1PM BN AW ID)» Seo OIE 
NUCULA "LEVATIFORME. .22 Sottses = So eee eee eee eee 
Fig.1. Right valve. 
la. Outline. Natural size. 
SCHIZODUS' PINTOENSIS ; -2%.5<< 50525 o5 5,52 = Se cfeds aos ane aoe eneesseins aaa = Sonena coeeetienee nee eee 
Figs. 2, 2a. Right and left valves. Natural size. 
SCHIZODUS CURTIFORME....-..-......- ABS S EM OBO OHO CO ODOO EDUC OOO SOEUR Om aCesaCSEE Secocsss 
Fig. 3. Right valve. Natural size. 
3a. Profile view of fig. 3. 
CARDIOLA T FILICOSTATA.§ 222.52 -\c55 20-0 eas sso ceene ences soe 
Fig. 4. Left valve, enlarged to two diameters. 
4a. Anterior view of fig. 4. 
SCHIZODUS DEPARCUSE oo seeeienee eines anes eeennennieee eet 
Fig. 5. Right valve. Natural size. 
5a. Posterior profile view of fig. 5. 
te ewe wees Beene woes wees cows cere 
Sta) ASTON .Y (6107 1 Oe Se eee a ere oSROn rs SOS SRO Aint Se a5. 505 CODbSn.Gocnne Cece cccrcacad cose os 
Fig. 6. Left valve. Natural size. 
11. A more transverse right valve. Natural size. 
MYVALINAU NEMESIS) 22 once )oenjenacieenciasa Celialescowalsamcecitene a saeae cen eae ate n eee eee 
Fig. 7. A right valve. Natural size. See plate xix, fig. 5. 
MVATINA NESSUS fee corc «cee elec einetalnm ene viecacjemeece sae ania ete nen seete adam ae ee ee aaa eee 
Fig. 8. A large right valve. 
da. A smaller right valve, showing the anterior margin. 
ISDMONDIA) 1) GIR COLARIS fers oete mee sete eee lee aia a ee le ee 
Fig. 9. Cast of left valve. Natural size. 
MYALIVA' (CONGENERIS = .cce- cece ace savseciesoresisseeseeseeee 
Fig. 10. Right value. Natural size. See plate xix, fig. 6. 
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