﻿IO48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I27 



Page 



B. Petrocrania ? magna Cooper, new species 289 



(6, 7) Brachial valve, side and exterior, X I, holotype, 109762. 



Effna formation, lower part of McNutt Quarry, 12 miles southwest of Bland, 

 Burkes Garden (15') Quadrangle, Va. 



C. Petrocrania ? sp. 2 290 



(8-10) Respectively interior, side, and exterior views of a silicified brachial valve, 

 X 2, figured specimen, 109770. 



Edinburg formation (base of Liberty Hall facies), 1.8 miles S. 4° W. of Bethel 

 Church, 5.9 miles due east of Harrisonburg, Harrisonburg (15') Quadrangle, 

 Va. 



D. Petrocrania halli ( Sardeson) 288 



(11) Brachial interior showing muscle scars, X 2, figured specimen, 24218a. 

 Decorah formation (Spechts Ferry member — Stictoporella bed), Lake Street 



Bridge, St. Paul-Minneapolis, Minn. 



(12) Another brachial valve, X 2, figured specimen, 45218a. 



Decorah formation (Ion member — Phylloporina bed), St. Paul, Minn. 



E. Petrocrania hamiltoniae (Hall) 288 



(13) Plasticine replica of the interior made from an impression of the brachial in- 

 terior showing muscle scars and pallial marks, X ii, figured specimen, 116834c; 

 (14) plasticine replica of the pedicle interior showing pallial and muscle marks 

 prepared from an interior impression, X I2, figured specimen, 116834b. 



Devonian, Ludlowville formation (Stone Mill member), at elevation of 1,265 

 feet on the road 1 mile southwest of Randallsville, Morrisville (15') Quadrangle, 

 N. Y. 



F. Petrocrania prona (Raymond) 289 



(15) Exterior of brachial valve, X 2, cotype, Carnegie Mus. 5441 ; (16) brachial 

 valve exterior, X I, figured hypotype, A.M.N.H. 25046/2; (18) brachial interior 

 showing large central muscle scars, X 2, cotype, Carnegie Mus. 5443; (17, 19) 

 brachial interior, X 2 and X I, cotype, Carnegie Mus. 5442. 



Chazy group (Crown Point), Valcour Island, Lake Champlain, Plattsburg 

 (15') Quadrangle, N. Y. 



G. Petrocrania sp. 3 291 



(20) Brachial interior, X 2, figured specimen, 109766a; (21, 22) side and exterior 

 views of the brachial valve, X 2, figured specimen, 109766b. 



Bromide formation (Mountain Lake member), deep well of Oklahoma Mid- 

 continent Petroleum Corporation, on Jones Farm, sec. 22, T. 5 N, R. 3 E., 

 Pottawatomie County, Okla. 



H. Petrocrania sp. 1 290 



(2^) Brachial interior, X 2, figured specimen, 109778. 



Dryden formation (30 feet above marble), road along Little Sycamore Creek, 

 \ mile northeast of west edge of the Howard Quarter (T.V.A. 162-NW) Quad- 

 rangle, Term. 



I. Petrocrania inflata Cooper, new species 288 



(24, 25) Side and exterior views of a brachial valve, X 2, paratype, 109767. 



Bromide formation (Pooleville member — Oxoplecia gouldi zone), Rock Cross- 

 ing of Hickory Creek, about center sec. 35, T. 5 S., R. 1 E., Criner Hills, Carter 

 County, Okla. 



J. Petrocrania inflata Cooper, new species 288 



(26, 33) Side and exterior views of a brachial valve attached to Strophomena 

 crinerensis, X 2, paratype, 109783c; (27, 32, 35) respectively side, exterior, and 

 posterior views of a robust brachial valve, X 2, holotype, 109785a; (31, 34) 

 brachial and side views of the holotype, X 1 ; (28-30) side, posterior, and exte- 



