﻿1 144 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 127 



Page 

 Bromide formation (Pooleville member), cut on Oklahoma Highway 99, 

 3 miles south of Fittstown, Pontotoc County, Okla. 



I. Rostricellula orientalis (Billings) 642 



(61-64) Respectively side, posterior, brachial, and pedicle views of one of Billings 1 

 specimens, X 1, hypotype, G.S.C. 2184; (65) brachial view, X 2, of the same 

 specimen. 



Mingan formation, Harbor Island, Mingan Group, St. Lawrence River, 

 Canada. 



Plate 138 



Oxoplecia, Plectocamara, Rhynchotrema, Rostricellula 



A. Rhynchotrema increbescens (Hall) 628 



(1-5) Respectively anterior, posterior, side, brachial, and pedicle views, X I, of 

 the lectotype, A.M.N.H. 707/1 ; (6) brachial view, X 2, of the same specimen 

 showing slot of median septum; (7) posterior of the same, X 2, showing strong 

 dental plates and impression of cruralium. 



Trenton formation, Middleville, Little Falls (15') Quadrangle, N. Y. 



B. Oxoplecia costellata Cooper, new species 540 



(8, 9) Respectively anterior and brachial views of an imperfect specimen, X 1, 

 holotype, 117126. 



Whistle Creek formation, road cut on U. S. Highway 60, 100 yards southeast 

 of Whistle Creek, 2 miles northwest of Lexington, Lexington (15') Quadrangle, 

 Va. 



C. Rostricellula colei Cooper, new species 634 



(10-14) Respectively pedicle, brachial, side, posterior, and anterior views of a 

 nearly perfect specimen, X I, holotype, H72i6d; (15-19) respectively anterior, 

 posterior, pedicle, side, and brachial views of a younger specimen, X I, para- 

 type, 117216a; (20-24) respectively anterior, posterior, side, brachial, and pedicle 

 views of an obese specimen, X 1, paratype, 117216c Note small Acanthocrania 

 on tongue of pedicle valve. 



Decorah formation (Ion member), road cut on county road, 1.1 miles east of 

 U. S. Highway 52, south side of Cannon Falls, Goodhue County, Minn. 



D. Rostricellula acutiplicata Cooper, new species 630 



(25, 26) Pedicle and brachial views of a small specimen with deep sulcus, X 1, 

 paratype, 117212b; (29-32) respectively side, pedicle, anterior, and posterior 

 views, X 1, of the holotype, 117212a; (33) brachial view, X i|, of the holotype. 

 Prosser formation (Z y gospira bed), St. Paul, Minn. 

 (27, 28) Brachial and pedicle views of another small specimen, X 1, paratype. 

 117213b; (34-38) respectively anterior, posterior, side, brachial, and pedicle views 

 of a large, deeply sulcate individual, X r, paratype, 117213a. 



Prosser formation (Zy gospira bed), Warsaw, Goodhue County, Minn. 



E. Rostricellula ainsliei (N. H. Winchell) 631 



(39) View of the posterior slope of the brachial valve, X 4, showing granules on 

 shell, hypotype, 24866a. 



Decorah formation (Spechts Ferry member), Elmira, Olmstead County, Minn. 



F. Plectocamara costata Cooper, new species 598 



(40) Interior of the pedicle valve showing spondylium, X 5, paratype, 117943a; 



(41) interior of the brachial valve, showing cruralium, X 5, paratype, 117943b; 



(42) same enlarged to X 10 to show greater detail. 



Lower Ward Cove formation, % mile southwest of Mount Eager Church, 

 Powder Springs (T.V.A. 154-SW) Quadrangle, Tenn. 



G. Rhynchotrema zvisconsinense Fenton and Fenton 630 



(43-45) Interior of a pedicle valve respectively tilted to the side, from the poste- 



