PLATE XI—Continued. 
TRELLINOMY A: CONTRAGTAM ac leciet fice eleeieinals Sala ome sea ce ie ciaea = atahaiaie ata einisle eee om area aaa itor 
Fig. 15. Left valve, enlarged to two diameters. 
15a. Interior of a smaller specimen. 
HYOLITHES: VANUXEMD)< sc oo ce wcicene tcimcsorinsicl ste wisioesleae ot ooatese nineteen nie raceeee een matane 
Figs. 16, 16a. Views of the ventral and dorsal sides, enlarged to two diameters. 
16b. Transverse section of the tube. 
COTE OER TON CEN WD Ae ere en eel te eee 
Figs. 17, 17a, Lateral views of a straight and slightly curved tube, enlarged to four diam- 
eters. See plate xii, fig. 21. 
MACELUREA. SUBANNULATAG so rccin a ecient tas eraare te =) ola ate tal etctatad nistaia tate elo iate itor Teataie lee a eat eae arti oe abate 
Fig. 18. View of the upper side, showing the depressed character of the spire and the an- 
nulations on the cast of the outer whorl. 
18a. View of the lower side of the same specimen. 
18b. Section of the outer whorl. 
MU Nop y op WA ONGOING Cho coos bncbonos SoCo Sops> Coos DIoDEO Eoccor Saasioe HSsassSoscos cosseesc 
Fig. 19. View of the lower side, showing the annulations of the outer surface of the shell, 
enlarged to two diameters. 
19a. Internal cast of the lower side, similarly enlarged. 
MACLUREA OARINATA sence cise ete eaten SOR ROU CEOS SanO HO COES CaO a SEER OcOSonae Saco aceneecae 
Fig. 20. View of the lower side, showing the strong surface striz. 
20a. Cast of the lower side. 
RAPHISTOMA™ NASON metesie ele ete ata a ce aya malate atin tele = flatts ale eee tlm l= mole elated etait le mth atelnlet 
Figs. 21, 21a. Lateral and summit view of small specimen. 
PLEUROTOMARIA LONENSIS..-<-. ------ 202-00 ences cone conn coerce cove wane cane nance scncesas= 
Fig. 22. Lateral view of the specimen from Lone Mountain. Natural size. 
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