﻿IIl6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 



Page 

 Yellow limestone on 25-foot sandstone at base of Eureka group, 3i miles 

 N. 17° E. of Martin Ranch, Roberts Mountains (i°) Quadrangle, Nev. 



H. Porambonites ? sp. 1 609 



(40, 41) Exterior and interior of the pedicle valve, X I, showing spondylium and 

 short septum, figured specimen, 117177; (42) exterior of the same specimen, 

 X 2, showing pitted ornamentation. 



Pogonip group, hills on the west side of Racetrack Valley, opposite Quartz 

 Spring, Uhebe Peak (15') Quadrangle, Inyo County, Calif. 



I. Oxoplecia magnaplicata Cooper, new species 546 



(43-47) Respectively brachial, anterior, posterior, pedicle, and side views of an 

 adult complete specimen, X I, holotype, 117109; (48) brachial view of the pre- 

 ceding specimen, X 2, showing interarea and small ridge on pseudodeltidium. 



Shippensburg formation (Pinesburg member — Echinosphaerites zone), cut 

 at Wilson on U. S. Highway 40 on the west side of Conococheague Creek, 

 7 miles west of Hagerstown, Williamsport (15') Quadrangle, Md. 



Plate 109 

 Camerella, Idiostrophia, Rhysostrophia 



A. Idiostrophia perjecta Ulrich and Cooper 589 



(1-3) Respectively brachial, side, and pedicle views of a small specimen referred 

 to this species, X 2, hypotype, 117173. 



Table Head series (middle to upper half), 22 to 3 miles south of Belle 

 Burns, Newfoundland. 

 (4-8) Respectively posterior, anterior, side, pedicle, and brachial views of a fine, 

 large specimen, X ii, holotype, 92885a. 



Boulder in Mystic conglomerate, Range 6, Lot 20, Stanbridge Township, near 

 Mystic, Quebec, Canada. 



B. Idiostrophia costata Ulrich and Cooper 588 



(9-13) Respectively pedicle, anterior, side, posterior, and brachial views of a com- 

 plete specimen, X ii» holotype, 92886. 



Horizon and locality same as preceding (figs. 4-8). 



C. Idiostrophia plicata Cooper, new species 589 



(14-17) Respectively brachial, anterior, pedicle, and side views, X 2, of the 

 holotype, 117172. 

 Table Head series, Table Point, Newfoundland. 



D. Idiostrophia paucicostata Cooper, new species 588 



(18-20) Respectively pedicle, side, and brachial views of sparsely plicated indi- 

 vidual, X 2, holotype, 117171. 



Upper Pogonip group (sponge beds), Ikes Canyon, about f mile above the 

 mouth, Toquima Range, Roberts Mountains (i°) Quadrangle, Nev. 



E. Idiostrophia nuda Cooper, new species 588 



(21-25) Respectively brachial, pedicle, posterior, anterior, and side views, X I, of 

 the holotype, 117170; (26-29) respectively posterior, anterior, pedicle, and side 

 views of the holotype, X 2, showing the ornamentation. 



Pogonip group (mottled zone 700 feet below the Eureka quartzite), base of 

 the first ridge east of Frenchman Flat, Las Vegas (i°) Quadrangle, Nev. 



F. Rhysostrophia transversa Ulrich and Cooper 559 



(30, 31) Exterior of pedicle and brachial valves, X 2, respectively lectotype, 

 91175b, and paratype, 91175a. 



Mystic conglomerate, Range 6, Lot 20, Stanbridge Township, near Mystic, 

 Quebec, Canada. 



