127) CyeN G01) Oe 
TELLINOMYA ? HAMBURGENSIS .. .----- = ec cce cece cone cone cone cece nn wean nn cone wacc es cece ence 
Fig. 1. Left valve, enlarged to two diameters, to show the fine surface stria. 
la. Same valve, showing the posterior margin more depressed, which is the usual form 
of the species, enlarged to two diameters. 
THOS (CORDA | NUS PO COU TO Woe An BSS S585 p55 doce Slee DESC ED Go OS. o 5 CHEB OBS D SOB DEB eOBO OOOO 000000 Cood 
Fig. 2. A specimen of the broad variety of the species, from which the outer surface is 
exfoliated, enlarged to two diameters. See plate ix, fig. 3. 
(Orit ynol VAM = ce5 edd SeSe SHED ESO 6 SSUES EE BOCES OSS Con OST acea pene podesoornectspenscr 
Figs. 3, 3a, 3b. Dorsal, ventral, and lateral views of a characteristic specimen, enlarged to 
two diameters. 
ORTHISCER IC ENA UAW a aetee ota sereeieteeie esc oisinio nia sleislodee es sleine ere mnlateistelesmiastwini=tai=inlaiairi<in'=is= 
Figs. 4, 4a. Ventral and dorsal views, showing the strong radiating coste and form of the 
valves, enlarged to two diameters. 
ORDUBISUELAMBURGENSIS) 22 <2 eee 3c oe cis etecioe eaten le einieole je =icla civ ave wleiwie wie senleiwinin, ain alninininiacisisin'e 
Fig.5. Ventral valve, enlarged to three diameters to show the fissicostate plications and 
general form of the valve. 
5a. Same, of the dorsal valve. 
ORTHISUDONENSIS coats nate os sie ee oon cereice cise wie iels slo cielociu aciom seewipclewa.c os -snclcms'ecmscicne nse 
Fig.6 Ventral view and outline of the convexity of the ventral valve. Natural size. 
6a. View of the area, showing the triangular-shaped foramen. 
IP RIPERAPATCALOINE RAG M aa en nec cricisisacicicicisisceisaccie wastes sicfascictecelsleie's lanier cielvininl= «== nseloaisia 
Fig. 7. Ventral valve, enlarged to two diameters. 
8. Ventral valve of this or an allied species. The valve is convex and the median fold 
rounded. 
STREPTORHYNCHUS MINOR... < .-. 2.2.00 205222 - <5 20 nen ceo ence co ce cn ne on enn ns =n o= monn ocr nner 
Fig. 9. Ventral valve, enlarged to two diameters. 
ORTHIS TESTUDINARIA...---. .----- e222 22 once ee cere ne cece cece ee cee n ne tances ceceen ce cece a 
Fig. 10. Ventral valve. The cardinal angles are more rounded in the specimen. 
10a. Dorsal valve a little enlarged. 
RECEPTACULITES MAMMILLARIS- .... .----- -2-20- coe- cece ne eens cece ee cece ee ence eee saceances 
Fig. 11. View looking on the base of a small specimen. 
RECEPTACULITES ELLIPTICUS ....------ 20+ ----0+ cee e ne cone coon ee ennee apres ossSsocoscesses = 
Fig. 12. Lateral view. 
MODIOLOPSIS POGONIPENSIS .-.--- ---- +--+ + eee ene 22 = ween ce enn cece ne cen ee ee cece ee eees = 
Fig. 13. View of the left valve enlarged to two diameters. See plate i, fig. 6. 
MODIOLOPSIS OCCIDENS ..-. - ---- - 0-20 ee 2 ene cee ene ne ce ene cee ce en nn cee ne cee e cee ens tee neeee 
Fig. 14. Outline of a large right valve, as seen on a weathered surface of rock. 
14a. Smaller right valve, showing the exterior form. Natural size. See plate i, fig. 5. 
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