66 



schlotheimi at the time of preparioff this plate, as the two 

 shells are not dissimilar externally. Or he may have in- 

 tended to represent T. schlotheimi^ and failed to do so suffi- 

 ciently to allow his figure to be distinguished from R.for- 

 mosa. Any one familiar with Mr. Conrad's plates will not 

 doubt the possibility of this. But there does not appear 

 to be any certain method of deciding that there was any 

 necessary connection between this figure and the "common 

 Silurian bivalve" which Mr. Conrad had in his mind when 

 he proposed his genus, and with which his diagnosis agrees. 

 The fact that the same species was afterward made the type 

 of the genus Camerophoria by Professor King has no bear- 

 ing on the question. 



To the writer there seems no escape from the necessity of 

 taking Mr. Conrad's citation as it stands, and thus conform- 

 ing to the rules of nomenclature, although in so doing we 

 shall be obliged to reduce to the rank of a synonyme a name 

 which has been widely recognized and generally adopted. 



StenocflSBMa, Hall. Atrypidcc. 1 847. 



, Pal. N. York, i, p. 142, pi. 33, f. 15. Type Atrijpa modesta, Say ; Hall 

 1. c. (Trenton Gr.). Scr. Stenoschisma ; not Stenocisma, Conrad, 1839, nor 

 Hall, 1867. {— Zygospira, Hall.) 



^teniocflsina, Hall. RhynchonelUdw. 1867. 



Pal. N. York, iv, p. 334. Type EhynchoneUa formosa, Hall, Pal. N. Y. 

 iii, p. 236, pi. 35, f. 6 a-y (L. Held.). Scr. Stenoschisma, not Stenocisma, 

 Hall, 1847. {Com]}. Bhynchonella, Fisch.) 



^tola, Klein. Invertehrata. 1 753. 



Ostracol. p. 173, non-binomial, pi. xii, f. 82-86. Gen. cont. Cliama sp. 

 Brachiopoda sp. Name cited Spondyli Listeriana, Klein, 1. c. incl. several 

 things. 



Stophalosia, Bronn. Froductidcc. 1848. 



Leonh. u. Bronn, Jalirb. f. Min. p. 248; lapsus, = -S/rojjfiaZosia, King. 



Sf replaeodoBita, Marschall. Strophomenidw. 1873. 



Nom. Zool. p. 140 ; lapsus, = Strophodonta, Hall. 



Streptorhynclms, King. Strophomenidw. 1 850. 



Mon. Perm. Foss. p. 107 (Garb, and Perm.). Type Terebratulites pelar- 

 gonaius, Schloth. Denkschr. Acad. MUnchen. vi, t. 8, f. 21-23. Dav. 1856, 

 pi. xi, f. 27. Dav. Mon. Perm. Brach. ii, f. 33, 40-42. (See Remipronites, 

 P.) 



