12 Ged) be 
KUTORGENAWEROSEPEOLENDSIS 3.5 252 ois sniee enw cece ona celoa salsa Gadelecen/ncohocos Seeccceneeuces 
Fig. 1. Dorsal valve, enlarged to three diameters. 
la. Ventral valve equally enlarged. 
1b. Restored outline of the two valves united. 
STENOTHECAGELONGATA\ jw ocisicece sels ocjaiceceiscns Seawierae hiatal fatal alsin nisl Maiciaisietais ieiminl= cistaiaietaja aeons 
Fig. 2. Upper side, enlarged to three diameters. 
2a. Lateral view of the same specimen. 
LES CRU BRST GROIUN penne SS OSE ORS CED CIES BESCTO BA SOEE UEIO BOO SCH ECB CEE EOSE HEE soso St = 
Fig. 3. Ventral valve, showing the more ovate form. See plate xi, fig. 2. 
KU MORGIN AS WHIT MLE UDD cnsois<a/oa soe nto ceninte san oe cleus nl oeininaeelns als saa ece rice veces Gece cers 
Fig. 4. Ventral valve, with outline restored, enlarged to two diameters, 
4a. Dorsal valve, with outline of convexity below. Natural size. 
EROLOSPONGTASHENESTRA TAC OB) COL w cin leraiacine s sjoSeniacio ee sani be Wee cccane scan cescecesucss 
Figs. 5,5, b. Three forms of spicul#; 56 is the more unusual form. Natural size. 
SCENEDUAW ICONICAG soe of mee iatie e mince, cae oseisine nici cama tis wtna cle siecacdciewe obeys Seba wooed teectesses 
Fig. 6. Posterior view, showing the elevation; the slight groove is very much too strong, 
it is scarcely descernible on the specimen. 
KemORGINABSC TLE CLES re eeme tee e ape m eral sem me matenc ceeicmisiae)anneriise sane seseniaaceseinase ce 5a50 
Fig. 7. Dorsal va've, enlarged to six diameters. See plate i, figs. 7.7 a, b. 
(ORM SID) SOO ENE) Pane Jose Soa beccococe dSUe SU CC OS EU CESSES CHRO BEBE BS Boon OSS -CAbEoone oes 
Fig. 8. Dorsal valve, enlarged to three diameters. 
8a. Ventral valve, similarly enlarged and showing the cast of the muscular scars. 
ACROPREVACGEMMA, 225 Jaeenieacsacteasoce .caceulecwess secee < PH acoantEocne coco SSSear aSncsc! accor 
Fig. 9. Lateral view, enlarged to four diameters. 
9a. View from above of the same. See plate i, figs. 1 a-e, 
AGNOSTUS RICHMONDENSISE >. - -s---cle.co-ciese> cose eoee BaiRSE COOCOC QOE RES EONS CER COOO COU HOSES - 
Fig. 10. View of the cephalic shicld, enlarged to four diameters. 
AGRODAM LEE DLCHOTOM Ale sm cnaieeina mine nic cache sian ate min een ee oe eaiseee ces So0666 SE6a5¢ ——— 
Fig. 11. View of the specimen described, enlarged to three diameters. 
ODENEIGN GS SLDDING Siem sarjanteniants aries) acre celom = sacle ss esis See eee acne nedeceseccices saoadescg 
Fig. 12. View of the type specimen, enlarged to two diameters. 
A GNOSDT SEBUD ING manent forces ts alpanii es etree sicee ol selene oo aioe oe ace odes ome c ee waes 
Fig. 13. Cephalic shield, enlarged to four diameters, 
13a. Small caudal shield associated with the above, enlarged to five diameters. 
AGNOSRUSERECLUSUS a itten tarts eielomie ans arn ioee ss) eh eo ae ete sestaaa actos es aeeinwis(sivaniacs/ces's eecece 
Fig. 14. Cephalic shield, enlarged to four diameters. 
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