PLATE XVII. 



Teredo Suciensis (pngc 135.) 



Kiglit valve. 



Portion of the shelly Uibo of an.ithcv specimen. 



MARTEsrA CLAUSA, Galjb (page loT.) 



Left valve of a perfect specimen. 



Dor.sal aspect of the same, to show the umbonal accessory plate. 

 Outline of ventral side of the same, showing the shape of tiie foot 

 opening. 



CoRBULA Traskii (?), Gabl) (page lo8.) 

 Figure 3. A right A'alve supposed to belong to this species. 



CoRuuLA MrxniA. D'Orbignj (page 138.) 



Figure 4. Ilight valve. 

 " 4 a. Ld^t ditto. 



Anatina suLCATiNA, SliuiTiUrd (page 139.) 



Figure ;">. Right vah^e of a largo and nearly perfect individual. 

 " 5 a. Left valve of another specimen. 



Periploma s[ti}oub[culatl'.m (page 138.) 



Figure G. Right valve of the type of this species 



TiiRAciA suBTRUNCATA, Mcck (page 140.) 



Figure 7. A left valve with the posterior extremity imperfect. 



Cyjmbopiiura AsiiBURXERii, Gabb (]nige 141.) 



Figure 8. Left valve of a specimen of the ribbed variety of this species. 



Mactra (Cymbopiiora?) AV'arrexana, Meek & llaydcu (page 142.) 



Figure 9, Left A'alve of an average example. The concentric striations of the sur- 

 face are far too coarse, and, as the figure does not give a very good 

 idea of the true sculpture of the .shell, two additional illustiatious 

 of the species are given on plate ID. 



Tellixa ((Ene) 8p. uiult. (i)age 143.) 

 Figure 10. Left valve of a small specimen. 



Tellina (Peuon.ea) occiDENTAins, Meeic, Sj). (page 144) 



Figure 11. Left valve, with the test preserved. 



" 11 a. Cast of a left valve, showing the muscular impressions and the deep 

 pallial sinus. 



Linearia !Sucien.sis (jiage 140.) 



Figure 12. Riglit valve of the only specimi-n collected. 



Cytiierea (Callista) l.vcinlvta. St.)!iez!<a (page 148.) 



Figure 13. Left valve. 



•' 13 «. Outline of a cast of another left valve. showing the muscular impn^ssions 

 and i)allial sinus. 



Cytiierea (Caryatis) plana, iSowc^;.;, j 'op. (i, t-'go 149.) 



Figure 14. Right valve of a medium sized examj;Io. 

 " 1 4 «. Right A'alve of a smaller specimen. 

 " 14 b. Interior of the last, showing the hinge teeth. 



Cyprimeria lens, Gabb, .Sp. (page 153) 



Figure 15. Left valve of a variety of this species. 



" 15 a. I'ortion of interior of another left valve, showing the hinge t'ctli. 



