cardinal view of the same, showing the almost obsolete lunule. 



Flo. 21. Internal cast of a small individual. 



TiiKTis cimii.Aiiis M. & H 417 



Flit. W*2. View of the right side of a specimen of ordinary form. 



FiG. 2;}. Ciirdinal vinw of a .similar specimen, showing the incurved beaks and the convexity 



of the valves. 

 Fio. 24. View of a partial ca.st, showing the character of the pallial line and sinns. 



D0.SINIA Mis.sin'RiAXA Mort. ? 416 



Fio. 2."i. View of the left side of a si>ecimen referred to this species. 

 Flii. 2(5. View of the opjiosite side .showing the pallial sinus. 



Lkioi>isiiia (Cvmklla) Mi:i:ki Wliitf 418 



Fig. 27. View of a right valve of the sjiecies, natural size. 



Fio. •■ir<. Cardinal view in outline, showing the areas bordering the hinge, over which the 

 rnys and loneentric folds do not extend. 



TiiHAfiA Nnuju.VLii.is Whitf 419 



Fir.. 21». View ;if the right side of the specimen, showing the form, and the slit in the beak. 

 Fig. 30. Canlinal view of the sjiine, showing a slight twisting of the valves in the crooked 



hinge line. " 



Nk.vka MciitiiAiKNsis ? M. iV II 420 



Fig. III. Enlarged view of a left valve, showing the features as described. 



