JPL.ATE 15. 



Page. 



Fig. 1. Lnoceramus Balciiii 56 



l,o. Aii imperfect cast of left valve (type-specimen). 



1,6. Au outline dorsal view, to show its compressed form. 

 Fi<;. 2. Tkigonarca (Breviarca) exigua y:{ 



2, a. An anterior view of the two valves attached and a little parted, natural size (type-speci- 

 men). 

 '■!, b. A left-side view of same. 



2, c. Au internal cast of a left valve, showing impressions of the hinge-denticles on each side. 

 2,(?.- View of left valve, magnified. 



2,6. Surface-striae more highly magnified. 

 2,/. Hinge-area of same, magnified. 

 Fig. 3. Vulsella Meekii - 72 



3, a. Dorsal view of a specimen, with the beaks a little broken. 

 3, b. Side view of an internal cast. 



3, c. Au internal cast of a young specimen. 



Fig. 4. Nuculana bisulcata 101 



4, a. A right-side view of the type-specimen, magnified to two diameters. 



4, b. A dorsal view of the same. 



FlG. ■". Vol. 1)1 A VENTKICOSA ' 11'-! 



5, a. Eight-side view, natural size, copied from the figure of the type-specimen. 



5, b. Same, magnified. 



Fig. (i. Nemodon sulcatinus 82 



6, a. An internal cast, natural size. 



0, b. Same, magnified. (Mesial sulcus not deep enough.) 

 Fig. 7. Nuculana ? equilatekalls 106 



7, a. Right-side view of the type-specimen, consisting of an internal cast, magnified two diam- 



eters. 

 7,b. Dorsal view of same. 



Fig. 8. Nucula planimarginata I'M 



-.((. A right view of the type specimen, consisting of an imperfect east, retaining a pail of 



the shell. 

 8,6. Dorsal view of same. 



Fig '.'. Nil ri. ana subnasuta 105 



A left-side view, natural size. 



Fig. 10. Nucula obsoletistriata 100 



10, ' . i (ntsidc view of type-specimeu, consisting of an imperfecl left valve. 

 10,J. Inside and hinge view, of same. 



