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Fig. 1. C.u.lista (Dosiniopsis) Owenana 183 



Cast ill" the interior of the left valve, showing the posterior muscular impression and pal- 

 lia! sinus (type-specimen). 

 Fig. 2. Mactra (Cymbophora) alta 210 



2, a. Hinge of right valve, showing the peculiar, large, spoon shaped cartilage-cavity, with ele- ■ 



vated margins, and the strong lateral teeth. [The small cardinal tooth connected 

 with the cardinal margin just in front of the cartilage-pit is not well shown.] 



'2, h. An outside view of right valve of the type-specimen. 

 Fig. 3. Inoceramch pertenuis 



!!, (i. An imperfect east of a left valve, retaining some of the inner layer of the shell ou the 

 constricted umbo. 



3, b. Another specimen, of same valve. 



Fig. 4. Cardiom (Criocardium) speciosum 1G9 



4, a. Left valve, being mainly an internal cast. 

 I. 6. A right valve of the larger type-specimen, in same condition. 



-4,0. An enlarged portion of one of the same, to show the peculiar appearance sometimes pre- 

 sented by the surface of casts, retaining the thin inner layer of the shell, a little 

 abraded over the small projections, apparently representing spine-bases, in the fur- 

 rows between the costa;. [These little projections, however, should have been 

 darker instead of lighter than the surrounding spaces.] 



Fig. r>. Tiiracia subtortuosa •j-::'. 



An internal cast of the left valve of the type-specimen, showing the muscular and pallial 

 impressions. [The former, particularly the anterior scar, should In- pointed instead 

 of rounded above.] 



Fig. (1. Tiiracia ! Protjti 225 



i't.n. A dorsal view of the type-specimen, consisting of an internal east retaining portions of 



the shell. 

 6, b. A left-side view of same, showing the posterior muscular sear anil the sinuous pallial line. 



