Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . natural size. Fig. 2. Pteria (Pseudoptera) propleura 281 a. Left valve of young example; front margin not quite perfect. b. Left valve of a somewhat larger example. c. Left valve of adult example; drawn from a gutta-percha cast of the sandstone mould of Mr. Meeks type-specimen of hisAvicula {Pseudoptera) rlrytopl\ora\ Fig. 3. Baroda wyomingensis , ,. 293 a. Left valve; natural size. b. Dorsal view of
Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . natural size. Fig. 2. Pteria (Pseudoptera) propleura 281 a. Left valve of young example; front margin not quite perfect. b. Left valve of a somewhat larger example. c. Left valve of adult example; drawn from a gutta-percha cast of the sandstone mould of Mr. Meeks type-specimen of hisAvicula {Pseudoptera) rlrytopl\ora\ Fig. 3. Baroda wyomingensis , ,. 293 a. Left valve; natural size. b. Dorsal view of the same example. Fig. 4. Baroda subelliptica 294 a. Lateral view; left valve; natural size. b. Dorsal view of the same, showing dorsal aspect of the teeth. c. Right side view of a smaller Dorsal view of the same. Fig. 5. Trapezium micronema ,.. -. 293 a. Left side view; natural size. Fig. 6. Trapezium truncatum 292 a. Left side view; natural size. b. Dorsal view of the same specimen. Fig. 7. Oyrena inplexa 290 a. Lateral view; right valve; natural size. b. Natural cast of right valve, showing muscular impressions and pallia! line and sinus. LIS : :-i-OGIC/\L SURVEY PLATE ,:-r; - - f ^§fe- 4 ? . -? .
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