NO. 2 BRACHIOPOD SUPERFAMILY STENOSCISMATACEA — GRANT I43 



Stenoscisma with Conrad's original spelling. Since then most authors 

 have used the name in this manner for species related to S. schlotheimi; 

 examples are Stehli (1954) ; Fagerstrom (1961) ; Shaw (1962) ; and 

 Easton (1962). 



A few authors have preferred to retain the name Camerophoria (or 

 its variant spelling) for the group related to 5\ schlotheimi. Sarycheva 

 and Sokolskaya (1952, p. 170) used Camarophoria, and dated it from 

 King's nomen nudum of 1844 when he had spelled it Camerophoria. 

 Dunbar (1955, p. 119) noted Conrad's mistaken interpretation of S. 

 schlotheimi, and cited opinions of the International Commission on 

 Zoological Nomenclature as justification for continued use of Camero- 

 phoria. He indicated intent to appeal for a ruling to retain the name, 

 but no such appeal has been received by the Commission (Spillane, 

 written communication, 1961). No further attempts to retain King's 

 name have been made : current usage recognizes its objective synonym- 

 ity with Stenoscisma. Licharev (1960) in the Russian treatise on 

 brachiopods, Osnovi Paleontologii, uses Stenoscisma with Conrad's 

 original spelling, and the Treatise on Invertebrate Paleontology 

 (Moore, ed.) will employ Stenoscisma similarly. 



Range. — The range of Stenoscisma begins in the Lower Carbonifer- 

 ous of England and the nearby Continent with 6". crumenum (Martin) 

 (see Davidson, 1858). It is very rare in the Pennsylvanian, (Upper 

 Carboniferous) but is abundant throughout the Permian. 



STENOSCISMA SCHLOTHEIMI (von Buch) 



Plate 21, figs. 1-12; figure 34 



Terebratula schlotheimii VON BUCH, 1835, p. 59, pi. 2, figs. 32a-c. 



Stenoscisma schlotheimii (von Buch) CONRAD, 1839, p. 59. 



Camerophoria schlotheimi (von Buch) KING, W., 1846, p. 89. 



Camarophoria schlotheimi (von Buch) KING, W., 1850, p. 113, pi. 7, figs. 10-21. 



Shell outline subtrigonal to subpentagonal, commonly transverse, 

 some specimens slightly elongate, larger specimens normally propor- 

 tionately wider, greatest width anterior to midlength ; convexity mod- 

 erate, greatest swelling in brachial valve; commissure strongly and 

 narrowly uniplicate ; fold beginning 3-6 mm. anterior to brachial beak, 

 standing increasingly high above flanks, crest arched, less commonly 

 flattened ; sulcus strongly depressed toward anterior, extending as long 

 tongue into arch of fold ; posterolateral edges of valves strongly over- 

 lapping, edges from midlength forward butting; stolidium present on 

 adults longer than 10 mm. extending from both valves at crest of fold 

 and trough of sulcus, normally extending from pedicle valve at antero- 

 lateral extremities, also present there on brachial valve of many sped- 



