' Wl!" J PK<XEKDIXG.S OF THK NATIONAL ML'8Kr.M. .U 1 



of ribs varirs from iwtMity to twrrity tivf, Tlu» (\ littivoMfalmn .Sl»y. aiitl 

 tin' ('. /''(/i<i>/i/-iMf (if tlu*Haiii«* author, ail' |ii'ol)al»ly partially ^mwii illiis 

 tratioiiH of this .H|MM'i«'s, iis siigi^esteil by Cai|H'iit«'r in his Mazatlun cula* 

 lojiut'. 



28 Cardiuiu ' Frafjiim I obovalo siiy. 

 Olio valve. 

 Hahia. 



29 C.iidium Hemicardium) planicostatum Sby. 



Oiltl valves. 

 I'aNta; Maiita. 



This form is very close to the more northern hianyiilatum of tin- saiiio 

 author. 



30. Cryptogramma subrugosa Shy. 



= JHumttlocardia »uhrugu»a Sby. 



Perfect examples ami >iil.l valves. 

 Panama. 



31 Ciyptogramma subimbricata st.v 



.Inomnlncarditi Kiihimbficatu ^\>\ . 



< )<|il \al\ es. 



K.iliia; Payta. 



Dr. .Foiies ai>pareiitly faile«l to detect the lirst named of this ^^eiius 

 .south of I'anama, thou;:h d'Orbi^^ny credits it to Pern ; ('. suhimhrioitit, 

 however, he fouiil at points farther .south than before reported. They 

 txjth reach north to the (iulf «)f California. 



« )iie valve, 

 n.ihia. 



One valve, 

 nahia. 



32 Callista conciniia Sdv. 



33. Callista ciiciuata H<>rii. 



34 CiUista circiuata Horn, varit-ty, 



One valve only {Mii.>. No. is.') 47). 

 Payta. 



35 VenuM Chioiie) columbicnsi* Sliy. • 



Odd valves. 



P.UMsiiiayo; Payta. 



The ;,'eneral facies of this form is .sujjjfestive of tli«* Tapes (L'uiieus) 

 fjroupso abundantly repiasenfed on the west coast, tlioiinh the heavy 

 liiii;;e line, teeth, ami muscular scars indicate its place with (Jhinne. I )r. 

 Jones's localities carry this s|H»cies farther south than befon* repoited. 



