Pe apACan taiaeale 
Mosstsovicsta, BucHicERAs, ROEMEROCERAS. 
EGS: — Bee MLO]STSOULCS UC GLU, CUCL UNS Le LIC aA Tn paleo Pe 
Specimens from Pariatambo, Peru; Albian? (after Steinmann). 
ERT S¥e4—O MBB UUGMACETOSKOLLO OCLLLIT lel ay cus Ue ae tr 
Figs. 4, 5. Natural size. 
6. Enlarged, showing costee and aspect of center. 
7. Front view of center of fig. 6. 
8. Suture from outer volution, part broken off in fig. 6, < 3. 
9. Suture of young « 10 when the cost begin to appear. 
Cachiyacu, Peru; Upper Cretaceous; my collection. 
EG Sel OIA RO een OCenGsysy i CLG O TILE Lay el tier eee ee 
Fig. 10. Aged specimen. 
11. Suture of same? 
12. Younger stage of another specimen, all natural size. 
13. Suture of same, right side, * 3. 
14. Suture of same, left side, * 3. 
Cajamarca, Peru; Upper Cretaceous; my collection. 
Fie. 15. Roemeroceras attenuatum (Hyatt) .........---- teaser are IST e See iN aS Fee STS ea 
Fig. 15. Suture, natural size. The second lateral saddle has, by an oversight on 
the author’s part, been drawn too decidedly as trifid. It is really a bifid 
base with a prominent outer marginal and much like the same saddle in 
fig. 13. 
Celendin, Peru; Upper Cretaceous; my coilection. 
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